tioga county, pa

Transcription

tioga county, pa

VOLUME 1 OF 2
TIOGA COUNTY,
PENNSYLVANIA
(ALL JURISDICTIONS)
COMMUNITY NAME
COMMUNITY
NUMBER
BLOSS, TOWNSHIP OF
BLOSSBURG, BOROUGH OF
BROOKFIELD, TOWNSHIP OF
CHARLESTON, TOWNSHIP OF
CHATHAM, TOWNSHIP OF
CLYMER, TOWNSHIP OF
COVINGTON, TOWNSHIP OF
DEERFIELD, TOWNSHIP OF
DELMAR, TOWNSHIP OF
DUNCAN, TOWNSHIP OF
ELK, TOWNSHIP OF
ELKLAND, BOROUGH OF
FARMINGTON, TOWNSHIP OF
GAINES, TOWNSHIP OF
HAMILTON, TOWNSHIP OF
JACKSON, TOWNSHIP OF
KNOXVILLE, BOROUGH OF
LAWRENCE, TOWNSHIP OF
LAWRENCEVILLE, BOROUGH OF
LIBERTY, BOROUGH OF
LIBERTY, TOWNSHIP OF
422094
420817
421171
421172
421173
421174
421175
421176
421177
422095
421154
420818
422097
421005
421178
420820
420819
421006
420821
420822
422098
COMMUNITY NAME
MANSFIELD, BOROUGH OF
MIDDLEBURY, TOWNSHIP OF
MORRIS, TOWNSHIP OF
NELSON, TOWNSHIP OF
OSCEOLA, TOWNSHIP OF
PUTNAM, TOWNSHIP OF
RICHMOND, TOWNSHIP OF
ROSEVILLE, BOROUGH OF
RUTLAND, TOWNSHIP OF
SHIPPEN, TOWNSHIP OF
SULLIVAN, TOWNSHIP OF
TIOGA, BOROUGH OF
TIOGA, TOWNSHIP OF
UNION, TOWNSHIP OF
WARD, TOWNSHIP OF
WELLSBORO, BOROUGH OF
WESTFIELD, BOROUGH OF
WESTFIELD, TOWNSHIP OF
COMMUNITY
NUMBER
420823
421179
421155
421181
421182
420824
420825
420826
422099
422100
421183
420827
420828
421184
422101
420829
422093
421185
PRELIMINARY:
MAY 28, 2010
Federal Emergency Management Agency
FLOOD INSURANCE STUDY NUMBER
42117CV001A
NOTICE TO
FLOOD INSURANCE STUDY USERS
Communities participating in the National Flood Insurance Program have established
repositories of flood hazard data for floodplain management and flood insurance purposes.
This Flood Insurance Study (FIS) may not contain all data available within the Community
Map Repository. Please contact the Community Map Repository for any additional data.
The Federal Emergency Management Agency (FEMA) may revise and republish part or all
of this FIS at any time. In addition, FEMA may revise part of this FIS Report by the Letter
of Map Revision process, which does not involve republication or redistribution of the FIS
report. Therefore, users should consult with community officials and check the Community
Map Repository to obtain the most current FIS report components.
Selected Flood Insurance Rate Map panels for the community contain information that was
previously shown separately on the corresponding Flood Boundary and Floodway Map
panels (e.g. floodway boundaries, cross sections). In addition, former flood hazard zone
designations have been changed as shown:
Old Zone
A1 through A30
B
C
New Zone
AE
X
X
Initial Countywide FIS Effective Date: To Be Determined
TABLE OF CONTENTS – Volume 1
Page
1.0
2.0
3.0
4.0
INTRODUCTION ................................................................................................................... 1
1.1
Purpose of Study ............................................................................................... 1
1.2
Authority and Acknowledgments ..................................................................... 1
1.3
Coordination ..................................................................................................... 5
AREA STUDIED ..................................................................................................................... 6
2.1
Scope of Study .................................................................................................. 6
2.2
Community Description .................................................................................... 7
2.3
Principal Flood Problems .................................................................................. 8
2.4
Flood Protection Measures ............................................................................... 9
ENGINEERING METHODS ............................................................................................... 10
3.1
Hydrologic Analyses ....................................................................................... 11
3.2
Hydraulic Analyses ......................................................................................... 17
3.3
Vertical Datum ................................................................................................ 22
FLOODPLAIN MANAGEMENT APPLICATIONS ........................................................ 24
4.1
Floodplain Boundaries .................................................................................... 24
4.2
Floodways ....................................................................................................... 25
5.0
INSURANCE APPLICATIONS .......................................................................................... 47
6.0
FLOOD INSURANCE RATE MAP .................................................................................... 48
7.0
OTHER STUDIES ................................................................................................................ 49
8.0
LOCATION OF DATA ........................................................................................................ 49
9.0
BIBLIOGRAPHY AND REFERENCES ............................................................................ 49
i
TABLE OF CONTENTS – Volume 1 – (continued)
FIGURES
Page
Figure 1 – Floodway Schematic .............................................................................................. 26
TABLES
Page
Table 1 - Initial and Final CCO Meetings ................................................................................. 5
Table 2 – Streams Studied by Detailed Methods ....................................................................... 6
Table 3 – Stream Name Changes ............................................................................................ 6-7
Table 4 – Summary of Discharges ...................................................................................... 13-17
Table 5 – Manning’s “n” Values ............................................................................................. 21
Table 6 – Vertical Datum Conversion Values .................................................................... 23-24
Table 7 - Floodway Data..................................................................................................... 27-46
Table 8 – Community Map History .................................................................................... 50-52
EXHIBITS
Exhibit 1 – Flood Profiles
Panels 01P – 06P
Panels 07P – 13P
Panels 14P – 16P
Panels 17P – 20P
Panels 21P – 23P
Panel 24P
Panels 25P – 27P
Panels 28P – 29P
Panels 30P – 34P
Panels 35P – 37P
Panels 38P – 39P
Panels 40P – 42P
Alder Run
Babb Creek
Bear Creek No. 1
Bentley Creek
Boyden Brook
Camp Brook Creek
Charleston Creek
Cowanesque River Reach 1
Crooked Creek
East Branch Stony Fork
Elkhorn Creek
ii
TABLE OF CONTENTS – Volume 2
EXHIBITS – (continued)
Exhibit 1 – Flood Profiles – (continued)
Hammond Creek
Harrison Run
Harts Creek
Hoover Brook
Johnson Creek
Kelsey Creek
Kizer Creek
Long Run No. 1
Marsh Creek
Mill Creek No. 1
Mitchell Creek
Morris Branch
North Run No. 1
Painter Run No. 1
Phoenix Run
Pine Creek
Smith Creek
Tioga River Reach 1
Tioga River Reach 2
Tributary No. 1 to Charleston Creek
Wilson Creek
Exhibit 2 – Flood Insurance Rate Map Index
Flood Insurance Rate Map
iii
Panels 43P – 51P
Panels 52P – 54P
Panels 55P – 59P
Panels 60P – 67P
Panel 68P
Panels 69P – 72P
Panel 73P
Panels 74P – 75P
Panels 76P – 79P
Panels 80P – 83P
Panels 84P – 86P
Panels 87P – 91P
Panels 92P – 95P
Panels 96P – 98P
Panels 99P – 100P
Panels 101P – 109P
Panel 127P
FLOOD INSURANCE STUDY
TIOGA COUNTY, PENNSYLVANIA (ALL JURISDICTIONS)
1.0
INTRODUCTION
1.1
Purpose of Study
This countywide Flood Insurance Study (FIS) revises and updates information on the
existence and severity of flood hazards in the geographic area of Tioga County,
Pennsylvania, including the Boroughs of Blossburg, Elkland, Knoxville,
Lawrenceville, Liberty, Mansfield, Roseville, Tioga, Wellsboro and Westfield; and
the Townships of Bloss, Brookfield, Charleston, Chatham, Clymer, Covington,
Deerfield, Delmar, Duncan, Elk, Farmington, Gaines, Hamilton, Jackson, Lawrence,
Liberty, Middlebury, Morris, Nelson, Osceola, Putnam, Richmond, Rutland, Shippen,
Sullivan, Tioga, Union, Ward and Westfield (referred to collectively herein as Tioga
County), and aids in the administration of the National Flood Insurance Act of 1968
and the Flood Disaster Protection Act of 1973. This study has developed flood-risk
data for various areas of the county that will establish actuarial flood insurance rates
and to assist the county in its efforts to promote sound floodplain management.
Minimum floodplain management requirements for participation in the National
Flood Insurance Program (NFIP) are set forth in the Code of Federal Regulations at
44 CFR, 60.3.
The community formerly known as Township of Elkland was merged with the
Township of Nelson on January 1, 1992.
In some states and communities, floodplain management criteria or regulations may
exist that are more restrictive or comprehensive than the minimum Federal
requirements. In such cases the more restrictive criteria takes precedence and the
State (or other jurisdictional agency) will be able to explain them.
1.2
Authority and Acknowledgments
The source of authority for this FIS is the National Flood Insurance Act of 1968 and
the Flood Disaster Protection Act of 1973.
This FIS was prepared to include the incorporated communities within Tioga County
in a countywide format. Information on the authority and acknowledgements for
each jurisdiction included in this countywide FIS, as compiled from their previously
printed FIS reports is shown below.
1
Blossburg, Borough of:
For the FIS dated January 1980 and the Flood
Insurance Rate Map (FIRM) dated July 16, 1980,
the hydrologic and hydraulic analyses for this
study were performed by the Natural Resources
Conservation Service (NRCS), formerly known
as the Soil Conservation Service, for the Federal
Insurance
Administration
(FIA),
under
Inter-Agency Agreement No. IAA-H-9-76,
Project Order No. 9536. This work was
completed in June 1977 (Reference 1).
Covington, Township of:
For the FIS dated January 1980 and the FIRM
dated July 16, 1980, the hydrologic and
hydraulic analyses were performed by the NRCS
for the FIA, under Inter-Agency Agreement No.
IAA-H-9-76, Project Order No. 9511. This work
was completed in June 1977 (Reference 2).
Delmar, Township of:
For the FIS dated August 15, 1990 and the FIRM
dated August 15, 1990, the hydrologic and
hydraulic analyses for East Branch Stony Fork
study were prepared by the U. S. Geological
Survey (USGS) for the Federal Emergency
Management
Agency
(FEMA),
under
Inter-Agency Agreement No. EMW-85-E-1823,
Project Order No. 17. This work was completed
in July 1987. The hydrologic and hydraulic
analyses for Marsh Creek were prepared by
Gannett, Fleming, Corddry and Carpenter, Inc.,
for FEMA, under Contract No. H-3813, during
the preparation of the Flood Insurance Study for
the Borough of Wellsboro, Pennsylvania. This
work was completed in July 1977 (Reference 3).
Elkland, Borough of:
For the FIS and FIRM dated September 28,
1990, the hydrologic and hydraulic analyses
were prepared by the USGS for FEMA, under
Inter-Agency Agreement No. EMW-85-E-1823,
Project Order No. 17. This work was completed
in June 1988 (Reference 4).
Elkland, Township of (now
known as Township of Nelson):
For the FIS and FIRM dated April 1, 1986, the
hydrologic and hydraulic analyses were prepared
for FEMA. For the FIS and FIRM dated
November 2, 1990, the hydrologic and hydraulic
analyses were prepared by the USGS for FEMA.
This work was completed in June 1988
(Reference 5).
2
Gaines, Township of:
For the FIS dated March 1978 and the FIRM
dated October 16, 1984, the hydrologic and
hydraulic analyses were performed by Gannett,
Fleming, Corddry and Carpenter, Inc. for the
FIA, under Contract No. H-3813. This work was
completed in February 1977 (Reference 6).
Jackson, Township of:
dated September 1, 1978, the hydrologic and
Fleming, Corddry and Carpenter, Inc., for the
completed in April 1977 (Reference 7).
Lawrence, Township of:
hydraulic analyses were performed by Erdman,
Anthony and Associates for the FIA, under
Contract No. H-4501. This work was completed
in March 1979 (Reference 8).
Lawrenceville, Borough of:
For the FIS dated February 1980 and the FIRM
Anthony and Associates for the FIA, under
Morris, Township of:
hydraulic analyses were performed by Gilbert
Associates, Inc., for the FIA, under Contract No.
H-4557. This work was completed in January
1979 (Reference 10).
Osceola, Township of:
For the FIS and FIRM dated August 19, 1991,
the hydrologic and hydraulic analyses were
prepared by GEO-Technical Services, Inc. for
FEMA, under Contract No. EMW-88-C-2624.
This work was completed in November 1989
(Reference 11).
Putnam, Township of:
dated July 2, 1980, the hydrologic and hydraulic
analyses were performed by NRCS for the FIA,
under
Inter-Agency
Agreement
No.
IAA-H-9-76, Project Order No. 9546. This work
was completed in June 1977 (Reference 12).
3
Richmond, Township of:
dated July 2, 1980, the hydrologic and hydraulic
analyses for this study were performed by the
NRCS for the FIA, under Inter-Agency
Agreement No. IAA-H-9-76, Project Order No.
9541. This work was completed in June 1977
(Reference 13).
Tioga, Township of:
For the FIS dated February 1980 and the FIRM
Anthony and Associates, for the FIA, under
Wellsboro, Borough of:
For the FIS dated October 15, 1980 and the
FIRM dated April 15, 1981, the hydrologic and
Fleming, Corddry and Carpenter, Inc., for the
completed in July 1977. All survey work was
done by, or under the direction of, Aero
Services, under subcontract to Gannett, Fleming,
Corddry and Carpenter, Inc (Reference 15).
FIS reports were not published for the Boroughs of Knoxville, Liberty, Mansfield,
Roseville, Tioga and Westfield; and the Townships of Bloss, Brookfield, Charleston,
Chatham, Clymer, Deerfield, Duncan, Elk, Farmington, Hamilton, Liberty,
Middlebury, Nelson, Rutland, Shippen, Sullivan, Union, Ward and Westfield;
therefore, the authorities and acknowledgements for those communities are not
available.
For this countywide FIS, the DFIRM database was prepared for FEMA by GG3, a
joint venture between Gannett Fleming, Inc., Camp Hill, Pennsylvania and
Greenhorne & O’Mara, Inc., Laurel, Maryland under Joint Venture Contract No.
EMP-2003-CO-2606, Task Order No. 10. This work was completed in December
2009.
For this countywide study, all streams studied by detailed methods were redelineated
using LiDAR data flown in 2006. For streams studied with approximate methods, the
1-percent-annual-chance flood elevations were determined from the regional
relationship between drainage area and flood depth prepared by the USGS. This
relationship was developed by means of regional regression analyses of basin areas
and the within channel 1-percent-annual-chance flood depths observed at stream
gages. Depths were adjusted on the basis of hydraulic calculations to account for
increased depth due to backwater from hydraulic structures, such as bridges and
culverts. This work was performed by Dewberry, under Map Modernization Contract
No. HSFE03-07-D-0037, Task Order HSFE03-08-J-0007, for FEMA.
The orthophotography base mapping was provided by the PAMAP (Pennsylvania
Statewide Digital Map) Program, PA Department of Conservation and Natural
4
Resources, Bureau of Topographic and Geologic Survey. The imagery was derived
from aerial photography flown at 1-foot ground sample distance in April 2005. The
projection used in the production of this digital FIRM was Pennsylvania State Plane
North Zone (FIPSZONE 3701) coordinate system with a Lambert Conformal Conic
projection, units in feet, and referenced to the North American Datum of 1983,
GRS80 spheroid. Differences in datum and spheroid used in the production of the
FIRMs for adjacent counties may result in slight positional differences in map
features at the county boundaries. These differences do not affect the accuracy of
information shown on this FIRM.
1.3
Coordination
An initial Consultation Coordination Officer's (CCO) meeting is held typically with
representatives of FEMA, the community, and the study contractor to explain the
nature and purpose of an FIS, and to identify the streams to be studied by detailed
methods. A final CCO meeting is held typically with the same representatives to
review the results of the study. The initial and final meeting dates for the previous
FIS reports for Tioga County and its communities are listed in Table 1, “Initial and
Final CCO Meetings.”
TABLE 1 - INITIAL AND FINAL CCO MEETINGS
Community Name
Blossburg, Borough of
Covington, Township of
Delmar, Township of
Elkland, Borough of
Elkland, Township of
Gaines, Township of
Jackson, Township of
Lawrence, Township of
Lawrenceville, Borough of
Morris, Township of
Osceola, Township of
Putnam, Township of
Richmond, Township of
Tioga, Township of
Wellsboro, Borough of
* Notification by Letter
Initial CCO Date
January 1976
January 1976
March 15, 1985
March 14, 1985
July 18, 1989*
March 1975
May 1976
August 1976
August 1976
June 1977
December 12, 1985
January 1976
January 1976
August 1976
November 1975
5
Final CCO Date
July 11, 1979
July 11, 1979
September 27, 1989
September 27, 1989
December 12, 1989
April 5, 1977
September 14, 1977
September 13, 1979
September 13, 1979
July 12, 1979
September 19, 1990
July 11, 1979
July 11, 1979
September 13, 1979
August 23, 1978
2.0
AREA STUDIED
2.1
Scope of Study
This FIS covers the geographic area of Tioga County, Pennsylvania, including the
communities listed in Section 1.1.
All or portions of the streams in Table 2, “Streams Studied by Detailed Methods,”
were studied by detailed methods. Limits of detailed study are indicated on the Flood
Profiles (Exhibit 1) and on the FIRM (Exhibit 2).
TABLE 2 – STREAMS STUDIED BY DETAILED METHODS
Alder Run
Babb Creek
Bear Creek No. 1
Bentley Creek
Boyden Brook
Camp Brook Creek
Charleston Creek
Crooked Creek
Elkhorn Creek
Hammond Creek
Harrison Run
Harts Creek
Hoover Brook
Johnson Creek
Kelsey Creek
Kizer Creek
Long Run No. 1
Marsh Creek
Mill Creek No. 1
Mitchell Creek
Morris Branch
North Run No. 1
Painter Run No. 1
Phoenix Run
Pine Creek
Smith Creek
Tioga River Reach 1
Tioga River Reach 2
Wilson Creek
The areas studied by detailed methods were selected with priority given to all known
flood hazard areas and areas of projected development and proposed construction.
Streams that have names in this countywide FIS other than those used in the
previously printed FIS reports for the communities in which they area located are
shown in Table 3, “Stream Name Changes.”
TABLE 3 – STREAM NAME CHANGES
Community
Township of Tioga
Borough of
Lawrenceville,
Township of Lawrence
Township of Deerfield,
Borough of Elkland,
Township of Nelson,
Township of Osceola
Old Name
Bear Creek
New Name
Bear Creek No. 1
Cowanesque River
Cowanesque River
6
TABLE 3 – STREAM NAME CHANGES (continued)
Borough of Blossburg
Township of Morris
Township of Tioga
Township of Jackson
Township of Tioga
Township of Lawrence,
Borough of
Lawrenceville, Borough
of Tioga, Township of
Tioga
Borough of Blossburg,
Township of Covington,
Township of Hamilton,
Borough of Mansfield,
Township of Putnam,
Township of Richmond
Johnson Run
Long Run
Mill Creek
North Run
Painter Run
Johnson Creek
Long Run No. 1
Mill Creek No. 1
North Run No. 1
Painter Run No. 1
Tioga River
Tioga River Reach 1
Tioga River
Tioga River Reach 2
Numerous flooding sources in the county were studied by approximate methods.
Approximate analyses were used to study those areas having a low development
potential or minimal flood hazards. The scope and methods of study were proposed
to, and agreed upon by, FEMA and Tioga County.
2.2
Community Description
Tioga County is bordered by Steuben County, New York to the north, Chemung
County, New York to the northeast, Bradford County to the east, Lycoming County
to the south and Potter County to the west. The population of Tioga County is
41,373 people as of the year 2000 (Reference 16). The total area of the county is
approximately 1,137 square miles (Reference 16).
Tioga County is located in the Appalachian Plateau Province in Pennsylvania. This
region is characterized by mountainous land. The land form is a result of geologic
activity in which layers of rock were folded upwards by internal pressure.
Glaciation, rain and other climactic elements have gradually eroded some of these
protrusions. The podzolic soil supports diversified vegetation with hard and soft
wood trees prevalent in the surrounding mountains (Reference 6).
The climate in the study area is generally continental in nature, modified by the
effects of the Atlantic Ocean and the Gulf of Mexico. Moderately warm summers,
with temperatures occasionally rising above 85 degrees Fahrenheit (°F) and cool
winters, with temperatures occasionally dropping below 20°F, characterize the
climate. Summer and winter mean temperatures range from 67°F to 21°F,
respectively. Temperature extremes range from -30°F (February 1934) to a sultry
104°F (July 1936). The annual precipitation averages 33.43 inches (Reference 17).
7
2.3
Principal Flood Problems
The history of flooding along the streams in Tioga County indicates that floods can
occur in any season of the year; however, the possibility of flooding is greatly
reduced during the winter months. Although most severe floods have been attributed
to rainfall alone, floods occurring in spring have been compounded by snow melt and
moving ice. The area's major floods in late summer and fall have been associated
with tropical storms and hurricanes moving up the Atlantic Coast. The following
paragraphs summarize the principal flooding problems within Tioga County.
The Tioga River is the chief source of flood damage in the Boroughs of Blossburg
and Lawrenceville and the Townships of Covington, Lawrence, Putnam,
Tioga and Richmond. The largest recorded flood on the Tioga River occurred
in June 1972, during Tropical Storm Agnes. The river gage upstream located in
Tioga, Pennsylvania, USGS Gaging Station No. 01518000, registered a record 59,000
cubic feet per second (cfs). A flood of similar intensity occurred in 1889. Both
storms are considered to have a 1-percent-annual-chance of occurrence. Other
serious flooding occurred in 1865, 1946, 1955, 1975 and 1976. The return period of
the 1946 flood was approximately 50 years, or 2-percent-annual-chance of
occurrence, and the return period of the 1975 flood, caused by Tropical Storm Eloise,
was approximately 25 years, or 4-percent-annual-chance occurrence. Floodwaters
resulting from both Agnes and Eloise caused considerable damage to property,
buildings and bridges in these municipalities.
Cowanesque River is a major source of flooding in the Boroughs of Elkland and
Lawrenceville, and the Townships of Elkland, Lawrence and Osceola. The two
floods of record occurred in 1972 during Tropical Storm Agnes and in 1975 during
Tropical Storm Eloise. The river gage located upstream of the Borough of
Lawrenceville, Pennsylvania, USGS Gaging Station No. 01520000, registered 43,700
cfs and 40,500 cfs, respectively.
Marsh Creek is the principal source of flooding within the Borough of Wellsboro and
the Township of Delmar. However, since the completion of three dams by the NRCS,
formerly known as the Soil Conservation Service, there has been no flood damage
since 1968. Prior to the completion of these three dams, the most destructive floods
occurred in 1889 and 1919 (Reference 18). This stream is ungaged and no data is
available to provide information about the magnitude and severity of past flooding in
the area.
The principal sources of flooding within the Township of Morris are the confluence
of Pine Creek and Babb Creek, and the confluence of Babb Creek and Wilson Creek.
The Villages of Blackwell, Hoytville and Morris are located at these confluences.
Based upon historical data, these areas have experienced damage from floods that
occurred in March 1936, May 1946, November 1950, June 1972, March 1951 and
September 1975. The river gage located on Pine Creek in Cedar Run, Pennsylvania,
USGS Gaging Station No. 01548500, recorded discharges of 30,900 cfs, 52,000 cfs,
33,400 cfs, 66,000 cfs, 28,100 cfs and 44,300 cfs respectively. Each flood resulted in
considerable damage to bridges and homes.
8
The principal sources of flooding in the Township of Gaines are Pine Creek and
Phoenix Run. The most severe flooding conditions within the Township of Gaines
occurred in June 1972, according to township officials, during Tropical Storm Agnes.
Pine Creek overflowed its banks causing first floor flooding to buildings adjacent to
the creek. Flooding that occurs on Phoenix Run is often compounded by flooding
from Pine Creek, due to the backwater effect that results. However, a sudden
downpour could cause flooding of Phoenix Run, independent of Pine Creek.
Estimates of frequencies of major floods for these two streams were unavailable due
to a lack of hydrographic data for the study area.
Additional sources of flooding include East Branch Stony Fork in the Township of
Delmar, Camp Brook Creek and Kizer Creek in the Borough of Elkland, Hammond
Creek, Alder Run and North Run No. 1 in the Township of Jackson, Long Run No. 1
and Harrison Run in the Township of Morris, and Charleston Creek, Tributary No. 1
to Charleston Creek, Morris Branch, Kelsey Creek, Boyden Brook, and Hoover
Brook in the Borough of Wellsboro. These streams are ungaged and no data is
available to provide information about the magnitude and severity of past flooding in
the area.
2.4
Flood Protection Measures
At present, there are no flood protection structures located within the Townships of
Elkland, Gaines, Jackson and Morris. Residents of these municipalities rely on the
usual warnings through radio, television and the local newspapers for information
concerning possible flood conditions.
A watershed protection and flood prevention project was completed by the NRCS,
which consisted of accelerated land treatment measures, floodplain management,
nonstructural measures such as floodproofing, a permanent relocation and flood
warning system and a system of structural diking. This project affects the Borough of
Blossburg and the Townships of Covington, Putnam and Richmond.
Several dams and reservoirs exist in the Marsh Creek watershed that aid in flood
reduction in the Borough of Wellsboro and the Township of Delmar. All of the dams
are multi-purpose structures which perform flood protection, recreational and water
supply functions. The flood water storage capacities afforded by these structures,
identified as PA-600, PA-601 and PA-602, are 470 acre-feet, 260 acre-feet and 1,355
acre-feet, respectively (Reference 19).
The Township of Lawrence and the Boroughs of Lawrenceville and Wellsboro utilize
non-structural measures to aid in the prevention of future flood damage. These are in
the form of local land-use regulations, adopted from the Code of Federal Regulations,
Title 24, Chapter 10, FIA, Parts 1910.3A and 1910.3B, which control building within
areas that have a high risk of flooding (Reference 20).
In the Borough and Town of Tioga, a levee was constructed along Crooked Creek
and Tioga River Reach1 by the Pennsylvania Department of Environmental
Resources in 1954. The design discharge of this structure was 39,000 cfs, equal to the
flood of record at this location, which occurred May 4, 1953.
9
A levee was built along the East side of Tioga River Reach 2 to provide flood
protection to the Borough of Mansfield.
A levee system exists along the north bank of the Cowanesque River Reach 2 from
the Township of Osceola, through the Borough of Elkland, to the Borough of
Lawrenceville. The levee was constructed in January 1967 to protect the Borough of
Elkland from flooding. Improvements were made to the levee in order to provide
protection to the area from the Cowanesque River Reach 2 of flows up to 39,000 cfs,
which is greater than the previous maximum flood event of record, Tropical Storm
Agnes, which occurred in June 1972. It has been ascertained that the downstream
portion of the levee located along the north bank of the Cowanesque River Reach 2 in
the Borough of Elkland may not protect the community from the
1-percent-annual-chance flood.
The U.S. Army Corps of Engineers (USACE) Cowanesque Lake Project, is located on
the Cowanesque River Reach 1 in Lawrence, Pennsylvania, and serves as flood
protection for the Township of Lawrence. The project consisted of an earthfill dam
on the Cowanesque River Reach 1 approximately 2.2 miles above its confluence with
the Tioga River. The Cowanesque Reservoir extends approximately 8.0 miles
upstream when filled to the level of the dam’s spillway crest. The Cowanesque Dam
controls a total drainage area of 298 square miles, providing flood storage of 89,000
acre-feet.
The USACE Tioga-Hammond Dam Project is located in the Township of Tioga and
serves to reduce flood heights in the Townships of Lawrence and Tioga. This flood
control project consists of the Tioga Dam on the Tioga River Reach 1 and the
Hammond Dam on Crooked Creek. These dams are located approximately two miles
above the confluence of the Tioga River Reach 1 and Crooked Creek. In addition to
flood control, the project also provides recreational facilities for camping, boating,
fishing and swimming. It controls a total drainage area of 402 square miles, with the
Tioga Dam controlling 280 square miles of the Tioga River Basin and the Hammond
Dam controlling 122 square miles of the Crooked Creek basin. The combined storage
capacity of the Tioga and Hammond Reservoirs is 120,000 acre-feet.
3.0
ENGINEERING METHODS
For the flooding sources studied in detail in the community, standard hydrologic and
hydraulic study methods were used to determine the flood-hazard data required for this study.
Flood events of a magnitude which are expected to be equaled or exceeded once on the
average during any 10-, 50-, 100-, or 500-year period (recurrence interval) have been selected
as having special significance for floodplain management and for flood insurance rates. These
events, commonly termed the 10-, 50-, 100- and 500-year floods, have a 10-, 2-, 1- and
0.2-percent-annual-chance, respectively, of being equaled or exceeded during any year.
Although the recurrence interval represents the long term average period between floods of a
specific magnitude, rare floods could occur at short intervals or even within the same year.
The risk of experiencing a rare flood increases when periods greater than one year are
considered. For example, the risk of having a flood which equals or exceeds the
1-percent-annual-chance flood in any 50-year period is approximately 40 percent (4 in 10);
for any 90-year period, the risk increases to approximately 60 percent (6 in 10). The analyses
reported herein reflect flooding potentials based on conditions existing in the community at
10
the time of completion of this study. Maps and flood elevations will be amended periodically
to reflect future changes.
3.1
Hydrologic Analyses
Hydrologic analyses were carried out to establish the peak discharge-frequency
relationships for each flooding source studied by detailed methods affecting the
communities within Tioga County.
Pre-countywide Analyses
Within Tioga County, the Boroughs of Blossburg, Elkland, Lawrenceville and
Wellsboro; and the Townships of Covington, Delmar, Elkland, Gaines, Jackson,
Lawrence, Morris, Osceola, Putnam, Richmond and Tioga have a previously
published FIS report. The hydrologic analyses described in those reports have been
compiled and are summarized below.
The hydrologic analysis to determine discharges for Alder Run, Hammond Creek,
North Run No. 1 and Phoenix Run was a modification of the U.S. Department of
Agriculture, NRCS procedure designated as “McSparran Tp, Condition III”, which
related basin characteristics to streamflow characteristics (Reference 21).
Discharges for Bear Creek No. 1, Bentley Creek, Elkhorn Creek, Harrison Run, Harts
Creek, Long Run No. 1, Mill Creek No. 1, Mitchell Creek, Painter Run No. 1,
reaches of Pine Creek located in the Township of Gaines, Smith Creek and Wilson
Creek were calculated using regression equations from a PADEP publication
(Reference 22). These regression equations, which are based on a regional analysis
of related drainage area, channel slope, percent area of storage, and an index of the
average annual excess precipitation to the peak discharge.
The
0.2-percent-annual-chance flood for each stream was determined by extending the
discharge-frequency curve plotted for each stream.
Discharges for Boyden Brook, Charleston Creek, Hoover Brook, Kelsey Creek,
Marsh Creek, Morris Branch and Tributary No. 1 to Charleston Creek followed the
NRCS procedure designated as “McSparran Tp, Condition III”, which relates basin
characteristics to streamflow characteristics (References 23, 24 and 26). However,
these hydrologic analyses were modified to account for the flood control dams along
these streams. Flood routing was performed through the dams on Marsh Creek,
causing a reduction in discharges downstream of the dams. Rainfall data was
calculated using the U.S. Department of Commerce Technical Paper No. 40
(Reference 25). This data was combined with basin characteristics such as drainage
area, stream slope, vegetation, land use and soil cover to estimate the resulting
discharge values, considering a time lapse to the peak discharge which was calculated
by empirical equations.
Discharges for Camp Brook Creek, East Branch Stony Fork and Kizer Creek were
determined using regional regression equations developed by the USGS
Water-Resources Investigations 82-21 (Reference 26).
Discharges for reaches of Cowanesque River Reach 2 located in the Borough of
Elkland and the Townships of Elkland and Osceola were determined by the USACE
from peak-flow records collected at the USGS Gaging Station No. 01520000, located
at Lawrenceville, Pennsylvania (Reference 27). The reach of the Cowanesque River
11
Reach 2 located in the Township of Osceola was checked against methods developed
by the Pennsylvania Department of Environmental Protection (PADEP) Regional
Regression Analysis and methods developed by the USACE Hydrologic Study for
Tropical Storm Agnes (Reference 22). Discharges for Babb Creek were also
obtained from the USACE Hydrologic Study for Tropical Storm Agnes
(Reference 28). Contribution from Holden Creek is accounted for by the following
USACE’s drainage area proportion equation for upstream areas:
Peak Flowupstream = Peak Flowdownstream * 0.75*(Areaupstream/Areadownstream)
Discharges for reaches of Cowanesque River Reach 1 located in the Borough of
Lawrenceville and the Township of Lawrence were developed by the USACE
considering the flood-flow reduction afforded by the operation of the Cowanesque
Dam. Due to the flood-flow reduction, the 10-, 2- and 1-percent-annual-chance
floods have the same value.
In the hydrologic analyses of Crooked Creek, downstream of the confluence of
Elkhorn Creek, it was assumed that since the uncontrolled drainage area of Elkhorn
Creek is considerably smaller than the controlled area of the Tioga-Hammond Dam,
the peak discharge of Elkhorn Creek would pass along before the peak spillway
discharge. Therefore, the 10-, 2- and 1-percent-annual-chance flood on Crooked
Creek adopted for the purpose of the Flood Insurance Study are the larger discharge
values computed for Elkhorn Creek. Downstream of the Elkhorn Creek confluence,
the 0.2-percent-annual-chance flood on Crooked Creek is the uncontrolled spillway
discharge for the Tioga-Hammond Dam (18,000 cfs).
Discharges for Johnson Creek and reaches of Tioga River Reach 2 located in the
Borough of Blossburg and the Townships of Covington, Putnam and Richmond were
developed from a NRCS hydrologic model (TR-20). The model was calibrated from
data obtained at the USGS Gaging Station No. 01518000, located on the Tioga River
Reach 1 immediately above the confluence with Crooked Creek at Tioga, Pennsylvania
(Reference 29). Selected rainfalls from the U.S. Department of Commerce Technical
Paper 40 were routed using the calibrated NRCS model and values of the 10-, 5-, 1and 0.2-percent-annual-chance floods were obtained (References 25 and 30).
Discharge-frequency curves were developed by the USACE for reaches of Tioga
River Reach 1 located in the Borough of Lawrenceville and the Township of
Lawrence at the USGS Gaging Station at Lindley, New York. These discharges were
modified by the USACE to reflect the flood-flow reduction afforded by the
Tioga-Hammond and Cowanesque Dams. Upstream of the Lindley gage, the
discharges on the Tioga River were prorated by the drainage area, taking into
consideration the regulated discharges of the Cowanesque River.
The discharges for reaches of Tioga River Reach 1, downstream of the confluence of
Crooked Creek, located in the Township of Tioga, are the 10-, 2- and
1-percent-annual-chance flood from the Tioga Dam outlet since the Crooked Creek
discharges will pass along before the Tioga River discharges. Downstream of the
Crooked Creek confluence, the discharges on the Tioga River were prorated by the
drainage, area, taking into consideration the Lindley gage discharges and the
regulated discharges of the Cowanesque Dam. These hydrologic analyses were
coordinated with the USACE.
12
Countywide Analyses
No new hydrologic analyses were conducted for detailed studied streams. For all
approximately studied streams, Pennsylvania regions I and III USGS regression
equations were used to estimate flood flows for the 1-percent-annual-chance
recurrence interval. Equations were developed utilizing peak flow data from 322
gaging stations within Pennsylvania and surrounding states. The equations for
regions I and III, in which Tioga County lies, use 4 parameters to estimate discharge;
drainage area (as determined from 30 meter digital elevation model), mean basin
elevation, percent carbonate bedrock, and percent storage.
A summary of drainage area-peak discharge relationships for all streams studied by
detailed methods is shown in Table 4, “Summary of Discharges.”
TABLE 4 – SUMMARY OF DISCHARGES
Flooding Source and Location
ALDER RUN
At the confluence with Hammond
Creek
Peak Discharges (cubic feet per second)
Drainage
Area
10-Percent2-Percent1-Percent0.2-Percent(square miles) Annual-Chance Annual-Chance Annual-Chance Annual-Chance
7.40
1,610
2,425
2,805
3,760
129.00
11,500
19,100
23,700
37,400
81.70
7,900
14,300
17,800
28,600
BEAR CREEK NO. 1
At the confluence with Tioga River
3.70
665
1,200
1,490
2,240
BENTLEY CREEK
2.60
505
920
1,145
1,750
0.90
650
950
1,000
1,500
0.70
450
700
750
1,050
10.40
*
*
3,440
*
7.82
*
*
2,790
*
6.16
*
*
2,340
*
BABB CREEK
At the confluence with Pine Creek
Above the confluence of Stony
Fork
BOYDEN BROOK
At the confluence with Kelsey
Creek
At the corporate limit between the
Borough of Wellsboro and the
Township of Delmar
CAMP BROOK CREEK
Borough of Elkland and the
Township of Nelson
Downstream of Ellison Road in the
Borough of Elkland
At Taft Avenue (Extended)
downstream of Tannery Street
*Data not available
13
TABLE 4 – SUMMARY OF DISCHARGES – continued
CHARLESTON CREEK
At the confluence with Morris
Branch
Downstream of the confluence of
Tributary No. 1 to Charleston
Creek
COWANESQUE RIVER REACH 1
At the confluence with the Tioga
River
Approximately 3,650 feet
downstream of Holden Street at
the Borough of Elkland corporate
limits
At State Route 49 bridge
Upstream of the confluence of
Holden Creek
CROOKED CREEK
River
Elkhorn Creek (regulated)
Downstream of the Village of
Draper
EAST BRANCH STONY FORK
Upstream of the confluence of East
Branch Stony Fork Tributary A
at the Village of Draper
Branch Stony Fork Tributary B
near junction of TR-812 and
Stony Fork Road
At a point approximately 1,000 feet
downstream of Village of Stony
Fork
Branch Stony Fork Tributary C
at Village of Stony Fork
ELKHORN CREEK
At the confluence with Crooked
Creek
Drainage
Area
12.70
1,850
2,700
2,950
4,200
12.00
1,550
2,250
2,500
3,550
300.00
6,200
6,200
6,200
9,140
242.00
19,000
33,000
39,000
57,000
233.00
*
*
39,000
*
229.00
17,000
28,000
34,724
50,000
132.00
1,570
2,730
3,360
18,000
131.00
300
300
300
300
16.60
*
*
5,330
*
14.60
*
*
5,200
*
11.70
*
*
4,630
*
10.80
*
*
4,350
*
6.60
*
*
2,720
*
11.00
1,565
2,730
3,360
5,000
*Data not available
14
HAMMOND CREEK
Township of Jackson and the
Township of Wells (Bradford
County)
At the confluence of North Run
No. 1
At the confluence of Alder Run
At the confluence of North Branch
Hammond Creek
Drainage
Area
28.10
4,525
6,745
7,715
10,070
21.80
10.30
3,740
2,100
5,560
3,145
6,390
3,650
8,430
4,830
5.50
1,235
1,870
2,190
2,885
HARRISON RUN
At the confluence with Babb Creek
3.30
500
900
1,060
1,620
HARTS CREEK
River
5.42
900
1,680
1,985
3,000
0.80
550
800
900
1,250
0.40
300
450
500
750
1,900
3,150
3,740
5,300
5.50
1,350
2,000
2,150
3,100
3.30
250
350
350
700
KIZER CREEK
At the confluence with Camp
Brook Creek
1.58
*
*
860
*
LONG RUN NO. 1
10.40
1,260
2,310
2,910
4,360
MARSH CREEK
Township of Delmar
20.80
3,300
4,850
5,350
7,300
HOOVER BROOK
At the confluence with Kelsey
Creek
Township of Delmar
JOHNSON CREEK
River
KELSEY CREEK
At the confluence with Morris
Branch
At the upstream confluence of
Boyden Creek
17.80
*Data not available
15
Drainage
Area
MILL CREEK NO. 1
Approximately 9,000 feet upstream
of U.S. Route 15 at the
downstream limit of detailed
study in the Township of Tioga
72.50
6,840
11,325
13,660
19,400
MITCHELL CREEK
13.00
1,785
3,100
3,800
5,620
2.30
600
900
1,000
1,400
1.90
250
450
500
700
NORTH RUN NO. 1
At the confluence with Hammond
Creek
3.80
1,080
1,720
1,190
2,655
PAINTER RUN NO. 1
At the confluence with Mill Creek
No. 1
5.20
870
1,550
1,920
2,920
PHOENIX RUN
At the confluence with Pine Creek
22.50
3,200
4,480
5,740
8,100
540.70
23,600
40,000
49,000
75,000
266.60
14,800
24,100
28,900
42,200
261.80
14,600
23,800
28,450
40,600
253.60
14,300
23,250
27,800
39,600
232.10
13,500
21,800
25,950
36,900
208.10
12,550
20,100
23,850
33,950
184.90
11,500
18,350
21,800
31,050
4.76
815
1,455
1,800
2,750
MORRIS BRANCH
At the confluence of Marsh Creek
At Central Avenue / State Route
287
PINE CREEK
Township of Morris and the
Township of Brown (Lycoming
County)
Township of Gaines and the
Township of Shippen
Upstream of the confluence of Mill
Run
Upstream of the confluence of Lick
Run
Long Run No. 2
Upstream of the confluence of Elk
Run No. 1
Phoenix Run
SMITH CREEK
At the confluence with Harts Creek
16
TIOGA RIVER REACH 1
At the downstream corporate limits
of the Borough of Lawrenceville,
Pennsylvania - New York State
boundary
Harts Creek
Mitchell Creek
Crooked Creek (regulated)
Drainage
Area
461.00
8,080
9,490
16,715
36,760
447.00
8,025
9,015
15,100
33,100
419.00
8,000
8,400
8,500
18,000
282.00
8,000
8,400
8,500
15,860
159.80
14,800
24,000
28,240
40,300
143.14
13,000
21,300
25,260
35,500
140.64
111.60
13,000
10,300
21,300
17,000
25,260
20,400
35,500
29,000
106.53
97.93
10,000
9,500
16,500
15,700
19,500
18,800
28,000
26,500
95.10
88.80
67.90
9,200
8,700
6,900
15,400
14,600
11,600
18,300
17,300
13,900
26,000
24,500
19,000
TRIBUTARY NO. 1 TO
CHARLESTON CREEK
At the confluence with Charleston
Creek
0.70
550
800
900
1,250
WILSON CREEK
23.00
2,020
3,700
4,600
6,450
TIOGA RIVER REACH 2
Township of Richmond and the
Borough of Mansfield
At Spencer Road in the Township
of Richmond
Townships of Covington and
Putnam
At State Route 660
Downstream of West Hill Road in
the Village of Covington
At North Williamson Road
Borough of Blossburg and the
Township of Covington
At Ruah Street
At South Williamson Road
Elevations for Tioga Lake were determined using a spillway rating curve. The
elevations along the entire shoreline for the 10-, 2-, 1- and 0.2-percent-annual-chance
floods were 1,109.6 feet, 1,126.9 feet, 1,132.3 feet and 1,137.3 feet, respectively.
3.2
Hydraulic Analyses
Analyses of the hydraulic characteristics of flooding from the sources studied were
carried out to provide estimates of the elevations of floods of the selected recurrence
intervals. Users should be aware that the flood elevations shown on the FIRM
17
represent rounded whole-foot elevations and may not exactly reflect the elevations
shown on the Flood Profiles or in the Floodway Data tables in the FIS report. The
flood elevations shown on the FIRM are primarily intended for flood insurance rating
purposes. For construction and/or floodplain management purposes, users are
encouraged to use the flood elevation data presented in this FIS in conjunction with
the data shown on the FIRM.
Flood profiles were drawn showing computed water-surface elevations to an
accuracy of 0.5 foot for floods of the selected recurrence intervals. Locations of
selected cross sections used in the hydraulic analyses are shown on the Flood Profiles
(Exhibit 1). For stream segments for which a floodway is computed (Section 4.2),
selected cross-section locations are also shown on the FIRM (Exhibit 2).
The hydraulic analyses for these studies were based on unobstructed flow. The flood
elevations shown on the profiles are thus considered valid only if hydraulic structures
remain unobstructed, operate properly, and do not fail.
All elevations shown on the Flood Profiles and FIRM (Exhibits 1 and 2) are
referenced to the North American Vertical Datum of 1988 (NAVD 88).
Pre-countywide Analyses
Within Tioga County, the Boroughs of Blossburg, Elkland, Lawrenceville and
Wellsboro; and the Townships of Covington, Delmar, Elkland, Gaines, Jackson,
Lawrence, Morris, Osceola, Putnam, Richmond and Tioga have a previously
published FIS report. The hydraulic analyses described in those reports have been
compiled and are summarized below.
Water surface profiles for the 10-, 2-, 1- and 0.2-percent-annual-chance floods along
Alden Run, Bear Creek No. 1, Bentley Creek, Boyden Brook, Charleston Creek,
reaches of Cowanesque River located in the Borough of Lawrenceville and the
Townships of Lawrence and Osceola, Crooked Creek, Elkhorn Creek, Hammond
Creek, Harrison Run, Harts Creek, Hoover Brook, Kelsey Creek, Long Run No. 1,
Marsh Creek, Mill Creek No. 1, Mitchell Creek, Morris Branch, North Run No. 1,
Painter Run No. 1, Phoenix Run, Pine Creek, Smith Creek, reaches of Tioga River
Reach 1 located in the Borough of Lawrenceville and the Townships of Lawrence
and Tioga, Tributary No. 1 to Charleston Creek and Wilson Creek were calculated
using the USACE’s HEC-2 step-backwater computer program (References 31 and
32).
The water surface profiles along Camp Brook Creek, reaches of Cowanesque River
Reach 2 located in the Borough of Elkland and Township of Nelson, Kizer Creek and
East Branch Stony Fork, from a point approximately 3.1 miles above the corporate
limits between the Townships of Delmar and Morris to a point approximately 0.6
miles upstream, were computed by modeling channel and bridge hydraulics with the
USGS WSPRO step-backwater computer model (References 33 and 34).
The water surface profiles along East Branch Stony Fork from a point approximately
1.6 miles above the downstream corporate limits between the Townships of Delmar
and Morris to a point approximately 1.5 miles upstream, the normal depths of
flooding for the 1-percent-annual-chance flood were estimated from the regional
18
relationship between drainage area and flood depth prepared by the USGS
(Reference 35).
The water surface profiles along Johnson Creek and the reaches of Tioga River
Reach 2 located in the Borough of Blossburg and the Townships of Covington,
Putnam and Richmond were calculated using the NRCS WPS-2 computer program
(Reference 36).
Along Alder Run, Bear Creek No. 1, Bentley Creek, Camp Brook Creek, reaches of
Cowanesque River Reach 2 located in the Borough of Elkland and Township of
Nelson, East Branch Stony Fork, Elkhorn Creek, Hammond Creek, Harrison Run,
Harts Creek, Kizer Creek, Long Run No. 1, Mill Creek No. 1, North Run No. 1,
Painter Run No. 1, Smith Creek and Wilson Creek cross sections were obtained from
field surveys. All bridges, dams and culverts were surveyed to obtain elevation data
and structural geometry information. Cross sections were located at close intervals
above and below bridges and culverts in order to compute the significant backwater
effects of these structures.
Cross section information for the reach of Cowanesque River Reach 2 located in the
Township of Osceola was obtained from the digitization of aerial photographs at a
scale of 1:9,600 (Reference 37). Information below the water line was based on field
measurements. All bridges were field-verified to obtain elevation data and structural
geometry.
Cross section information for Crooked Creek and for reaches of Cowanesque River
Reach 1 located in the Borough of Lawrenceville and Township of Lawrence was
obtained from the PADEP.
Cross section information for Johnson Creek and reaches of Tioga River Reach 2
located in the Borough of Blossburg and the Townships of Covington, Putnam and
Richmond were obtained from field surveys and available topographic maps and
were located along stream lengths at intervals reflecting significant changes in
ground elevation, land use cover and at bridges (Reference 38). Cross section
information for Boyden Brook, Charleston Creek, the reach of Cowanesque River
Reach 2 located in the Township of Osceola, Hoover Brook, Kelsey Creek, Marsh
Creek, Morris Branch, Phoenix Run, Pine Creek and Tributary No. 1 to Charleston
Creek were obtained from field surveys and aerial photographs flown in April 1975,
at a negative scale of 1:1,200. Information below the water line was based on field
measurements. All bridges were field-verified to obtain elevation data and structural
geometry.
Cross section information for the reach of Marsh Creek located in the Township of
Delmar, was obtained from topographic information based on aerial photographs at a
scale of 1:14,400. Information below the water line was based on field
measurements.
Cross sections for reaches of the Tioga River Reach 1 located in the Borough of
Lawrenceville and Township of Lawrence were obtained by the Susquehanna River
Basin Commission (SRBC) and from the Pennsylvania Department of Transportation
(PennDOT). Cross section information along the reach of Tioga River Reach 1
located in the Township of Tioga was obtained from the PADEP and PennDOT.
19
Information from the Lawrenceville levee profile was added to the Tioga River
sections.
The starting water surface elevations for Alder Run and North Run No. 1 were taken
from the Hammond Creek profiles.
The starting water surface elevations along Bear Creek No. 1, Bentley Creek, the
reach of Cowanesque River Reach 2 located in the Township of Osceola, Crooked
Creek, East Branch Stony Fork, Elkhorn Creek, Hammond Creek, Harrison Run,
Harts Creek, Long Run No. 1, Marsh Creek, Mill Creek No. 1, Mitchell Creek,
Painter Run No. 1, Pine Creek, Smith Creek, the reaches of Tioga River Reach 2
located in the Borough of Blossburg and the Townships of Covington, Putnam and
Richmond and Wilson Creek were calculated by the slope-area method. The
downstream portion of Mill Creek No. 1 is influenced by backwater from Tioga
Lake. Normal pool elevations for the various frequency floods for Mill Creek No. 1
were obtained from the USACE.
The starting water surface elevations for Boyden Brook and Hoover Brook were
taken from the Kelsey Creek profiles.
The starting water surface elevations for Camp Brook Creek, Kizer Creek and
reaches of Cowanesque River Reach 2 located in the Borough of Elkland and
Township of Nelson were taken from the profile developed by the USACE
(Reference 27). Flood profiles were drawn showing computed water-surface profiles
for floods of the selected recurrence interval. Depths of flooding were adjusted on
the basis of hydraulic calculations to account for increased depth due to backwater
from culverts (Reference 39).
The starting water surface elevations for Charleston Creek, Kelsey Creek and Morris
Branch were taken from the Marsh Creek profiles.
For Johnson Creek, coincident flow conditions with the Tioga River were assumed.
The starting water surface elevations for Phoenix Run were taken from the Pine
Creek profiles.
The starting water surface elevations for reaches of Tioga River Reach 1 located in
the Borough of Lawrenceville and the Townships of Lawrence and Tioga and for
reaches of Cowanesque River Reach 1 located in the Borough of Lawrenceville and
the Township of Lawrence, were obtained from the SRBC at the Pennsylvania-New
York State boundary.
The starting water surface elevations for Tributary No. 1 to Charleston Creek were
taken from the Charleston Creek profiles.
Roughness coefficients (Manning's "n" values) were estimated based on a field
inspection of the individual streams supplemented by the use of aerial photography.
Roughness coefficients were selected using engineering judgment based on tables
published by Ven Te Chow and channel conditions and overbank vegetation or land
use (Reference 40).
20
The tabulation showing the channel and overbank Manning’s "n" values for the
streams studied by detailed methods can be found in Table 5, “Manning’s “n”
Values.”
TABLE 5 – MANNING’S “n” VALUES
Stream
Alder Run
Babb Creek
Bear Creek No. 1
Bentley Creek
Boyden Brook
Camp Brook Creek
Charleston Creek
Crooked Creek
Elkhorn Creek
Hammond Creek
Harrison Run
Harts Creek
Hoover Brook
Johnson Creek
Kelsey Creek
Kizer Creek
Long Run No. 1
Marsh Creek
Mill Creek No. 1
Mitchell Creek
Morris Branch
North Run No. 1
Painter Run No. 1
Phoenix Run
Pine Creek
Smith Creek
Tioga River Reach 1
Tioga River Reach 2
Wilson Creek
Channel “n”
0.065
0.042
0.030 – 0.040
0.030 – 0.040
0.014 – 0.075
0.035 – 0.040
0.014 – 0.075
0.032 – 0.037
0.032 – 0.040
0.027 – 0.040
0.034 – 0.036
0.030 – 0.040
0.065 – 0.075
0.045
0.040
0.014 – 0.075
0.040 – 0.050
0.014 – 0.075
0.035 – 0.040
0.045
0.014 – 0.075
0.030 – 0.040
0.030 – 0.040
0.014 – 0.075
0.060 – 0.075
0.030 – 0.040
0.030 – 0.054
0.030 – 0.040
0.040
0.032 – 0.037
0.040
0.014 – 0.075
0.042
Overbank “n”
0.035 – 0.065
0.085 – 0.100
0.040 – 0.100
0.040 – 0.100
0.040 – 0.100
0.048 – 0.075
0.040 – 0.100
0.040 – 0.055
0.030 – 0.075
0.400 – 0.500
0.038 – 0.062
0.040 – 0.100
0.030 – 0.070
0.085 – 0.100
0.040 – 0.100
0.040 – 0.100
0.100 – 0.110
0.040 – 0.100
0.048 – 0.075
0.100
0.040 – 0.100
0.030 – 0.100
0.040 – 0.100
0.040 – 0.100
0.030 – 0.070
0.040 – 0.100
0.055 – 0.085
0.050 – 0.100
0.040 – 0.100
0.040 – 0.090
0.060 – 0.085
0.040 – 0.100
0.100
Countywide Analyses
No new detailed hydraulic analyses were conducted. For all streams studied by
approximate methods, water surface profiles were computed using HEC-RAS steady
state simulation. HEC-RAS applies a peak discharge at each cross section to
21
determine a maximum water surface elevation. The elevations are calculated using
the standard step method and the energy, continuity, and Manning equations. A
subcritical flow regime was assumed for all reaches. Manning’s n-values were
derived based on land use data obtained from Pennsylvania Spatial Data Access
(PASDA).
Qualifying bench marks within a given jurisdiction are cataloged by the National
Geodetic Survey (NGS) and entered into the National Spatial Reference System
(NSRS). First or Second Order Vertical bench marks that have a vertical stability
classification of A, B, or C are shown and labeled on the FIRM with their 6-character
NSRS Permanent Identifier.
Bench marks cataloged by the NGS and entered into the NSRS vary widely in
vertical stability classification. NSRS vertical stability classifications are as follows:
Stability A: Monuments of the most reliable nature, expected to hold
position/elevation well (e.g., mounted in bedrock)
Stability B: Monuments which generally hold their position/elevation well (e.g.,
concrete bridge abutments)
Stability C: Monuments which may be affected by surface ground movements (e.g.,
concrete mounted below frost line)
Stability D: Mark of questionable or unknown vertical stability (e.g., concrete
monument above frost line, or steel witness post)
In addition to NSRS bench marks, the FIRM may also show vertical control
monument established by a local jurisdiction; these monuments will be shown on the
FIRM with the appropriate designations. Local monuments will only be placed on
the FIRM if the community has requested that they be included, and if the
monuments meet the aforementioned NSRS inclusion criteria.
To obtain current elevation, description and/or location information for bench marks
shown on the FIRM for this jurisdiction, please contact the Information Services
Branch of the NGS at (301) 713-3242, or visit their Web site, www.ngs.noaa.gov.
It is important to note that temporary vertical monuments are often established during
the preparation of a flood hazard analysis for the purposes of establishing local
vertical control. Although these monuments are not shown on the digital FIRM, they
may be found in the Technical Support Data Notebook associated with this FIS and
FIRM. Interested individuals may contact FEMA to access this data.
3.3
Vertical Datum
All FIS reports and FIRMs are referenced to a specific vertical datum. The vertical
datum provides a starting point against which flood, ground and structure elevations
can be referenced and compared. Until recently, the standard vertical datum in use
for newly created or revised FISs and FIRMs was the National Geodetic Vertical
Datum of 1929 (NGVD 29). With the finalization of the NAVD 88, many FIS
22
reports and FIRMs are being prepared using NAVD 88 as the referenced vertical
datum.
For this countywide FIS, all flood elevations shown in the FIS report and on the
FIRM are referenced to NAVD 88. Structure and ground elevations in the
community must, therefore, be referenced to NAVD 88. It is important to note that
adjacent communities may be referenced to NGVD 29. This may result in
differences in base flood elevations across corporate limits between the communities.
As noted above, the elevations shown in the FIS report and on the FIRM for Tioga
County are referenced to NAVD 88. Ground, structure and flood elevations may be
compared and/or referenced to NGVD 29 by applying a standard conversion factor.
The conversion factor from NGVD 29 to NAVD 88 for Tioga County is -0.449 foot.
The locations used to establish the conversion factor were USGS 7.5-minute
topographic quadrangle corners that fell within the County, as well as those that were
within 2.5 miles outside the County. The bench marks are referenced to NAVD 88.
Conversion locations and values for Tioga County are shown below in Table 6,
“Vertical Datum Conversion Values.”
TABLE 6 – VERTICAL DATUM CONVERSION VALUES
USGS 7.5-minute
Quadrangle Name
Addison
Antrim
Asaph
Blossburg
Borden
Caton
Cherry Flats
Crooked Creek
Elkland
Galeton
Gleason
Harrison Valley
Jackson Summit
Keeneyville
Knoxville
Mansfield
Marshlands
Millerton
Potter Brook
Rexville
Roseville
Sabinsville
Tiadaghton
Latitude
(Decimal
Degrees)
42.000
41.625
41.750
41.625
42.000
42.000
41.625
41.750
41.875
41.625
41.625
41.875
41.875
41.750
41.875
41.750
41.625
41.875
41.875
42.000
41.750
41.750
41.625
Corner
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
SE
23
Longitude
(Decimal
Degrees)
-77.125
-77.250
-77.375
-77.000
-77.250
-77.000
-77.125
-77.125
-77.250
-77.625
-76.875
-77.625
-77.000
-77.250
-77.375
-77.000
-77.500
-76.875
-77.500
-77.625
-76.875
-77.500
-77.375
Conversion from
NGVD 29 to
NAVD 88 (foot)
-0.502
-0.466
-0.439
-0.480
-0.486
-0.457
-0.464
-0.461
-0.431
-0.420
-0.526
-0.401
-0.428
-0.421
-0.415
-0.422
-0.509
-0.436
-0.405
-0.393
-0.387
-0.451
-0.463
TABLE 6 – VERTICAL DATUM CONVERSION VALUES - continued
Latitude
Longitude
Conversion from
USGS 7.5-minute
(Decimal
(Decimal
NGVD 29 to
Quadrangle Name
Corner
Degrees)
Degrees)
NAVD 88 (foot)
Tioga
SE
41.875
-77.125
-0.459
Troupsburg
SE
42.000
-77.500
-0.463
West Pike
SE
41.750
-77.625
-0.478
Woodhull
SE
42.000
-77.375
-0.470
Average Conversion from NGVD 29 to NAVD 88 = -0.449 foot
The BFEs shown on the FIRM represent whole-foot rounded values. For example, a
BFE of 102.4 will appear as 102 on the FIRM and 102.6 will appear as 103.
Therefore, users that wish to convert the elevations in this FIS to NGVD 29 should
apply the conversion factor (+0.449 foot) to elevations shown on the Flood Profiles
and supporting data tables in this FIS report, which are shown at a minimum to the
nearest 0.1 foot.
NGVD29 – 0.449 = NAVD88
For more information on NAVD 88, see Converting the National Flood Insurance
Program to the North American Vertical Datum of 1988 (Reference 41) or contact
the Spatial Reference System Division, National Geodetic Survey, National Oceanic
and Atmospheric Administration, Silver Spring Metro Center 3, 1315 East-West
Highway, Silver Spring, Maryland 20910-3282, (301) 713-3242, or visit their web
site at www.ngs.noaa.gov.
4.0
FLOODPLAIN MANAGEMENT APPLICATIONS
The NFIP encourages State and local governments to adopt sound floodplain management
programs. To assist in this endeavor, each FIS provides 1–percent-annual-chance floodplain
data, which may include a combination of the following: 10-, 2-, 1- and
0.2-percent-annual-chance flood elevations; delineations of the 1- and 0.2–
percent-annual-chance floodplains; and the 1–percent-annual-chance floodway. This
information is presented on the FIRM and in many components of the FIS, including Flood
Profiles, Floodway Data tables and Summary of Stillwater Elevation tables. Users should
reference the data presented in the FIS as well as additional information that may be available
at the local Community Map Repository before making flood elevation and/or floodplain
boundary determinations.
4.1
Floodplain Boundaries
To provide a national standard without regional discrimination, the
1-percent-annual-chance flood has been adopted by FEMA as the base flood for
floodplain management purposes. The 0.2-percent-annual-chance flood is employed
to indicate additional areas of flood risk in the community. For the streams studied in
detail, the 1- and 0.2-percent-annual-chance floodplain boundaries have been
delineated using the flood elevations determined at each cross section.
24
LiDAR technology was used as the terrain data source for both redelineation of
detailed and approximate floodplains in this study. This hi-resolution terrain data
allows for more accuracy in floodplain mapping. The data was collected under the
PAMAP program for several counties in Pennsylvania in Spring 2006.
The 1- and 0.2-percent-annual-chance floodplain boundaries are shown on the FIRM
(Exhibit 2). On this map, the 1-percent-annual-chance floodplain boundary
corresponds to the boundary of the areas of special flood hazards (Zones A, AE, AH,
AO, A99, V and VE), and the 0.2-percent-annual-chance floodplain boundary
corresponds to the boundary of areas of moderate flood hazards. In cases where the
1- and 0.2-percent-annual-chance floodplain boundaries are close together, only the
1-percent-annual-chance floodplain boundary has been shown. Small areas within
the floodplain boundaries may lie above the flood elevations but cannot be shown
due to limitations of the map scale and/or lack of detailed topographic data.
For the streams studied by approximate methods, only the 1-percent-annual-chance
floodplain boundary is shown on the FIRM.
4.2
Floodways
Encroachment on floodplains, such as structures and fill, reduces flood-carrying
capacity, increases flood heights and velocities, and increases flood hazards in areas
beyond the encroachment itself. One aspect of floodplain management involves
balancing the economic gain from floodplain development against the resulting
increase in flood hazard. For purposes of the NFIP, a floodway is used as a tool to
assist local communities in this aspect of floodplain management. Under this concept,
the area of the 1-percent-annual-chance floodplain is divided into a floodway and a
floodway fringe. The floodway is the channel of a stream, plus any adjacent
floodplain areas, that must be kept free of encroachment so that the
1-percent-annual-chance flood can be carried without substantial increases in flood
heights. Minimum federal standards limit such increases to 1.0 foot, provided that
hazardous velocities are not produced. The floodways in this FIS are presented to
local agencies as a minimum standard that can be adopted directly or that can be used
as a basis for additional floodway studies.
The floodways presented in this FIS were computed for certain stream segments on
the basis of equal conveyance reduction from each side of the floodplain. Floodway
widths were computed at cross sections. Between cross sections, the floodway
boundaries were interpolated. The results of the floodway computations are tabulated
for selected cross sections in Table 7, “Floodway Data.” The computed floodways
are shown on the FIRM (Exhibit 2). In cases where the floodway and 1-percent
annual chance floodplain boundaries are either close together or collinear, only the
floodway boundary is shown
Encroachment into areas subject to inundation by floodwaters having hazardous
velocities aggravates the risk of flood damage and heightens potential flood hazards
by further increasing velocities. A listing of stream velocities at selected cross
sections is provided in Table 7, “Floodway Data.” In order to reduce the risk of
property damage in areas where the stream velocities are high, the community may
wish to restrict development to areas outside the floodways.
25
Near the mouths of streams studied in detail, floodway computations are made
without regard to flood elevations on the receiving water body. Therefore, “Without
Floodway” elevations presented in Table 7 for certain downstream cross sections of
Harts Creek and Smith Creek are lower than the regulatory flood elevations in that
area, which must take into account the 1-percent-annual-chance flooding due to
backwater from other sources.
Along streams where floodways have not been computed, the community must
ensure that the cumulative effect of development in the floodplains will not cause
more than a 1.0-foot increase in the BFEs at any point within the community.
The area between the floodway and the 1-percent-annual-chance floodplain
boundaries is termed the floodway fringe. The floodway fringe encompasses the
portion of the floodplain that could be completely obstructed without increasing the
water surface elevation of the 1-percent-annual-chanceflood by more than 1.0 foot at
any point. Typical relationships between the floodway and the floodway fringe and
their significance to floodplain development are shown in Figure 1, “Floodway
Schematic”.
Figure 1 – Floodway Schematic
Floodways were not computed for Camp Brook Creek, East Branch Stony Fork, and
Kizer Creek.
26
FLOODING SOURCE
CROSS SECTION
1-PERCENT-ANNUAL-CHANCE
WATER-SURFACE ELEVATION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Alder Run
A
B
C
D
E
F
G
H
I
J
640
1
900
1
1,350
1
2,740
1
3,660
1
4,740
1
5,390
1
5,830
1
6,400
1
6,620
1
150
99
58
28
27
30
34
34
34
38
374
380
300
189
225
212
229
206
211
176
7.5
7.4
9.4
14.0
11.8
12.5
10.9
12.1
10.2
12.2
1,267.7
1,274.6
1,284.8
1,315.0
1,338.6
1,361.0
1,371.4
1,380.2
1,388.2
1,393.1
1,267.7
1,274.6
1,284.8
1,315.0
1,338.6
1,361.0
1,371.4
1,380.2
1,388.2
1,393.1
1,268.7
1,275.3
1,285.8
1,315.4
1,339.6
1,361.6
1,371.8
1,380.9
1,389.2
1,393.5
1.0
0.7
1.0
0.4
1.0
0.6
0.4
0.7
1.0
0.4
A
B
C
D
E
F
G
H
I
1,761
2
4,500
2
27,500
2
29,500
2
30,625
2
31,875
2
34,875
2
36,450
2
38,200
2
146
371
599
444
300
301
276
441
753
2,287
2,752
3,472
2,318
1,885
2,547
2,181
3,983
6,603
10.4
8.6
5.1
7.7
9.4
7.0
8.2
4.5
2.7
864.2
875.0
995.2
1,005.6
1,014.1
1,022.2
1,039.8
1,046.3
1,049.7
864.2
875.0
995.2
1,005.6
1,014.1
1,022.2
1,039.8
1,046.3
1,049.7
864.7
875.8
996.2
1,006.6
1,014.1
1,023.1
1,040.0
1,047.1
1,050.5
0.5
0.8
1.0
1.0
0.0
0.9
0.2
0.8
0.8
Babb Creek
1
2
Feet above confluence with Hammond Creek
Feet above confluence with Pine Creek
FEDERAL EMERGENCY MANAGEMENT AGENCY
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
ALDER RUN – BABB CREEK
27
FLOODING SOURCE
CROSS SECTION
Bear Creek No. 1
A
B
C
D
E
F
G
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
555
1
1,125
1
2,145
1
3,020
1
3,490
1
4,390
1
5,390
1
110
82
40
43
76
40
46
810
486
196
143
368
140
147
1.8
3.1
7.6
10.4
4.0
10.7
10.2
1,026.9
1,027.0
1,038.6
1,053.3
1,073.5
1,090.5
1,117.3
1,026.9
1,027.0
1,038.6
1,053.3
1,073.5
1,090.5
1,117.3
1,027.8
1,028.0
1,039.4
1,053.3
1,073.5
1,090.5
1,117.3
0.9
1.0
0.8
0.0
0.0
0.0
0.0
Bentley Creek
A
B
C
D
E
255
1
660
1
1,215
1
2,175
1
3,905
1
27
41
38
28
33
132
222
116
104
110
8.7
5.2
9.9
11.0
10.5
1,017.1
1,025.9
1,037.4
1,056.6
1,097.6
1,017.1
1,025.9
1,037.4
1,056.6
1,097.6
1,018.1
1,026.2
1,037.5
1,056.9
1,098.2
1.0
0.3
0.1
0.3
0.6
A
B
C
D
E
F
240
2
810
2
1,105
2
1,575
2
2,110
2
2,750
2
13
20
68
42
23
19
83
105
151
114
102
89
12.0
9.5
5.6
7.5
8.3
9.6
1,361.7
1,376.3
1,385.0
1,397.3
1,407.5
1,423.8
1,361.7
1,376.3
1,385.0
1,397.3
1,407.5
1,423.8
1,362.7
1,377.0
1,385.0
1,397.3
1,407.7
1,423.8
1.0
0.7
0.0
0.0
0.2
0.0
Boyden Brook
1
2
Feet above confluence with Tioga River Reach 1
Feet above confluence with Kelsey Creek
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
BEAR CREEK NO. 1 – BENTLEY CREEK – BOYDEN BROOK
28
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
1
31
59
43
36
35
45
59
210
463
376
247
291
306
371
14.0
6.4
7.8
10.1
8.6
6.5
5.4
1,286.3
1,294.9
1,302.8
1,307.8
1,310.9
1,315.8
1,317.2
1,286.3
1,294.9
1,302.8
1,307.8
1,310.9
1,315.8
1,317.2
1,286.6
1,295.9
1,303.7
1,308.5
1,311.8
1,316.4
1,318.2
0.3
1.0
0.9
0.7
0.9
0.6
1.0
DISTANCE
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Charleston Creek
A
B
C
D
E
F
G
820
1
1,600
1
2,400
1
3,370
1
3,735
1
4,605
1
4,945
A
B
C
D
E
F
G
H
I
0
2
1,060
2
1,970
2
2,630
2
3,100
2
3,580
2
4,690
2
5,670
2
6,400
2
511
5
454
5
458
5
710
5
677
5
796
275
283
278
5
2,239
1,095
1,329
1,884
969
1,269
1,143
2,275
2,254
2.8
5.7
4.7
3.3
6.4
4.9
5.4
2.7
2.8
993.0
994.1
996.8
997.8
998.1
999.0
1,001.3
1,002.4
1,002.6
993.0
994.1
996.8
997.8
998.1
999.0
1,001.3
1,002.4
1,002.6
994.0
994.7
996.8
997.8
998.1
999.5
1,001.7
1,002.8
1,003.1
1.0
0.6
0.0
0.0
0.0
0.5
0.4
0.4
0.5
4
369
5
429
967
5
4,261
4,408
9,379
9.2
8.8
4.2
1,147.2
1,148.8
1,151.1
1,147.2
1,148.8
1,151.1
1,147.9
1,149.3
1,151.5
0.7
0.5
0.4
3
A-N
O
P
Q
66,780
4
67,380
4
68,735
1
Feet above confluence with Marsh Creek
Feet above Pennsylvania - New York State Boundary
3
No Floodway Data Computed
4
Feet above Cowanesque Dam
2
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
5
These widths consider adjustments made to ensure compliance with FEMA policy
regarding the mapping of floodways on levees
FLOODWAY DATA
CHARLESTON CREEK – COWANESQUE RIVER
REACH 1 – COWANESQUE RIVER REACH 2
29
FLOODING SOURCE
CROSS SECTION
(continued)
R
S
T
U
V
W
X
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
69,795
1
72,339
1
74,329
1
75,989
1
78,439
1
80,809
1
81,559
1
790
1,530
1,911
1,528
1,473
1,017
837
4,721
14,042
6,136
5,316
4,392
5,962
4,567
8.3
2.5
5.7
6.5
7.9
5.8
7.6
1,151.4
1,159.3
1,159.3
1,164.2
1,171.5
1,179.2
1,180.1
1,151.4
1,159.3
1,159.3
1,164.2
1,171.5
1,179.2
1,180.1
1,152.4
1,159.9
1,160.3
1,164.2
1,172.5
1,179.3
1,180.4
1.0
0.6
1.0
0.0
1.0
0.1
0.3
2
227
182
167
105
118
168
229
81
156
114
93
77
73
70
165
897
901
640
659
580
760
695
341
575
484
362
387
315
274
897
3.7
3.7
5.3
5.1
5.8
4.4
4.8
9.8
5.8
0.6
0.8
0.8
1.0
1.1
0.3
1,023.5
1,025.5
1,029.9
1,032.6
1,034.5
1,037.6
1,043.9
1,047.4
1,052.3
1,054.4
1,054.4
1,054.5
1,054.5
1,054.5
1,054.6
1,023.5
1,025.5
1,029.9
1,032.6
1,034.5
1,037.6
1,043.9
1,047.4
1,052.3
1,054.4
1,054.4
1,054.5
1,054.5
1,054.5
1,054.6
1,023.5
1,025.5
1,029.9
1,032.6
1,034.5
1,037.6
1,043.9
1,047.4
1,052.3
1,054.4
1,054.4
1,054.5
1,054.5
1,054.5
1,054.6
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
Crooked Creek
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
1
2
1,445
2
2,535
2
4,555
2
5,700
2
6,620
2
7,720
2
9,220
2
10,595
2
11,715
2
12,240
2
13,340
2
14,120
2
15,420
2
16,120
2
16,560
Feet above Cowanesque Dam
Feet above confluence with Tioga River Reach1
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
COWANESQUE RIVER REACH 2 – CROOKED
CREEK
30
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
78
45
69
74
72
53
299
264
348
295
303
263
11.2
12.7
9.6
11.4
11.1
12.8
1,064.0
1,084.8
1,096.5
1,124.4
1,142.0
1,176.7
1,064.0
1,084.8
1,096.5
1,124.4
1,142.0
1,176.7
1,064.0
1,084.8
1,097.5
1,124.5
1,142.0
1,176.7
0.0
0.0
1.0
0.1
0.0
0.0
101
104
166
258
160
52
284
363
181
176
271
241
231
239
104
75
180
242
199
218
734
821
755
978
641
479
1,757
1,115
870
840
780
748
778
777
534
462
670
1,142
478
525
10.5
9.0
9.8
7.4
11.3
15.2
3.6
5.7
7.3
7.6
8.2
7.6
7.3
7.3
10.6
12.3
8.5
3.2
7.6
6.7
1,152.8
1,155.3
1,162.7
1,174.7
1,181.7
1,187.8
1,192.7
1,195.2
1,200.6
1,207.5
1,217.4
1,220.1
1,227.5
1,232.5
1,236.6
1,239.7
1,261.0
1,263.8
1,272.4
1,290.5
1,152.8
1,155.3
1,162.7
1,174.7
1,181.7
1,187.8
1,192.7
1,195.2
1,200.6
1,207.5
1,217.4
1,220.1
1,227.5
1,232.5
1,236.6
1,239.7
1,261.0
1,263.8
1,272.4
1,290.5
1,153.7
1,156.2
1,163.1
1,175.0
1,181.7
1,188.6
1,193.2
1,196.1
1,201.6
1,208.3
1,218.2
1,220.7
1,227.9
1,233.4
1,236.8
1,240.0
1,261.3
1,264.8
1,273.4
1,290.9
0.9
0.9
0.4
0.3
0.0
0.8
0.5
0.9
1.0
0.8
0.8
0.6
0.4
0.9
0.2
0.3
0.3
1.0
1.0
0.4
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Elkhorn Creek
A
B
C
D
E
F
1
600
1
1,560
1
2,840
1
4,690
1
5,915
1
7,255
Hammond Creek
2
A
585
2
B
890
2
C
2,025
2
D
3,400
2
E
4,230
2
F
5,080
2
G
5,450
2
H
6,570
2
I
7,450
2
J
8,460
2
K
9,860
2
L
10,130
2
M
10,880
2
N
11,440
2
O
11,730
2
P
12,075
2
Q
13,845
2
R
14,225
2
S
15,430
2
T
16,820
1
Feet above confluence with Crooked Creek
2
Feet above Tioga - Bradford County Boundary
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
ELKHORN CREEK – HAMMOND CREEK
31
FLOODING SOURCE
CROSS SECTION
Hammond Creek
(continued)
U
V
W
X
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
17,640
1
19,080
1
20,010
1
20,520
1
39
42
27
50
245
268
206
374
14.3
12.6
15.7
5.9
1,301.7
1,325.0
1,339.6
1,350.4
1,301.7
1,325.0
1,339.6
1,350.4
1,302.1
1,325.0
1,340.0
1,350.8
0.4
0.0
0.4
0.4
1,062.6
1,112.2
0.1
0.0
999.1
1,004.5
1,004.7
1,005.0
1,008.3
1,019.1
1,036.2
1,061.8
1,094.1
1,125.4
1,144.0
0.0
0.7
0.8
1.0
0.7
0.9
0.0
0.0
0.0
0.0
0.0
Harrison Run
A
B
1,875
2
3,375
2
29
33
187
104
5.7
10.2
1,062.5
1,112.2
1,062.5
1,112.2
A
B
C
D
E
F
G
H
I
J
K
1,255
3
1,460
3
2,585
3
3,515
3
4,510
3
5,680
3
6,980
3
8,160
3
9,410
3
10,805
3
11,675
3
20
64
163
134
46
64
59
48
43
60
32
172
721
1,378
868
186
326
193
180
172
205
157
11.6
2.7
1.4
2.3
10.7
6.1
10.3
11.0
11.5
9.7
12.7
1,001.8
1,003.8
1,003.9
1,004.0
1,007.6
1,018.2
1,036.2
1,061.8
1,094.1
1,125.4
1,144.0
999.1
1,003.8
1,003.9
1,004.0
1,007.6
1,018.2
1,036.2
1,061.8
1,094.1
1,125.4
1,144.0
Harts Creek
4
1
Feet above Tioga - Bradford County Boundary
Feet above confluence with Babb Creek
3
4
Elevation computed without consideration of backwater effects from the Tioga River
2
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
HAMMOND CREEK – HARRISON RUN – HARTS CREEK
32
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Hoover Brook
A
B
C
D
E
F
G
H
I
J
290
1
760
1
905
1
1,025
1
1,265
1
1,775
1
2,210
1
2,465
1
2,885
1
3,475
1
31
110
70
81
37
78
50
19
27
12
134
360
115
211
118
181
162
88
80
69
6.7
2.5
7.8
4.3
7.6
5.0
5.6
8.0
8.8
10.1
1,326.4
1,333.6
1,337.0
1,338.1
1,341.2
1,348.7
1,357.9
1,362.7
1,370.9
1,386.3
1,326.4
1,333.6
1,337.0
1,338.1
1,341.2
1,348.7
1,357.9
1,362.7
1,370.9
1,386.3
1,327.3
1,334.6
1,337.0
1,339.0
1,341.2
1,349.7
1,358.9
1,363.7
1,371.9
1,387.3
0.9
1.0
0.0
0.9
0.0
1.0
1.0
1.0
1.0
1.0
A
B
C
D
E
F
G
H
I
325
2
685
2
1,185
2
1,845
2
2,360
2
2,450
2
2,805
2
3,780
2
4,545
2
224
60
141
80
65
80
115
100
132
2,246
458
586
417
375
631
572
495
544
1.7
8.2
6.4
9.0
10.0
5.9
6.5
7.6
6.9
1,337.4
1,338.0
1,341.2
1,349.0
1,355.2
1,359.4
1,361.4
1,369.5
1,377.2
1,337.4
1,338.0
1,341.2
1,349.0
1,355.2
1,359.4
1,361.4
1,369.5
1,377.2
1,338.4
1,339.0
1,342.2
1,350.0
1,356.2
1,360.4
1,362.4
1,370.5
1,378.2
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
Johnson Creek
1
2
Feet above confluence with Kelsey Creek
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
HOOVER BROOK – JOHNSON CREEK
33
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Kelsey Creek
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
1
615
1
1,470
1
1,905
1
2,445
1
2,615
1
3,220
1
3,530
1
3,805
1
4,010
1
4,080
1
4,455
1
4,955
1
5,300
1
5,555
1
6,045
146
95
30
41
57
24
33
34
*
*
*
*
19
27
27
442
488
244
284
356
184
191
211
127
162
240
143
139
180
124
4.9
4.4
8.8
7.2
5.8
11.1
10.7
7.6
12.6
9.9
6.7
10.1
10.4
8.1
11.7
1,288.5
1,297.2
1,300.9
1,305.6
1,309.4
1,314.4
1,316.2
1,319.0
1,321.0
1,321.3
1,328.2
1,330.7
1,335.5
1,338.7
1,344.1
1,288.5
1,297.2
1,300.9
1,305.6
1,309.4
1,314.4
1,316.2
1,319.0
1,321.0
1,321.3
1,328.2
1,330.7
1,335.5
1,338.7
1,344.1
1,289.5
1,297.8
1,301.1
1,306.6
1,309.6
1,314.4
1,316.3
1,320.0
1,321.0
1,322.3
1,329.0
1,331.6
1,336.2
1,339.3
1,344.1
1
Feet above confluence with Morris Branch
*Floodway contained in channel
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
KELSEY CREEK
34
1.0
0.6
0.2
1.0
0.2
0.0
0.1
1.0
0.0
1.0
0.8
0.9
0.7
0.6
0.0
FLOODING SOURCE
CROSS SECTION
Kelsey Creek (continued)
P
Q
R
S
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
6,570
1
6,865
1
7,390
1
8,155
1
28
17
14
13
149
88
39
42
9.7
4.0
9.0
8.3
1,352.7
1,357.8
1,364.4
1,378.0
1,352.7
1,357.8
1,364.4
1,378.0
1,353.7
1,358.8
1,364.5
1,379.0
1.0
1.0
0.1
1.0
Long Run No. 1
A
B
1,375
2
2,000
2
39
41
215
316
13.5
9.2
1,067.2
1,075.3
1,067.2
1,075.3
1,067.2
1,076.1
0.0
0.8
A
B
C
D
E
F
G
H
5,730
3
6,510
3
6,830
3
7,280
3
8,270
3
9,330
3
9,840
3
10,480
3
54
58
133
176
52
61
39
54
*
486
755
670
471
554
440
569
*
11.0
7.1
8.0
11.4
9.7
12.2
9.4
1,235.9
1,244.7
1,250.2
1,254.0
1,265.2
1,275.2
1,277.5
1,281.8
1,235.9
1,244.7
1,250.2
1,254.0
1,265.2
1,275.2
1,277.5
1,281.8
1,236.9
1,245.2
1,250.2
1,254.0
1,266.0
1,276.0
1,278.4
1,282.0
1.0
0.5
0.0
0.0
0.8
0.8
0.9
0.2
Marsh Creek
1
*
Feet above confluence with Morris Branch
3
Feet above Corky Road bridge
Data not available
2
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
KELSEY CREEK – LONG RUN NO. 1 – MARSH CREEK
35
FLOODING SOURCE
CROSS SECTION
Mill Creek No. 1
A
B
C
D
E
F
G
H
I
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
22,605
1
24,490
1
27,780
1
29,405
1
31,465
1
34,235
1
34,930
1
36,460
1
39,110
1
212
108
215
103
189
126
142
103
168
1,558
851
1,427
837
1,035
931
1,638
837
1,144
8.8
16.1
9.6
16.3
13.2
14.7
8.3
16.3
11.9
1,137.0
1,148.9
1,166.9
1,174.1
1,190.5
1,207.3
1,216.5
1,219.4
1,234.5
1,137.0
1,148.9
1,166.9
1,174.1
1,190.5
1,207.3
1,216.5
1,219.4
1,234.5
1,137.9
1,148.9
1,167.0
1,174.1
1,191.3
1,207.6
1,216.5
1,219.9
1,235.3
0.9
0.0
0.1
0.0
0.8
0.3
0.0
0.5
0.8
2
63
79
115
89
58
314
377
410
460
294
12.1
10.1
9.3
8.3
12.9
1,029.4
1,040.1
1,055.0
1,066.4
1,074.5
1,029.4
1,040.1
1,055.0
1,066.4
1,074.5
1,029.4
1,040.1
1,055.0
1,066.4
1,074.5
0.0
0.0
0.0
0.0
0.0
Mitchell Creek
A
B
C
D
E
1
2
1,715
2
2,675
2
3,645
2
4,415
2
4,865
Feet above Tioga Dam
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
MILL CREEK NO. 1 – MITCHELL CREEK
36
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Morris Branch
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
950
1
1,320
1
1,830
1
2,360
1
2,600
1
3,095
1
3,435
1
4,270
1
4,790
1
5,265
1
6,070
1
6,665
1
7,595
1
8,380
1
8,485
1
61
88
40
*
*
*
*
*
*
*
*
*
*
*
*
195
184
167
47
53
39
59
60
59
54
56
49
23
18
23
5.1
5.4
5.2
9.5
11.7
11.7
12.7
10.4
10.6
9.3
8.9
10.2
5.4
6.9
5.4
1,289.3
1,293.2
1,300.3
1,307.4
1,309.9
1,317.8
1,324.3
1,340.5
1,353.3
1,362.7
1,381.6
1,393.7
1,411.2
1,424.7
1,426.4
1,289.3
1,293.2
1,300.3
1,307.4
1,309.9
1,317.8
1,324.3
1,340.5
1,353.3
1,362.7
1,381.6
1,393.7
1,411.2
1,424.7
1,426.4
1,290.2
1,294.1
1,301.1
1,307.4
1,309.9
1,317.8
1,324.3
1,340.6
1,353.4
1,363.6
1,381.6
1,394.5
1,411.7
1,424.7
1,426.7
0.9
0.9
0.8
0.0
0.0
0.0
0.0
0.1
0.1
0.9
0.0
0.8
0.5
0.0
0.3
North Run No. 1
A
B
C
D
E
F
710
2
1,930
2
2,640
2
2,950
2
3,540
2
4,000
2
81
24
28
28
25
20
257
161
165
194
145
155
7.7
12.4
12.1
10.3
13.7
12.8
1,201.8
1,231.1
1,251.9
1,261.8
1,275.1
1,290.7
1,201.8
1,231.1
1,251.9
1,261.8
1,275.1
1,290.7
1,202.8
1,232.1
1,252.7
1,261.8
1,275.8
1,291.0
1.0
1.0
0.8
0.0
0.7
0.3
1
Feet above confluence with Hammond Creek
*Floodway contained in channel
2
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
MORRIS BRANCH – NORTH RUN NO. 1
37
FLOODING SOURCE
CROSS SECTION
Painter Run No. 1
A
B
C
D
E
F
G
(FEET NAVD 88)
FLOODWAY
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
1,135
1
2,100
1
3,045
1
4,045
1
5,195
1
6,061
1
6,576
1
50
54
58
37
33
80
26
190
182
187
161
155
740
144
10.1
10.5
10.3
11.9
12.4
2.6
13.4
1,235.1
1,259.3
1,284.9
1,301.4
1,337.0
1,371.0
1,374.0
1,235.1
1,259.3
1,284.9
1,301.4
1,337.0
1,371.0
1,374.0
1,236.0
1,259.3
1,284.9
1,301.8
1,337.0
1,371.9
1,374.0
0.9
0.0
0.0
0.4
0.0
0.9
0.0
DISTANCE
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Phoenix Run
A
B
C
D
E
F
G
830
2
1,230
2
2,210
2
3,270
2
3,930
2
4,510
2
5,100
2
93
115
69
288
67
98
119
618
519
436
1,164
430
515
810
9.3
11.1
13.2
4.9
13.3
11.1
7.1
1,276.7
1,278.6
1,289.5
1,299.0
1,304.7
1,314.2
1,319.7
1,276.7
1,278.6
1,289.5
1,299.0
1,304.7
1,314.2
1,319.7
1,276.7
1,279.0
1,289.5
1,300.0
1,305.7
1,314.2
1,320.3
0.0
0.4
0.0
1.0
1.0
0.0
0.6
A
B
C
D
E
F
G
125
3
3,125
3
5,000
3
6,175
3
9,800
4
24,300
4
25,330
3
411
417
355
528
307
267
373
5
6,314
5,334
5,448
6,886
4,228
3,322
4,037
7.6
9.0
8.8
7.0
11.4
8.7
7.2
850.1
855.7
859.8
863.9
870.2
1,189.0
1,191.6
850.1
855.7
859.8
863.9
870.2
1,189.0
1,191.6
851.1
856.4
860.5
864.8
870.9
1,190.0
1,192.5
1.0
0.7
0.7
0.9
0.7
1.0
0.9
Pine Creek
1
5
Feet above confluence with Mill Creek No. 1
Feet above confluence with Pine Creek
3
Feet above Tioga - Lycoming County Boundary
4
2
Floodway width extends beyond Tioga - Lycoming County Boundary
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
PAINTER RUN NO. 1 – PHOENIX RUN – PINE CREEK
38
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
1
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Pine Creek
(continued)
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
AB
AC
AD
AE
1
26,330
27,180
27,740
28,160
28,590
29,260
29,590
29,820
30,000
30,820
31,520
32,410
33,340
34,560
35,550
35,820
36,080
37,040
38,930
39,730
40,750
41,620
42,430
43,060
233
151
185
293
390
508
503
458
428
414
386
400
400
270
252
252
260
272
250
260
192
279
235
250
2,888
2,192
3,050
4,051
4,682
6,333
5,858
5,721
5,227
4,270
3,643
3,644
4,197
2,945
3,723
3,398
3,289
3,288
3,111
2,980
2,636
3,530
3,126
2,900
10.0
13.2
9.3
7.0
6.1
4.5
4.9
5.0
5.4
6.7
7.8
7.8
6.8
9.7
7.6
8.4
8.7
8.7
8.9
9.3
9.8
7.4
8.3
8.9
1,193.5
1,195.0
1,197.9
1,198.7
1,199.1
1,200.2
1,200.5
1,200.9
1,201.0
1,201.8
1,203.3
1,205.8
1,208.5
1,210.4
1,213.8
1,214.0
1,214.3
1,216.5
1,221.7
1,223.1
1,225.9
1,228.5
1,230.0
1,230.5
1,193.5
1,195.0
1,197.9
1,198.7
1,199.1
1,200.2
1,200.5
1,200.9
1,201.0
1,201.8
1,203.3
1,205.8
1,208.5
1,210.4
1,213.8
1,214.0
1,214.3
1,216.5
1,221.7
1,223.1
1,225.9
1,228.5
1,230.0
1,230.5
1,194.5
1,196.0
1,198.4
1,199.4
1,200.0
1,201.2
1,201.5
1,201.9
1,202.0
1,202.8
1,204.3
1,206.8
1,209.3
1,211.4
1,214.6
1,214.8
1,215.2
1,217.4
1,222.7
1,224.1
1,226.9
1,229.5
1,230.7
1,231.4
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
PINE CREEK
39
1.0
1.0
0.5
0.7
0.9
1.0
1.0
1.0
1.0
1.0
1.0
1.0
0.8
1.0
0.8
0.8
0.9
0.9
1.0
1.0
1.0
1.0
0.7
0.9
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
1
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Pine Creek
(continued)
AF
AG
AH
AI
AJ
AK
AL
AM
AN
AO
AP
AQ
AR
AS
AT
AU
AV
AW
AX
AY
AZ
1
44,060
44,870
45,190
45,450
46,080
46,900
48,130
49,880
50,850
52,150
53,530
56,040
57,520
57,970
58,370
59,000
59,200
59,840
60,200
61,170
62,010
360
210
385
370
475
439
250
742
670
200
249
208
382
270
269
418
396
369
288
384
250
3,613
2,579
4,254
3,897
4,086
3,566
2,586
5,930
4,697
2,075
2,830
2,721
3,670
2,980
3,283
3,859
4,151
3,809
2,708
2,891
2,255
7.2
10.1
6.1
6.7
6.3
7.3
10.0
4.4
5.5
12.5
9.2
8.8
6.5
8.0
7.3
6.2
5.7
6.3
8.8
7.5
9.7
1,232.7
1,234.1
1,236.2
1,236.3
1,237.6
1,238.8
1,241.1
1,245.9
1,247.3
1,250.6
1,256.5
1,261.9
1,265.3
1,266.1
1,267.9
1,269.2
1,270.2
1,271.5
1,271.7
1,273.7
1,275.5
1,232.7
1,234.1
1,236.2
1,236.3
1,237.6
1,238.8
1,241.1
1,245.9
1,247.3
1,250.6
1,256.5
1,261.9
1,265.3
1,266.1
1,267.9
1,269.2
1,270.2
1,271.5
1,271.7
1,273.7
1,275.5
1,233.7
1,235.1
1,236.9
1,237.2
1,238.3
1,239.7
1,241.9
1,246.9
1,248.3
1,251.6
1,257.3
1,262.4
1,266.0
1,267.0
1,268.8
1,270.2
1,270.8
1,272.0
1,272.2
1,274.3
1,276.3
Feet above confluence of Marsh Creek
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
PINE CREEK
40
1.0
1.0
0.7
0.9
0.7
0.9
0.8
1.0
1.0
1.0
0.8
0.5
0.7
0.9
0.9
1.0
0.6
0.5
0.5
0.6
0.8
FLOODING SOURCE
CROSS SECTION
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
Smith Creek
A
B
C
D
E
F
Tioga River Reach 1
A
B
C
D
E
F
G
H
I
J
K
L
M
N
1
270
1
670
1
1,300
1
1,800
1
2,400
1
3,280
2
119
2
1,495
2
2,495
2
3,525
2
4,555
2
5,965
2
7,395
2
8,725
2
10,295
2
11,995
2
13,335
2
14,840
2
16,695
2
17,950
37
52
71
46
45
56
194
3
997
3
1,067
3
1,463
1,518
188
421
930
1,121
801
600
916
1,130
360
198
243
323
166
165
175
9.1
7.4
5.6
10.8
10.9
10.3
1,001.8
1,004.2
1,011.2
1,029.2
1,042.7
1,066.3
997.8
1,004.2
1,011.2
1,029.2
1,042.7
1,066.3
2,756
5,936
7,787
7,610
6,105
1,472
3,561
7,466
7,994
5,681
5,550
4,391
7,412
2,835
8.7
2.8
2.1
2.2
2.7
11.4
4.7
2.2
1.9
2.7
2.7
3.4
2.0
5.3
991.8
992.9
993.3
993.5
993.8
999.2
1,001.2
1,001.6
1,001.8
1,001.9
1,002.2
1,002.5
1,002.9
1,003.3
991.8
992.9
993.3
993.5
993.8
999.2
1,001.2
1,001.6
1,001.8
1,001.9
1,002.2
1,002.5
1,002.9
1,003.3
4
998.8
1,004.7
1,011.8
1,029.2
1,042.7
1,066.3
1.0
0.5
0.6
0.0
0.0
0.0
991.8
993.6
993.9
994.1
994.3
999.2
1,001.2
1,001.6
1,001.8
1,001.9
1,002.2
1,002.5
1,002.9
1,003.3
0.0
0.7
0.6
0.6
0.5
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
1
Feet above confluence with Harts Creek
3
These widths consider adjustments made to ensure compliance with FEMA policy regarding the mapping of floodways on levees
4
Elevations computed without consideration of backwater effects from the Tioga River
2
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
SMITH CREEK – TIOGA RIVER REACH 1
41
FLOODING SOURCE
CROSS SECTION
Tioga River Reach 1
(continued)
O
P
Q
R
S
T
U
V
W
X
Y
Z
AA
AB
AC
AD
AE
AF
AG
AH
1
2
(FEET NAVD 88)
FLOODWAY
DISTANCE
19,220
20,740
21,780
23,040
24,160
25,230
26,345
27,275
28,645
30,175
31,875
33,935
35,250
36,305
37,485
39,125
39,615
41,355
42,840
44,770
1
WIDTH
(FEET)
703
492
722
930
1,138
910
827
610
268
229
156
233
142
310
372
304
2
284
2
292
2
284
2
378
SECTION
AREA
(SQUARE
FEET)
2,988
2,621
4,732
4,593
3,240
3,362
4,743
4,927
1,916
1,841
1,286
1,500
1,249
2,269
2,551
1,875
1,694
1,369
1,749
1,439
MEAN
VELOCITY
(FEET PER
SECOND)
5.1
5.8
3.2
3.3
4.7
4.5
3.2
3.1
4.4
4.6
6.6
5.7
6.8
3.7
3.3
4.5
5.0
6.2
4.9
5.9
REGULATORY
1,004.6
1,006.1
1,007.6
1,008.1
1,009.3
1,010.9
1,011.9
1,012.2
1,013.2
1,014.6
1,016.3
1,018.7
1,020.0
1,021.5
1,022.4
1,023.9
1,024.4
1,027.3
1,029.5
1,032.3
WITHOUT
FLOODWAY
1,004.6
1,006.1
1,007.6
1,008.1
1,009.3
1,010.9
1,011.9
1,012.2
1,013.2
1,014.6
1,016.3
1,018.7
1,020.0
1,021.5
1,022.4
1,023.9
1,024.4
1,027.3
1,029.5
1,032.3
WITH
FLOODWAY
1,004.8
1,006.6
1,008.4
1,009.0
1,009.9
1,011.5
1,012.5
1,012.8
1,013.7
1,014.9
1,016.4
1,018.7
1,020.2
1,021.6
1,022.5
1,024.0
1,024.5
1,027.3
1,029.5
1,032.3
These widths consider adjustments made to ensure compliance with FEMA policy regarding the mapping of floodways on levees
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
TIOGA RIVER REACH 1
42
INCREASE
0.2
0.5
0.8
0.9
0.6
0.6
0.6
0.6
0.5
0.3
0.1
0.0
0.2
0.1
0.1
0.1
0.1
0.0
0.0
0.0
FLOODING SOURCE
CROSS SECTION
Tioga River Reach 2
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
1
2
(FEET NAVD 88)
FLOODWAY
DISTANCE
5,275
9,445
9,635
11,730
13,750
15,350
17,340
19,100
19,330
20,630
22,150
23,355
24,340
24,590
25,180
25,550
26,340
27,575
28,235
29,450
30,560
31,895
32,395
1
WIDTH
(FEET)
585
592
894
181
547
335
243
474
447
213
1,053
385
276
754
648
597
425
451
360
803
332
394
200
2
SECTION
AREA
(SQUARE
FEET)
4,088
4,642
7,966
2,198
3,531
2,898
2,205
3,502
4,087
2,351
7,060
2,706
2,105
4,164
4,355
4,222
2,929
2,643
2,398
4,842
2,033
3,323
1,670
MEAN
VELOCITY
(FEET PER
SECOND)
6.9
6.1
3.2
11.5
7.2
8.7
11.5
5.8
5.0
8.7
2.9
7.5
9.3
4.7
4.5
4.6
6.7
7.4
8.1
4.0
9.6
5.7
11.3
REGULATORY
1,144.1
1,154.0
1,155.3
1,159.3
1,163.2
1,166.2
1,172.8
1,177.6
1,181.1
1,183.6
1,185.9
1,190.1
1,194.0
1,196.6
1,197.6
1,198.3
1,201.4
1,206.9
1,210.7
1,214.7
1,222.6
1,231.0
1,232.8
WITHOUT
FLOODWAY
1,144.1
1,154.0
1,155.3
1,159.3
1,163.2
1,166.2
1,172.8
1,177.6
1,181.1
1,183.6
1,185.9
1,190.1
1,194.0
1,196.6
1,197.6
1,198.3
1,201.4
1,206.9
1,210.7
1,214.7
1,222.6
1,231.0
1,232.8
WITH
FLOODWAY
1,145.1
1,155.0
1,156.3
1,160.3
1,164.2
1,167.2
1,173.8
1,178.6
1,182.1
1,184.6
1,186.9
1,191.1
1,195.0
1,197.6
1,198.6
1,199.3
1,202.4
1,207.9
1,211.7
1,215.7
1,223.6
1,232.0
1,233.8
Feet above U.S. Highway 6
This width considers adjustments made to ensure compliance with FEMA policy regarding the mapping of floodways on levees
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
TIOGA RIVER REACH 2
43
INCREASE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
FLOODING SOURCE
CROSS SECTION
Tioga River Reach 2
(continued)
X
Y
Z
AA
AB
AC
AD
AE
AF
AG
AH
AI
AJ
AK
AL
AM
AN
AO
AP
AQ
AR
1
(FEET NAVD 88)
FLOODWAY
DISTANCE
33,345
34,210
35,150
36,270
36,945
37,695
38,350
39,305
39,795
40,625
42,910
43,770
44,475
45,095
45,715
46,430
46,875
47,030
47,710
48,270
48,820
1
WIDTH
(FEET)
310
445
390
140
112
620
607
252
249
143
569
403
183
180
150
135
175
200
190
180
180
SECTION
AREA
(SQUARE
FEET)
1,834
2,483
2,452
1,355
1,269
4,042
3,970
1,932
1,832
1,420
3,349
2,667
1,629
1,473
1,289
1,418
1,655
2,588
1,854
1,516
1,511
MEAN
VELOCITY
(FEET PER
SECOND)
10.3
7.6
7.7
13.9
14.8
4.7
4.6
9.5
10.0
12.9
5.5
6.9
11.2
12.4
14.2
12.2
10.5
6.7
9.3
11.4
11.5
REGULATORY
1,239.0
1,243.4
1,248.7
1,255.7
1,259.7
1,263.2
1,264.9
1,270.8
1,275.0
1,280.3
1,290.4
1,294.2
1,297.9
1,301.7
1,305.8
1,308.2
1,309.6
1,313.2
1,314.4
1,316.1
1,318.2
WITHOUT
FLOODWAY
1,239.0
1,243.4
1,248.7
1,255.7
1,259.7
1,263.2
1,264.9
1,270.8
1,275.0
1,280.3
1,290.4
1,294.2
1,297.9
1,301.7
1,305.8
1,308.2
1,309.6
1,313.2
1,314.4
1,316.1
1,318.2
WITH
FLOODWAY
1,240.0
1,244.4
1,249.7
1,256.7
1,260.7
1,264.2
1,265.9
1,271.8
1,276.0
1,281.3
1,291.4
1,295.2
1,298.9
1,302.7
1,306.8
1,309.2
1,310.6
1,314.2
1,315.4
1,317.1
1,319.2
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
TIOGA RIVER REACH 2
44
INCREASE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
FLOODING SOURCE
CROSS SECTION
Tioga River Reach 2
(continued)
AS
AT
AU
AV
AW
AX
AY
AZ
BA
BB
BC
BD
BE
BF
BG
BH
BI
BJ
BK
BL
BM
BN
1
(FEET NAVD 88)
FLOODWAY
DISTANCE
49,290
49,695
50,250
50,520
50,850
51,200
51,410
51,720
52,020
52,710
53,180
53,655
54,395
54,795
55,015
55,410
55,810
56,505
57,150
58,880
59,080
60,680
1
WIDTH
(FEET)
185
130
135
110
171
130
80
105
112
333
300
145
150
165
135
165
175
140
135
185
240
145
SECTION
AREA
(SQUARE
FEET)
1,506
1,218
1,440
1,215
1,980
1,841
1,101
1,704
1,559
2,823
1,621
1,294
1,347
1,249
1,257
1,337
1,330
1,092
1,072
1,468
2,418
1,198
MEAN
VELOCITY
(FEET PER
SECOND)
11.5
14.2
12.0
14.2
8.7
9.4
15.7
10.2
11.1
6.1
10.7
10.7
10.3
11.1
11.1
10.4
10.5
12.7
13.0
9.5
5.6
11.6
REGULATORY
1,320.0
1,321.8
1,324.6
1,325.7
1,330.3
1,330.8
1,330.8
1,333.5
1,334.1
1,337.3
1,338.9
1,341.8
1,346.9
1,350.1
1,353.0
1,355.2
1,358.6
1,366.1
1,372.6
1,383.7
1,389.3
1,398.5
WITHOUT
FLOODWAY
1,320.0
1,321.8
1,324.6
1,325.7
1,330.3
1,330.8
1,330.8
1,333.5
1,334.1
1,337.3
1,338.9
1,341.8
1,346.9
1,350.1
1,353.0
1,355.2
1,358.6
1,366.1
1,372.6
1,383.7
1,389.3
1,398.5
WITH
FLOODWAY
1,321.0
1,322.8
1,325.6
1,326.7
1,331.3
1,331.8
1,331.8
1,334.5
1,335.1
1,338.3
1,339.9
1,342.8
1,347.9
1,351.1
1,354.0
1,356.2
1,359.6
1,367.1
1,373.6
1,384.7
1,390.3
1,399.5
TABLE 7
FLOODWAY DATA
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
TIOGA RIVER REACH 2
45
INCREASE
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
FLOODING SOURCE
CROSS SECTION
Tributary No. 1 to
Charleston Creek
A
B
(FEET NAVD 88)
FLOODWAY
DISTANCE
WIDTH
(FEET)
SECTION
AREA
(SQUARE
FEET)
MEAN
VELOCITY
(FEET PER
SECOND)
REGULATORY
WITHOUT
FLOODWAY
WITH
FLOODWAY
INCREASE
285
1
925
1
16
33
100
103
8.5
8.3
1,326.6
1,340.9
1,326.6
1,340.9
1,327.6
1,341.0
1.0
0.1
2
47
71
120
105
393
544
427
455
11.7
8.5
10.8
10.1
1,031.4
1,047.1
1,068.2
1,108.7
1,031.4
1,047.1
1,068.2
1,108.7
1,032.4
1,048.1
1,068.2
1,108.8
1.0
1.0
0.0
0.1
Wilson Creek
A
B
C
D
1
2
1,375
2
2,875
2
4,500
2
7,200
Feet above confluence with Charleston Creek
TABLE 7
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
FLOODWAY DATA
TRIBUTARY NO. 1 TO CHARLESTON CREEK –
WILSON CREEK
46
5.0
INSURANCE APPLICATIONS
For flood insurance rating purposes, flood insurance zoning designations are assigned to a
community based on the results of the engineering analyses. The zones are as follows:
Zone A
Zone A is the flood insurance risk zone that corresponds to the
1-percent-annual-chance floodplains that are determined in the FIS by approximate
methods. Because detailed hydraulic analyses are not performed for such areas, no
BFEs or base flood depths are shown within this zone.
Zone AE
Zone AE is the flood insurance risk zone that corresponds to the
1-percent-annual-chance floodplains that are determined in the FIS by detailed
methods. In most instances, whole-foot BFEs derived from the detailed hydraulic
analyses are shown at selected intervals within this zone.
Zone AH
Zone AH is the flood insurance risk zone that corresponds to the areas of
1-percent-annual-chance shallow flooding (usually areas of ponding) where average
depths are between 1 and 3 feet. Whole-foot BFEs derived from the detailed
hydraulic analyses are shown at selected intervals within this zone.
Zone AO
Zone AO is the flood insurance risk zone that corresponds to the areas of
1-percent-annual-chance shallow flooding (usually sheet flow on sloping terrain)
where average depths are between 1 and 3 feet. Average whole-foot base flood
depths derived from the detailed hydraulic analyses are shown within this zone.
Zone AR
Zone AR is the flood insurance risk zone that corresponds to an area of special flood
hazard formerly protected from the 1-percent-annual-chance flood event by a
flood-control system that was subsequently decertified. Zone AR indicates that the
former flood-control system is being restored to provide protection from the
1-percent-annual-chance or greater flood event.
Zone A99
Zone A99 is the flood insurance risk zone that corresponds to areas of the
1-percent-annual-chance floodplain that will be protected by a Federal flood
protection system where construction has reached specified statutory milestones. No
BFEs or depths are shown within this zone.
47
Zone V
Zone V is the flood insurance risk zone that corresponds to the
1-percent-annual-chance coastal floodplains that have additional hazards associated
with storm waves. Because approximate hydraulic analyses are performed for such
areas, no BFEs are shown within this zone.
Zone VE
Zone VE is the flood insurance risk zone that corresponds to the
1-percent-annual-chance coastal floodplains that have additional hazards associated
with storm waves. Whole-foot BFEs derived from the detailed hydraulic analyses are
shown at selected intervals within this zone.
Zone X
Zone X is the flood insurance risk zone that corresponds to areas outside the
0.2-percent-annual-chance floodplain, areas within the 0.2-percent-annual-chance
floodplain, areas of 1-percent-annual-chance flooding where average depths are less
than 1 foot, areas of 1-percent-annual-chance flooding where the contributing
drainage area is less than 1 square mile, and areas protected from the
1-percent-annual-chance flood by levees. No BFEs or base flood depths are shown
within this zone.
Zone X (Future Base Flood)
Zone X (Future Base Flood) is the flood insurance risk zone that corresponds to the
1-percent-annual-chance floodplains that are determined based on future-conditions
hydrology. No BFEs or base flood depths are shown within this zone.
Zone D
Zone D is the flood insurance risk zone that corresponds to unstudied areas where
flood hazards are undetermined, but possible.
6.0
FLOOD INSURANCE RATE MAP
The FIRM is designed for flood insurance and floodplain management applications.
For flood insurance applications, the map designates flood insurance rate zones as described
in Section 5.0 and, in the 1-percent-annual-chance floodplains that were studied by detailed
methods, shows selected whole-foot base flood elevations or average depths. Insurance
agents use the zones and base flood elevations in conjunction with information on structures
and their contents to assign premium rates for flood insurance policies.
For floodplain management applications, the map shows by tints, screens and symbols, the
1-percent-annual-chance floodplains and the location of the selected cross sections used in
the hydraulic analyses.
48
The countywide FIRM presents flooding information for the entire geographic area of Tioga
County. Previously, separate Flood Hazard Boundary Maps and/or FIRMS were prepared for
each identified flood-prone community within the county. This countywide FIRM also
includes flood hazard information that was presented separately on Flood Boundary and
Floodway Maps (FBFMs) where applicable. Historical data relating to the maps prepared for
each flood-prone community, prior to the initial countywide FIRM, are presented in Table 8,
“Community Map History.”
7.0
OTHER STUDIES
FISs have been prepared for the following communities: the Towns of Lindley (FEMA,
1980) and Woodhull (FEMA, 1991), Steuben County, New York; the Town of Southport
(FEMA, 1991), Chemung County, New York; and Bradford, Lycoming, and Potter County,
Pennsylvania (all currently under revision).
Information pertaining to revised and unrevised flood hazards for each jurisdiction within
Tioga County has been compiled into this countywide FIS. Therefore, this FIS either
supersedes or is compatible with all previous studies published on streams studied in this
report and should be considered authoritative for the purposes of the NFIP.
8.0
LOCATION OF DATA
Information concerning the pertinent data used in the preparation of this FIS can be obtained
by contacting FEMA, Federal Insurance and Mitigation Division, One Independence Mall,
Sixth Floor, 615 Chestnut Street, Philadelphia, Pennsylvania 19106-4404.
9.0
BIBLIOGRAPHY AND REFERENCES
1.
Federal Emergency Management Agency, Flood Insurance Study, Borough of
Blossburg, Tioga County, Pennsylvania, Washington D.C., January 1980.
2.
Federal Emergency Management Agency, Flood Insurance Study, Township of
Covington, Tioga County, Pennsylvania, Washington D.C., January 1980.
3.
Delmar, Tioga County, Pennsylvania, Washington D.C., August 15, 1990.
4.
Elkland, Tioga County, Pennsylvania, Washington D.C., September 28, 1990.
49
INITIAL
IDENTIFICATION
FLOOD HAZARD
BOUNDARY MAP
REVISIONS DATE
FIRM
EFFECTIVE DATE
Bloss, Township of
December 27, 1974
None
March 1, 1987
Blossburg, Borough of
November 30, 1973
February 20, 1976
July 16, 1980
Brookfield, Township of
October 18, 1974
June 4, 1976
December 1, 1986
Charleston, Township of
March 28, 1975
March 14, 1980
December 1, 1986
November 22, 1974
July 16, 1976
June 1, 1987
Clymer, Township of
January 17, 1975
November 7, 1980
May 1, 1987
Covington, Township of
August 30, 1974
September 17, 1976
July 16, 1980
Deerfield, Township of
August 30, 1974
May 21, 1976
June 1, 1987
Delmar, Township of
April 4, 1975
None
August 15, 1990
Duncan, Township of
November 1, 1974
None
March 1, 1987
Elk, Township of
July 22, 1977
None
May 1, 1987
Elkland, Borough of
March 8, 1974
April 16, 1976
April 3, 1981
None
September 28, 1990
COMMUNITY
NAME
Chatham, Township of
Elkland, Township of*
November 22, 1974
April 1, 1986
FIRM
REVISIONS DATE
November 2, 1990
TABLE 8
TIOGA COUNTY, PA
COMMUNITY MAP HISTORY
(ALL JURISDICTIONS)
Table 8 – Community Map History
50
INITIAL
IDENTIFICATION
FLOOD HAZARD
BOUNDARY MAP
REVISIONS DATE
FIRM
EFFECTIVE DATE
January 3, 1975
None
December 1, 1986
June 14, 1974
July 30, 1976
September 1, 1978
August 30, 1974
June 18, 1976
December 1, 1986
Jackson, Township of
December 21, 1973
None
September 1, 1978
Knoxville, Borough of
December 3, 1976
None
December 1, 1986
Lawrence, Township of
March 8, 1974
December 24, 1976
September 3, 1980
Lawrenceville, Borough of
September 14, 1973
September 24, 1976
December 31, 1976
August 15, 1980
Liberty, Borough of
September 13, 1974
June 11, 1976
March 1, 1987
Liberty, Township of
April 4, 1975
August 22, 1980
July 1, 1987
September 20, 1974
August 6, 1976
July 1, 1987
Morris, Township of
January 28, 1977
None
September 3, 1980
Nelson, Township of
September 6, 1974
September 10, 1976
December 1, 1986
Osceola, Township of
September 20, 1974
May 21, 1976
August 19, 1991
COMMUNITY
NAME
Farmington, Township of
Gaines, Township of
Hamilton, Township of
FIRM
REVISIONS DATE
October 16, 1984
Mansfield, Borough of
Middlebury, Township of
TABLE 8
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
51
INITIAL
IDENTIFICATION
FLOOD HAZARD
BOUNDARY MAP
REVISIONS DATE
FIRM
EFFECTIVE DATE
February 1, 1974
October 1, 1976
July 2, 1980
May 3, 1974
May 21, 1976
July 2, 1980
Roseville, Borough of
December 13, 1974
November 28, 1980
August 1, 1987
Rutland, Township of
January 17, 1975
None
August 1, 1987
Shippen, Township of
November 29, 1974
None
December 1, 1986
Sullivan, Township of
January 3, 1975
None
March 1, 1987
Tioga, Borough of
June 22, 1973
April 30, 1976
May 1, 1988
Tioga, Township of
February 8, 1974
January 7, 1977
January 13, 1978
August 15, 1980
Union, Township of
January 17, 1975
May 23, 1980
February 1, 1987
Ward, Township of
July 1, 1977
None
July 1, 1987
Wellsboro, Borough of
March 22, 1974
August 20, 1976
April 15, 1981
Westfield, Borough of
September 20, 1974
May 28, 1976
March 1, 1987
Westfield, Township of
September 20, 1974
July 30, 1976
March 1, 1987
COMMUNITY
NAME
Putnam, Township of
Richmond, Township of
FIRM
REVISIONS DATE
TABLE 8
TIOGA COUNTY, PA
(ALL JURISDICTIONS)
52
5.
Elkland, Tioga County, Pennsylvania, Washington D.C., Initial: April 1, 1986,
Revised: November 2, 1990.
6.
U.S. Department of Housing and Urban Development, Federal Insurance
Administration, Flood Insurance Study, Township of Gaines, Tioga County,
Pennsylvania, Washington D.C., March 1978.
7.
U.S. Department of Housing and Urban Development, Federal Insurance
Administration, Flood Insurance Study, Township of Jackson, Tioga County,
Pennsylvania, Washington D.C., March 1978.
8.
Lawrence, Tioga County, Pennsylvania, Washington D.C., March 1980.
9.
Lawrenceville, Tioga County, Pennsylvania, Washington D.C., February 1980.
10.
Morris, Tioga County, Pennsylvania, Washington D.C., March 1980.
11.
Osceola, Tioga County, Pennsylvania, Washington D.C., August 19, 1991.
12.
Putnam, Tioga County, Pennsylvania, Washington D.C., January 1980.
13.
Richmond, Tioga County, Pennsylvania, Washington D.C., January 1980.
14.
Tioga, Tioga County, Pennsylvania, Washington D.C., February 1980.
15.
Wellsboro, Tioga County, Pennsylvania, Washington D.C., October 15, 1980.
16.
U.S. Census Bureau, State and County Quickfacts, http://quickfacts.census.gov,
December 20, 2006.
17.
The Weather Channel Interactive, Inc. Monthly Averages for Wellsboro,
Pennsylvania, www.weather.com, 2006, December 20, 2006.
18.
Wellsboro Chamber of Commerce, Historical Highlights of Wellsboro, Press of
Wellsboro Gazette, Wellsboro, PA, 1930.
19.
Commonwealth of Pennsylvania, Department of Forests and Waters, Water
Resources Bulletin No. 5, Dams, Reservoirs and Natural Lakes, Harrisburg,
Pennsylvania, 1970.
20.
U.S. Department of Housing and Urban Development, Code of Federal
Regulations, Government Printing Office, Washington D.C., April 1, 1973.
53
21.
John McSparren’s Equation for Calculating Time to Peak, Tp, as described in
ASCE “Journal of the Hydraulics Division”, July 1968, Pages 937-960, Design
Hydrographs for Pennsylvania Watersheds.
22.
Commonwealth of Pennsylvania, Department of Environmental Resources, in
Cooperation with the U.S. Geological Survey, Water Resources Bulletin No. 13,
Flood in Pennsylvania, A Manual of Estimation of Their Magnitude and
Frequency by Herbert J. Flippo, Jr., Harrisburg, Pennsylvania, October 1972.
23.
U.S. Department of Agriculture, Soil Conservation Service, National Engineering
Handbook, Section 4, Hydrology, Washington D.C., 1964.
24.
U.S. Department of the Interior, Bureau of Reclamation, Design of Small Dams,
Washington D.C., 1973.
25.
U.S. Department of Commerce, Weather Bureau, Technical Paper No. 40, Rainfall
Frequency Atlas of the United States, Washington D.C., 1961, Revised 1963.
26.
U.S. Department of the Interior, Geological Survey, Water Resources
Investigations 82-21, Evaluation of Streamflow – Data Program in Pennsylvania
by H.N. Flippo, Jr., Harrisburg, Pennsylvania, 1982.
27.
U.S. Army Corps of Engineer, Baltimore District, General Design Memorandum
No. 1, Elkland, Pennsylvania Flood Control Project, Baltimore, Maryland, 1961.
28.
U.S. Army Corps of Engineers, New York District, Hydrologic Study, Tropical
Storm Agnes, New York, December 1975.
29.
U.S. Department of Agriculture, Soil Conservation Service, Pennsylvania
Technical Guidance, Washington D.C., March 1970.
30.
U.S. Department of Agriculture, Soil Conservation Service, Engineering Division,
Technical Release No. 20, Computer Program for Project Formulation Hydrology,
Washington D.C., May 1965.
31.
U.S. Army Corps of Engineers, Hydrologic Engineering Center, HEC-2 Water
Surface Profiles, Generalized Computer Program, Davis, California, April 1984.
32.
U.S. Army Corps of Engineers, Hydrologic Engineering Center, HEC-2 Water
Surface Profiles, Users Manual, Davis, California, April 1984.
33.
U.S. Federal Highway Administration, Report FHWA/RD-86/108, Bridge
Waterways Analysis Model/Research Report by J.O. Shearman, W.H. Kirby, V.R.
Schneider and H.N. Flippo, Jr., Washington D.C., 1986.
34.
National Technical Information Service, Bridge Waterways Analysis
Model/User’s Instructions by J.O. Shearman, W.H. Kirby and V.R. Schneider,
Springfield, Virginia, 1985.
35.
U.S. Department of the Interior, Geological Survey, Water Resources
Investigations 86-4195, Technique for Estimating Depths of 100-Year Floods in
Pennsylvania by H.N. Flippo, Jr., Harrisburg, Pennsylvania, 1986.
54
36.
U.S. Department of Agriculture, Soil Conservation Service, Engineering Division,
Technical Release No. 61, WSP-2 Computer Program, Washington D.C., May
1976.
37.
Aerial Mapping, Buchart-Horn, Inc., Scale 1:9,600, November 14, 1988.
38.
Commonwealth of Pennsylvania, Department of Highways, Topographic Maps,
LR-21 and 196, Scale 1:2,400, Contour Interval 5 Feet, Tioga County,
Pennsylvania, Harrisburg, Pennsylvania, December 1965.
39.
U.S. Department of the Interior, Geological Survey, Techniques of
Water-Resources Investigations, Measurement of Peak Discharges at Culverts by
Indirect Methods by G.L. Bodhaine, Washington D.C., 1968.
40.
Ven Te Chow, Open-Channel Hydraulics, New York, McGraw-Hill, 1959.
41.
Federal Emergency Management Agency, Converting the National Flood
Insurance Program to the North American Vertical Datum of 1988, Washington
D.C., 1992.
42.
Commonwealth of Pennsylvania, Department of Highways, Topographic Maps,
LR-21 and 196, Scale 1:2,400, Contour Interval 5 Feet: Tioga County,
Pennsylvania, Harrisburg, Pennsylvania, December 1965.
43.
U.S. Department of the Interior, Geological Survey, 7.5-Minute Series
Topographic Maps, Scale 1:24,000, Contour Interval 20 Feet: Antrim,
Pennsylvania, 1946, Photorevised 1971 and 1986; Asaph, PA 1954, Photorevised
1969; Canton, New York-Pennsylvania, 1969; Cedar Run, Pennsylvania
(Unpublished); Cherry Flats, Pennsylvania (Unpublished); Crooked, Pennsylvania,
1969; Elkland, Pennsylvania, 1954, Photorevised 1969; Jackson Summit, New
York-Pennsylvania, 1969; Keeneyville, Pennsylvania, 1954, Photorevised 1969;
Mansfield, Pennsylvania, 1969; Marshlands, Pennsylvania, 1947, Photorevised
1971; Millerton, Pennsylvania, 1969; Morris, Pennsylvania (Unpublished);
Nauvoo, Pennsylvania (Unpublished); Sabinsville, Pennsylvania, 1969;
Tiadaghton, Pennsylvania, 1946, Photorevised 1971; Tioga, Pennsylvania, 1969;
Contour Interval 10 Feet: Seely Creek, New York-Pennsylvania, 1953.
44.
Aerial Mapping, Buchart-Horn, Inc., November 14, 1988, Scale 1:9,600.
55
1270
1265
1265
1260
1260
1255
1255
LEGEND
0.2% ANNUAL CHANCE FLOOD
1% ANNUAL CHANCE FLOOD
1250
STREAM BED
A
B
CROSS SECTION LOCATION
1245
0
100
200
300
400
500
600
700
800
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH HAMMOND CREEK
900
1000
1100
1200
1300
ALDER RUN
1270
01P
(ALL JURISDICTIONS)
1275
TIOGA COUNTY, PA
1275
FLOOD PROFILES
1280
ELEVATION IN FEET (NAVD 88)
1280
1285
STATE ROUTE 328
1285
1290
CONFLUENCE WITH HAMMOND CREEK
1290
1305
1300
1300
1295
1295
1290
1290
1285
1285
1280
1280
LEGEND
1275
STREAM BED
C
1270
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
ALDER RUN
1305
02P
(ALL JURISDICTIONS)
1310
TIOGA COUNTY, PA
1310
FLOOD PROFILES
1315
1315
1335
1330
1330
1325
1325
1320
1320
1315
1315
E
1310
1310
LEGEND
1305
STREAM BED
D
1300
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
ALDER RUN
1335
03P
(ALL JURISDICTIONS)
1340
TIOGA COUNTY, PA
1340
FLOOD PROFILES
1345
1345
1365
1360
1360
1355
1355
1350
1350
1345
1345
1340
1340
LEGEND
1335
STREAM BED
F
1330
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
4800
4900
5000
5100
ALDER RUN
1365
04P
(ALL JURISDICTIONS)
1370
TIOGA COUNTY, PA
1370
FLOOD PROFILES
1375
1375
1390
1385
1385
1380
1380
1375
1375
1370
1370
I
1365
1365
LEGEND
1360
STREAM BED
G
1355
5100
5200
5300
5400
H
5500
5600
5700
5800
5900
6000
6100
6200
6300
6400
ALDER RUN
1390
05P
(ALL JURISDICTIONS)
1395
TIOGA COUNTY, PA
1395
FLOOD PROFILES
1400
1400
1405
1400
1400
1395
1395
1390
1390
1385
1380
1385
LEGEND
STREAM BED
I
1375
6400
J
6500
6600
6700
6800
6900
7000
7100
7200
7300
7400
7500
7600
7700
ALDER RUN
1405
06P
(ALL JURISDICTIONS)
1410
LIMIT OF DETAILED STUDY
1410
TIOGA COUNTY, PA
1415
FLOOD PROFILES
1415
1420
COOK ROAD
1420
880
880
860
855
855
850
850
845
845
LEGEND
840
STREAM BED
A
835
0
200
400
600
800
1000
1200
1400
1600
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH PINE CREEK
1800
2000
2200
2400
2600
BABB CREEK
860
07P
(ALL JURISDICTIONS)
865
TIOGA COUNTY, PA
865
FLOOD PROFILES
870
STATE ROUTE 414
870
875
875
CONFLUENCE WITH PINE CREEK
1% ANNUAL CHANCE BACKWATER FROM PINE CREEK
880
875
875
860
860
855
855
850
850
LEGEND
845
STREAM BED
B
840
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
5200
08P
(ALL JURISDICTIONS)
865
TIOGA COUNTY, PA
865
870
870
BABB CREEK
880
FLOOD PROFILES
885
885
1000
1000
995
995
990
990
D
985
985
LEGEND
980
STREAM BED
C
975
27400
27600
27800
28000
28200
28400
28600
28800
29000
29200
29400
29600
29800
30000
BABB CREEK
1005
09P
(ALL JURISDICTIONS)
1005
FLOOD PROFILES
1010
TIOGA COUNTY, PA
1010
1015
1015
1020
1020
1035
CONFLUENCE OF HARRISON RUN
1035
1020
1015
1015
1005
1005
1000
1000
LEGEND
995
STREAM BED
E
990
30000
30200
30400
30600
F
30800
31000
31200
31400
31600
31800
32000
32200
32400
32600
10P
(ALL JURISDICTIONS)
1010
TIOGA COUNTY, PA
1010
BABB CREEK
1020
FLOOD PROFILES
1025
CONFLUENCE OF
WILSON CREEK
1025
1030
1030
1035
1035
1030
1030
1025
1025
1020
1020
G
1015
1015
1010
LEGEND
STREAM BED
1005
32600
32800
33000
33200
33400
33600
33800
34000
34200
34400
34600
34800
35000
35200
BABB CREEK
1040
11P
(ALL JURISDICTIONS)
1040
TIOGA COUNTY, PA
1045
FLOOD PROFILES
1045
1050
STATE ROUTE 287
1050
1050
1045
1045
1040
1040
1035
1035
1025
1020
1020
LEGEND
1015
STREAM BED
H
1010
35200
35400
35600
35800
36000
36200
36400
36600
36800
37000
37200
37400
37600
37800
12P
(ALL JURISDICTIONS)
1025
TIOGA COUNTY, PA
1030
1030
BABB CREEK
1050
FLOOD PROFILES
1055
CONFLUENCE OF
LONG RUN NO. 1
1055
1070
1070
1050
1050
1045
1045
1040
1040
1035
1035
LEGEND
1030
STREAM BED
I
1025
37400
37600
37800
38000
38200
38400
38600
38800
39000
39200
39400
39600
39800
40000
BABB CREEK
1055
13P
(ALL JURISDICTIONS)
1055
FLOOD PROFILES
1060
TIOGA COUNTY, PA
1060
1065
1065
1040
THE 2% ANNUAL CHANCE FLOOD PROFILE
IS TOO CLOSE TO THE 1% ANNUAL
CHANCE PROFILE TO BE SHOWN SEPARATELY.
1030
1030
C
1020
1020
LEGEND
1010
STREAM BED
A
B
1000
0
200
400
600
800
1000
1200
1400
1600
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH TIOGA RIVER REACH 1
1800
2000
2200
2400
2600
14P
(ALL JURISDICTIONS)
1040
TIOGA COUNTY, PA
1050
BEAR CREEK NO. 1
FLOOD PROFILES
TIOGA RIVER ROAD
(TR-722)
1050
CONFLUENCE WITH
TIOGA RIVER REACH 1
1% ANNUAL CHANCE BACKWATER
FROM TIOGA RIVER REACH 1
1080
1070
1070
1060
1060
1050
1050
LEGEND
1040
STREAM BED
D
1030
2600
2800
3000
E
3200
3400
F
3600
3800
4000
4200
4400
4600
BEAR CREEK NO. 1
1080
15P
(ALL JURISDICTIONS)
1090
TIOGA COUNTY, PA
1090
1100
FLOOD PROFILES
RAILROAD
1100
1110
1100
1100
LEGEND
1090
STREAM BED
G
1080
4600
4800
5000
5200
5400
BEAR CREEK NO. 1
16P
(ALL JURISDICTIONS)
1110
TIOGA COUNTY, PA
1120
FLOOD PROFILES
1120
1045
1045
1025
1020
1020
1015
1015
C
1010
1010
LEGEND
1005
STREAM BED
A
B
1000
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
BENTLEY CREEK
1025
17P
(ALL JURISDICTIONS)
1030
TIOGA COUNTY, PA
1030
FLOOD PROFILES
1035
1035
1040
STATE ROUTE 287
(OLD US ROUTE 15)
1040
CONFLUENCE WITH
TIOGA RIVER REACH 1
1% ANNUAL CHANCE BACKWATER FROM TIOGA RIVER REACH 1
1065
1060
1060
1055
1055
1050
1050
1045
1045
1040
1040
LEGEND
1035
STREAM BED
D
1030
1300
1400
1500
1600
1700
1800
1900
2000
2100
2200
2300
2400
2500
2600
BENTLEY CREEK
1065
18P
(ALL JURISDICTIONS)
1070
TIOGA COUNTY, PA
1070
FLOOD PROFILES
1075
1075
1090
1085
1085
1080
1080
1075
1075
1070
1070
1065
1065
LEGEND
1060
STREAM BED
1055
2600
2700
2800
2900
3000
3100
3200
3300
3400
3500
3600
3700
3800
3900
BENTLEY CREEK
1090
19P
(ALL JURISDICTIONS)
1095
TIOGA COUNTY, PA
1095
FLOOD PROFILES
1100
1100
1120
1120
1100
1100
1095
1095
1090
1090
1085
1085
LEGEND
1080
STREAM BED
E
1075
3400
3500
3600
3700
3800
3900
4000
4100
4200
4300
4400
4500
4600
4700
BENTLEY CREEK
1105
20P
(ALL JURISDICTIONS)
1105
FLOOD PROFILES
1110
TIOGA COUNTY, PA
1110
1115
1115
1370
1365
1365
1360
1360
1355
1355
LEGEND
1350
STREAM BED
A
B
1345
0
200
400
600
800
1000
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH KELSEY CREEK
BOYDEN BROOK
1370
21P
(ALL JURISDICTIONS)
1375
TIOGA COUNTY, PA
1375
FLOOD PROFILES
1380
1380
1385
KELSEY STREET
CONFLUENCE WITH KELSEY CREEK
1385
1400
1395
1395
1390
1390
1385
1385
1380
1380
LEGEND
1375
STREAM BED
C
1370
1000
D
1200
1400
1600
1800
2000
BOYDEN BROOK
1400
22P
(ALL JURISDICTIONS)
1405
TIOGA COUNTY, PA
1405
FLOOD PROFILES
1410
1410
1420
1415
1415
1410
1410
1405
1405
LEGEND
1400
STREAM BED
E
1395
2000
F
2200
2400
2600
2800
BOYDEN BROOK
1420
23P
(ALL JURISDICTIONS)
1425
TIOGA COUNTY, PA
1425
FLOOD PROFILES
LIMIT OF STUDY
GREENWOOD STREET
1430
1430
1180
1180
1150
1150
1140
1140
1130
1130
CAMP BROOK CREEK
1160
FLOOD PROFILES
NORTH BUFFALO STREET
TANNERY STREET
CONFLUENCE OF KIZER CREEK
1170
1120
1110
1110
LEGEND
0.2% ANNUAL CHANCE FLOOD*
2% ANNUAL CHANCE FLOOD*
1100
B
D
A
STREAM BED
C
E
F
1090
0
1000
2000
3000
4000
5000
6000
7000
8000
9000
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH COWANESQUE RIVER REACH 2
10000
11000
12000
*DATA NOT AVAILABLE
13000
24P
(ALL JURISDICTIONS)
1120
TIOGA COUNTY, PA
CULVERT
1160
ELLISON ROAD
(LR-58130)
1170
EAST MAIN STREET
FLOODING CONTROLLED BY COWANESQUE RIVER REACH 2
1315
1315
1310
1295
1290
1290
1285
1285
C
1280
1280
LEGEND
1275
STREAM BED
A
B
1270
0
200
400
600
800
1000
1200
1400
1600
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH MARSH CREEK
1800
2000
2200
2400
2600
CHARLESTON CREEK
1295
25P
(ALL JURISDICTIONS)
1300
TIOGA COUNTY, PA
1300
FLOOD PROFILES
1305
1305
FLOODING CONTROLLED
BY MORRIS BRANCH
RAILROAD
CONFLUENCE WITH
MARSH CREEK
1310
CHARLESTON STREET
(BACON STREET)
1% ANNUAL CHANCE BACKWATER
FROM MORRIS BRANCH
1335
1315
1310
1310
1305
1305
F
G
1300
1300
LEGEND
1295
STREAM BED
D
1290
2600
2800
3000
3200
3400
E
3600
3800
4000
4200
4400
4600
4800
5000
5200
CHARLESTON CREEK
1315
26P
(ALL JURISDICTIONS)
1320
TIOGA COUNTY, PA
1320
FLOOD PROFILES
1325
1325
1330
DAM
JACKSON STREET
1330
CONFLUENCE OF TRIBUTARY NO. 1
TO CHARLESTON CREEK
1335
1350
1350
1330
1330
1325
1325
1320
1320
1315
1315
LEGEND
1310
STREAM BED
1305
5000
5200
5400
5600
5800
6000
6200
6400
6600
6800
7000
7200
7400
7600
CHARLESTON CREEK
1335
27P
(ALL JURISDICTIONS)
1335
FLOOD PROFILES
1340
TIOGA COUNTY, PA
1340
1345
1345
1050
PENNSYLVANIA - NEW YORK
STATE BOUNDARY
1050
1020
1020
1010
1010
1030
1000
990
990
980
980
LEGEND
970
STREAM BED
A
B
C
D
E
F
G
960
0
500
1000
1500
2000
2500
3000
3500
4000
4500
STREAM DISTANCE IN FEET ABOVE PENNSYLVANIA - NEW YORK STATE BOUNDARY
5000
5500
6000
6500
28P
(ALL JURISDICTIONS)
1000
TIOGA COUNTY, PA
NOTE: THE 10%, 2%, AND 1% ANNUAL
CHANCE FLOOD PROFILES IN THIS
AREA ARE COINCIDENT.
1030
1040
FLOOD PROFILES
1040
1050
1040
1030
1030
1020
1020
1010
1000
1000
990
990
LEGEND
980
STREAM BED
H
970
5500
I
6000
6500
7000
7500
8000
8500
9000
9500
10000
STREAM DISTANCE IN FEET ABOVE PENNSYLVANIA - NEW YORK STATE BOUNDARY
10500
11000
11500
12000
29P
(ALL JURISDICTIONS)
1010
TIOGA COUNTY, PA
NOTE: THE 10%, 2%, AND 1% ANNUAL
CHANCE FLOOD PROFILES IN THIS
AREA ARE COINCIDENT.
1040
1050
FLOOD PROFILES
1060
LIMIT OF STUDY
1060
1130
1120
1120
1110
1110
G
1100
1100
LEGEND
1090
STREAM BED
A
1080
55000
55500
56000
B
56500
C
57000
D
57500
58000
E
58500
F
59000
STREAM DISTANCE IN FEET ABOVE COWANESQUE DAM
59500
60000
60500
61000
*DATA NOT AVAILABLE
61500
1130
30P
(ALL JURISDICTIONS)
1140
TIOGA COUNTY, PA
1140
FLOOD PROFILES
1150
1150
1160
STATE ROUTE 49
1160
1170
1170
1180
SOUTH BUFFALO STREET
1180
1150
1140
1140
1130
1130
1120
1120
O
P
1110
1110
LEGEND
1100
STREAM BED
H
1090
61500
I
62000
J
62500
63000
K
63500
L
64000
M
64500
65000
N
65500
66000
66500
67000
67500
68000
1150
31P
(ALL JURISDICTIONS)
NOTE: THE 10%, 2%, AND 0.2% ANNUAL CHANCE FLOOD PROFILES
WERE NOT COMPUTED DOWNSTREAM OF THIS POINT
TIOGA COUNTY, PA
1160
FLOOD PROFILES
1160
1170
1170
1160
1160
1150
1150
1140
1140
T
1130
1130
LEGEND
1120
STREAM BED
Q
1110
68000
68500
R
69000
69500
S
70000
70500
71000
71500
72000
72500
73000
73500
74000
74500
1170
32P
(ALL JURISDICTIONS)
1170
FLOOD PROFILES
1180
TIOGA COUNTY, PA
1180
1190
1190
CONFLUENCE OF HOLDEN CREEK
1200
LOCEY CREEK ROAD
(HOLDEN STREET)
1200
1200
1190
1190
1180
1180
1170
1170
1160
1160
W
1150
1150
LEGEND
1140
STREAM BED
U
1130
74500
75000
75500
76000
V
76500
77000
77500
78000
78500
79000
79500
80000
80500
81000
1200
33P
(ALL JURISDICTIONS)
1210
TIOGA COUNTY, PA
1210
FLOOD PROFILES
1220
1220
1230
1190
1190
1180
1180
1170
1170
1160
1160
LEGEND
1150
STREAM BED
X
1140
81000
81500
82000
82500
83000
83500
84000
84500
85000
85500
86000
86500
87000
87500
1200
34P
(ALL JURISDICTIONS)
1200
FLOOD PROFILES
1210
TIOGA COUNTY, PA
1210
1220
1220
CONFLUENCE OF BULKLEY CREEK NO. 2
1230
1040
CROOKED CREEK
1050
FLOOD PROFILES
MANN HILL ROAD
(COWANESQUE STREET)
BEAR CREEK ROAD
(LR 58122)
CONFLUENCE WITH TIOGA RIVER
REACH 1
1040
1030
1020
1020
D
1010
1010
LEGEND
1000
STREAM BED
A
0
500
1000
1500
B
2000
2500
C
3000
3500
4000
4500
5000
5500
6000
6500
35P
(ALL JURISDICTIONS)
1030
TIOGA COUNTY, PA
THE 2% ANNUAL CHANCE FLOOD PROFILE
IS TOO CLOSE TO THE 1% ANNUAL CHANCE
PROFILE TO BE SHOWN SEPARATELY.
1050
1060
1050
1050
1040
1040
I
J
1030
1030
LEGEND
1020
STREAM BED
E
6500
F
7000
7500
G
8000
8500
9000
H
9500
10000
10500
11000
11500
12000
12500
13000
CROOKED CREEK
1060
36P
(ALL JURISDICTIONS)
1070
TIOGA COUNTY, PA
1070
FLOOD PROFILES
1080
DEWEYS LANE
(OLD STATE
ROUTE 287)
CONFLUENCE OF
ELKHORN CREEK
1090
STATE
ROUTE 287
1080
ABANDONED RAILROAD
MCALLISTER STREET
1090
1060
BASE OF
HAMMOND DAM
1050
1050
LEGEND
1040
STREAM BED
K
13000
L
13500
14000
M
14500
15000
15500
N
16000
O
16500
17000
17500
18000
18500
19000
19500
CROOKED CREEK
37P
(ALL JURISDICTIONS)
1060
TIOGA COUNTY, PA
1070
FLOOD PROFILES
LIMIT OF STUDY
1070
1350
1350
1340
1340
1330
1330
1320
1320
LEGEND
1310
STREAM BED
22500
23000
23500
24000
24500
25000
25500
26000
26500
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH STONY FORK
27000
27500
28000
28500
*DATA NOT AVAILABLE
29000
1360
38P
(ALL JURISDICTIONS)
1360
TIOGA COUNTY, PA
1370
FLOOD PROFILES
STONY FORK ROAD
(SR-3007)
STONY FORK CREEK ROAD
1380
1370
1380
1410
1400
1400
1390
1390
1380
1380
LEGEND
1370
STREAM BED
A
29000
29500
30000
30500
B
31000
C
31500
D
32000
32500
33000
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH STONY FORK
33500
34000
34500
35000
*DATA NOT AVAILABLE
35500
1410
39P
(ALL JURISDICTIONS)
1420
TIOGA COUNTY, PA
1420
FLOOD PROFILES
STONY FORK SCHOOL ROAD
(SR-3006)
NORTH LAWTON ROAD
(TR-385)
1430
1430
1090
1090
1080
1080
1070
1070
1050
1060
STATE ROUTE 287
1060
RAILROAD
CULVERT
LEGEND
STREAM BED
A
B
1040
0
200
400
600
800
1000
1200
1400
1600
STREAM DISTANCE IN FEET ABOVE CONFLUENCE WITH CROOKED CREEK
1800
2000
2200
2400
2600
ELKHORN CREEK
1100
40P
(ALL JURISDICTIONS)
1100
TIOGA COUNTY, PA
1110
FLOOD PROFILES
1110
1120
TOP OF ROAD
ELEVATION 1124.4
1120
1130
CONFLUENCE WITH CROOKED CREEK
1130
1120
1110
1110
D
1100
1100
LEGEND
1090
STREAM BED
C
1080
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
5200
ELKHORN CREEK
1120
41P
(ALL JURISDICTIONS)
1130
TIOGA COUNTY, PA
1130
FLOOD PROFILES
1140
1140
1160
1150
1150
F
1140
1140
LEGEND
1130
STREAM BED
E
1120
5200
5400
5600
5800
6000
6200
6400
6600
6800
7000
7200
7400
ELKHORN CREEK
1160
42P
(ALL JURISDICTIONS)
1170
TIOGA COUNTY, PA
1170
FLOOD PROFILES
1180
1180

tioga county, pa

Transcription

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