South Main Watershed Assessment

Citywide Stormwater Management/Flood Control Assessment
City of Rockford
South Main Watershed
South Main Watershed Assessment
Introduction
Material presented in the following summary documents current stormwater management and
flooding issues for the South Main Watershed. Information presented is based on a review of
available information related to current conditions in the drainage basin. No comprehensive
analysis of stormwater management and flooding issues in the watershed has been performed in
the last 20 years.
Watershed Description
Description and Land Use
The South Main watershed is located in the
northern part of the City of Rockford on the east
side of the Rock River. The watershed drains
approximately 1,200 acres at its mouth. 78% of
the watershed is located within the City of
Rockford. The watershed is compact and small,
with the receiving stream being the Rock River
to its east.
Watershed Statistics: South Main
Total Area:
Total Area within City:
1,200 ac.
936 ac.
% of City within Watershed:
2.4%
Other Stakeholders:
None
No. of Detention Facilities
0
The South Main watershed is about 60%
No. of Outfalls
4
developed. The South Main watershed contains
a few commercial and industrial parks on the west bank of the Rock River. There is light
residential development concentrated in the central and eastern portions of the watershed, but
parkland and vacant parcels dominate the western borders. There are also a handful of schools
and recreation facilities.
Topography and Soils
The topography of the South Main watershed is that of a relatively flat and compact watershed on
the west bank of the Rock River. Ground elevations within the watershed range from about 850
feet NAVD near Montague Road to about 700 feet NAVD near the watershed’s boundary with
the Rock River.
Soils within the South Main watershed consist primarily of type B soils, with a thin strip of type
D soils in the center of the watershed. Type B soils are soils with moderately low runoff
potential when thoroughly wet. Water can be transmitted through these soils without
SM-1
Citywide Stormwater Management/Flood Control Assessment
City of Rockford
South Main Watershed
impediment. Type B soils typically have less than 20 percent clay, and between 50 and 90
percent sand with a loamy sand or sandy loam textures. These soils have moderately fine to
moderately coarse textures. Type D soils are characterized by properties that restrict water
movement through the soil. Type D soils typically have greater than 40 percent clay, less than 50
percent sand, and have clayey textures. They have high runoff potential when thoroughly wet.20
The predominance of type B soils in the South Main watershed should facilitate infiltration of
rainfall in pervious areas, thereby contributing to lower runoff volumes and rates than in basins
with less pervious soil types.
Primary Receiving Stream
The Rock River is the receiving stream for the South Main watershed. The watershed is flat and
the gentle slope to the River is the direction of runoff flow.
Due to the lack of a receiving stream within the watershed itself, there are no impoundments or
gauging stations in South Main.
There is no readily available flow data for the South Main watershed as the watersheds
contribution to the Rock River can not be feasibly measured.
Given the character of the watershed, flooding within South Main is primarily caused by pooling
due to wet weather events. As shown in Figure SM-1, the floodplain along the Rock River is
very small, and along the South Main boundary, it does not enter any developed area.
Records maintained by the Federal Emergency Management Agency (FEMA), indicate that no
letters of map revision (LOMRs) have been issued for development projects in the South Main
watershed during the past 30 years.
Water Quality and NPDES Discharges
SCORE has not collected water quality data in the South Main watershed.
Table SM-1 provides the NPDES-permitted point sources identified within the watershed using
the USEPA’s water quality mapping program, BASINS.
Table SM-1
NPDES POINT SOURCES LOCATED WITHIN THE SOUTH MAIN WATERSHED
ROCKFORD, ILLINOIS
NPDES Permit # Facility Name
Receiving Water
20
Burke, Christopher and Thomas Burke. HERPICC Stormwater Drainage Manual. West Lafayette, Indiana: Purdue
Research Foundation, 1994.
SM-2
Citywide Stormwater Management/Flood Control Assessment
City of Rockford
IL0059226
South Main Watershed
Laredo Liquor
Rock River
Runoff from industrial sites is a potential pollutant source for receiving waters. Table SM-2 lists
the industrial sites within the South Main watershed.
Table SM-2
INDUSTRIAL SITES LOCATED WITHIN THE SOUTH MAIN WATERSHED
ROCKFORD, ILLINOIS
Name
Street
St. Ambrogio Society
Montague
Land Use
Code (LUC)
7992
Nature Science Middle Ogilby Rd.
School
Jumpin Jack'
s Playland
Marchesano Dr.
8210
5000
LUC Description
Clubs
&
Services
Organizations w/Food
Educational Facilities – w/o
Sp, FC.
Wholesalers & Retail Outlets
Existing Drainage Network
Drainage within the South Main watershed occurs through a mix of surface drainage and gravity
storm sewers. The western part of the watershed, surface drainage is the primary mode of
stormwater conveyance. The northeastern part of the South Main watershed is drained by
networks of storm sewers as shown in Figure SM-2.
Figure SM-2 also shows the general location of identified detention basins and storm sewer
outfalls within the South Main watershed. The South Main watershed has no identified detention
facilities which is expected due to the age of the infrastructure in this watershed. The 4 identified
storm sewer outfalls within the watershed are concentrated along the bank of the Rock River.
Available Data Resources
Previous Drainage Studies
A review of available data identified no recent, comprehensive studies of drainage issues within
the South Main watershed.
Historic Flow Data
No source of historic flow data has been identified for the South Main watershed.
SM-3
Citywide Stormwater Management/Flood Control Assessment
City of Rockford
South Main Watershed
Historic Water Quality Data
No source of historic water quality data has been identified for the South Main watershed.
(pending input from David Pott)
Other
Flood Insurance Study:
Winnebago County and Incorporated Areas, (FEMA, 2006)
Soil Characteristics:
“Soil Survey Geographic (SSURGO) database for Winnebago County, Illinois.”
Fort Worth: U.S. Department of Agriculture, Natural Resources Conservation Service, 2007.
URL:<http://SoilDataMart.nrcs.usda.gov/>
Drainage Issues
Table SM-3 provides a summary listing of current identified drainage issues and projects within
the South Main watershed. The general locations of these issues and projects are shown on
Figure SM-1.
There is very little flooding and stormwater management issues in this watershed. If the City
receives ponding complaints from the from residents, they respond to the best of their ability.
Further evaluation of site-specific stormwater management/flood control improvement needs is
required to provide a basis for effective planning, budgeting, and prioritization of potential
projects.
Table SM-3
SUMMARY OF STORMWATER/FLOOD CONTROL ISSUES AND PROJECTS
SOUTH MAIN WATERSHED, ROCKFORD, ILLINOIS
1
2
Brief Description of Issue
Springfield Avenue and Beltline Road - future development.
SM-4
Proposed Project
Future Project
Maintenance Required
Improvements Completed
Action
Water Quality Impacts
Localized/Nuisance Flooding
#
Major Surface Flooding
Over-bank Flooding
Issue Type
3RD
10TH
7TH
HARRISON
OLSEN
Watershed Boundary
ALTON
PARK
FloodWay
Complaints
REED
City
FITCH
BARNUM
8TH
Limits
7TH
LYLE
RIVER
BLAIR
QUIN
CHAP
MAN
Proposed Project
BROOKE
ROCKFORD
BILDAHL
Type
WILLS
9TH
SCORE
Issue
RANGER
4TH
ECHO
100-yr Floodplain
COLLINS
EXPRESS
8TH
South East
23RD
Legend
MAIN
CENTRAL
SENECA
IROQUOIS
21ST
QUAKER
ENERGY
BROOK
21ST
22ND
R
ADELINE
6TH
5TH
21ST
NE
SA
MARION
BROADWAY
BLACKHAWK PARK
HARRISON
ON
ALG
EXPORT
13TH
6TH
E
IROQUOIS
SAUK
10TH
5TH
16TH
5TH
C
TI
0
Y2
HW
Feet
12TH
LORDEN
8TH
MAGNOLIA
KEEFE
15TH
11TH
4TH
BARNES
LEWIS
SAND
KISHWAUKEE
GREGORY
9TH
MATTIS
SEMINOLE
7TH
AD
18TH
MAGNOLIA
SEMINARY
EN
US
2,000
CORNELIA
RA
ILR
O
7TH
17TH
VIOLET
FULMER
8TH
6TH
Keith Creek
SOUTH
Khlem
HALL
4TH
5TH
UNION
PEOPL ES
Blackhawk
PRAIRIE
MUTIMER
4T
H
2N
D
3R
D
3RD
BUCHANA
N
RIVER
AR
Y
EE
T
STR
NA
ME
D
UN
MARY
LINDA
Fuller Creek
3RD
20TH
CLARA
LUCILLE
PR
TH
E
BUCKBEE
BROADWAY
CHRISTINA
HOLLAND
ROSE
CLOVER
RE
ST
OR
RAMP
0
Y2
HW
JEAN
W
MA ATE
R
DI
SO
N
1S
T
MA
IN
ORANGE
SANO
IUM
US
3
BANKS
N
SO
EL
BLACKHAWK
IRIS
PRENTICE
VE
D
8TH
ISLAND
S
2ND
BAKER
AM
N
CHA
RLE
1ST
CATLIN
SE
MIN
WEST
2
GRAH
INDIANA
MARC
HE
BREMER
REVELL
Sinnissippi
STATE
COLLEGE
LANE
ILLINOIS
RA
MP
FISK
ROCK
SALTE
R
POND
EDNA
1
COLE
OGILBY
KELLEY
CHURCH
HULIN
WISCONSIN
South Main
WY
MA
N
EB
AG
O
WI
NN
FERGUSO
N
SANFORD
CORBIN
ROSE
HOLLAND DIC
ROSE
LOOMIS
SPAFFORD
ET
OA
K
GR
O
FO
R
KNOWLTON
LINCOLN
FERN WIGTON
ASH
UT
MA
RK
MORGAN
CLIFTON
MICHIGAN
WA
LN
KENT
IVY
DOMINO
North Main
KENT
KNOWLTON
HARDING
HOPKINS
A
ROMONA
KERMAN
CENTRAL
CLOVER
N
A
O
IN
AG
CLOVER
VICTORIA
EG
M
O
VE NTA
NI
G
UE
CE
T
R
AR
CE
DA
R
BLAKE
COURT
BIANCA
HORACE
E
SUNS
Kent Creek
HULIN
HULIN
SOUTH
HOUGH
TON
CUNNINGH
AM
BLAKE
GENOA
VICTORIA
N
TA
Y
JOHNSTON JOHNSTON
FOSTER
CU
M
PIERPONT
LEXINGTON
HARTFORD
CONCORD
CAMBRIDGE
TRENTON
NEWPORT
DAISYFIELD
Ü
CROWLEY
A
GH
NIN
HUDSON
BARNUM
South Main Watershed Flooding Issues
Figure SM - 1
City of Rockford, Illinois
Autumn 2008
4T
H
3RD
4TH
6TH
5TH
UNION
RA
ILR
O
7TH
3RD
11TH
12TH
5TH
LORDEN
8TH
16TH
23RD
Legend
5TH
OLSEN
Pipe
RANGER
REED
SubType
FITCH
BARNUM
8TH
GravityMain
7TH
LYLE
RIVER
BLAIR
CHAP
MAN
SENECA
IROQUOIS
BROOKE
BILDAHL
Watershed Boundary
WILLS
4TH
ECHO
MAIN
CENTRAL
ADELINE
Outfall
R
MARION
ALTON
PARK
NE
SA
SCORE
HARRISON
Detention
9TH
EXPRESS
"
)
!
(
Culvert
BROOK
21ST
QUAKER
MATTIS
SEMINOLE
21ST
22ND
ENERGY
QUIN
EXPORT
8TH
21ST
HARRISON
ON
ALG
IROQUOIS
SAUK
7TH
5TH
BLACKHAWK PARK
6TH
SEMINARY
E
0
Y2
HW
Feet
6TH
18TH
COLLINS
LUCILLE
C
TI
US
2,000
BROADWAY
17TH
VIOLET
CORNELIA
13TH
4TH
KEEFE
15TH
KISHWAUKEE
GREGORY
BARNES
SE
MIN
10TH
LEWIS
SAND
SOUTH
FULMER
7TH
AD
9TH
PEOPL ES
PRAIRIE
8TH
3RD
10TH
BUCHANA
N
AR
Y
CHRISTINA
STR
MARY
LINDA
MUTIMER
HALL
2N
D
3R
D
W
MA ATE
R
DI
SO
N
1S
T
WY
MA
N
MA
IN
RIVER
ROCK
EE
T
TH
E
CLARA
EN
JEAN
PR
BANKS
VE
D
20TH
NA
ME
D
RAMP
0
Y2
HW
RE
ST
OR
IRIS
UN
IUM
!
(
US
FISK
ORANGE
!
(
BROADWAY
BLACKHAWK
RA
MP
EDNA
CHURCH
SANO
BUCKBEE
MAGNOLIA
CLIFTON
HOLLAND
ROSE
CLOVER
N
N
SO
EL
S
2ND
CATLIN
!
(
INDIANA
MARC
HE
CHA
RLE
1ST
BAKER
!
(
MAGNOLIA
WEST
ISLAND
ILLINOIS
PRENTICE
LANE
GRAHA
M
POND
KELLEY
BREMER
REVELL
STATE
8TH
SALTE
R
COLE
OGILBY
EB
AG
O
WI
NN
FERGUSO
N
SANFORD
HULIN
WISCONSIN
South Main
UT
COLLEGE
KNOWLTON
LINCOLN
ROSE
LOOMIS
SPAFFORD
ET
MORGAN
CORBIN
ROSE
HOLLAND DIC
KENT
FERN WIGTON
ASH
MA
RK
OA
K
FO
R
COURT
BIANCA
MICHIGAN
WA
LN
GR
O
KENT
IVY
DOMINO
CE
DA
R
BLAKE
KNOWLTON
HARDING
HOPKINS
A
ROMONA
KERMAN
CENTRAL
CLOVER
N
A
O
IN
AG
CLOVER
VICTORIA
T
EG
AR
VICTORIA
PIERPONT
HORACE
E
SUNS
HULIN
HULIN
SOUTH
HOUGH
TON
CUNNINGH
AM
BLAKE
GENOA
R
JOHNSTON JOHNSTON
FOSTER
N
M
TA
Y
M
O
VE NTA
NI
G
UE
CE
CU
A
GH
NIN
LEXINGTON
HARTFORD
CONCORD
CAMBRIDGE
TRENTON
NEWPORT
DAISYFIELD
Ü
CROWLEY
HUDSON
BARNUM
OpenChannel
South Main Outfalls, Detention and Storm Sewer
Figure SM - 2
City of Rockford, Illinois
Current Data as of Autumn 2008