detailed landslide and flood hazard map of san miguel - MGB-R13

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detailed landslide and flood hazard map of san miguel - MGB-R13
I N D E X
125°55'0"E
DETAILED LANDSLIDE AND FLOOD HAZARD MAP OF
SAN MIGUEL, SURIGAO DEL SUR, PHILIPPINES
4118-I-5 CALATNGAN QUADRANGLE
125°58'0"E
126°0'0"E
TANDAG (Capital)
4119-II-25
4219-III-21
4118-I-4
4118-I-5
4218-IV-1
4118-I-10
4218-IV-6
9°0'0"N
9°0'0"N
4119-II-24
SAN MIGUEL
125°59'0"E
126°0'0"E
9°0'0"N
Victoria Prop. Relocation Site
(Victoria)
4118-I-9
9°0'0"N
125°57'0"E
M A P :
125°55'0"E
0
0.5
μ
126°0'0"E
1
2
Kilometers
L E G E N D :
POBLACION
Main road
!
P
So. Magaling
(Poblacion)
#
Purok/Sitio location (Barangay)
Track; trail
n
School
River
®
v
Hospital
Municipal boundary
G
Church
Secondary road
8°59'0"N
8°59'0"N
Proposed relocation site
Contour (meter)
80
Barangay center location
Landslide
Very high landslide susceptibility
Areas usually with steep to very steep slopes and underlain by
weak materials. Recent landslides, escarpments and tension
cracks are present. Human initiated effects could be an
aggravating factor.
High landslide susceptibility
Areas usually with steep to very steep slopes and underlain by
weak materials. Areas with numerous old/inactive landslides.
Moderate landslide susceptibility
Areas with moderately steep slopes. Soil creep and other
indications of possible landslide occurrence are present.
Low landslide susceptibility
Purok IV
(Carromata)
Purok VI Kiskis
(Siagao)
#
Purok III
(Carromata)
#
Gently sloping areas with no identified landslide.
#
Debris flow / Possible accumulation zone
Purok#II
(Carromata)
Purok I
#(Carromata)
#
Carromata Elementary School P CARROMATA
(Carromata)
Areas that could be affected by landslide debris.
n
Active landslide
>
>
D
>
Creep
Inactive landslide
Tension crack
Landslide area with mitigating measure
Purok I
(Sagbayan)
8°58'0"N
8°58'0"N
#
SAGBAYAN
Purok II P
(Sagbayan)
n
#
/
/
/
H
H
H
Gully
Riverbank erosion
Rock fall/Rock slide prone area
Old landslide deposits
Recent landslide deposits
Purok VII Lamintaw
(Siagao)
#
Areas susceptible to ground subsidence/sinkhole development
Purok V
(Carromata)
#
Flood
Purok V
(Siagao)
#
Very high flood susceptibility
Purok IX
(Siagao)
Areas likely to experience flood heights of greater than
2 meters and/or flood duration of more than 3 days.
These areas are immediately flooded during heavy rains
of several hours; include landforms of topographic lows
such as active river channels, abandoned river channels
and area along river banks; also prone to flashfloods.
#
Purok III
(Sagbayan)
#
Purok IV
(Sagbayan)
#
High flood susceptibility
Areas likely to experience flood heights of greater than 1 up to
2 meters and/or flood duration of more than 3 days.
These areas are immediately flooded during heavy rains
of several hours; include landforms of topographic lows
such as active river channels, abandoned river channels
and area along river banks; also prone to flashfloods.
Purok V
(Sagbayan)
#
Moderate flood susceptibility
Purok VI
(Sagbayan)
Areas likely to experience flood heights of greater than 0.5m up to
1 meter and/or flood duration of 1 to 3 days. These
areas are subject to widespread inundation during prolonged and
extensive heavy rainfall or extreme weather condition. Fluvial terraces,
alluvial fans, and infilled valleys are areas moderately
subjected to flooding.
125°57'0"E
125°58'0"E
DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES
MINES AND GEOSCIENCES BUREAU
North Avenue, Diliman, Quezon City
ALL RIGHTS RESERVED
PUBLISHED DECEMBER 2015
125°59'0"E
Data Sources :
MGB Geohazard Assessment Team
Lands Geological Survey Division
Geosciences Division MGB Regional Office XIII
National Mapping and Resource Information Authority
GIS Processing :
Lands Geological Survey Division
Low flood susceptibility
Areas likely to experience flood heights of 0.5 meter or less
and/or flood duration of less than 1 day. These areas include
low hills and gentle slopes. They also have sparse to
moderate drainage density.
126°0'0"E
Coordinate System :
Spheroid : . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Clark 1866
Projection : . . . . . . . . . . . . . . . . . . . . . . . . . . Transverse Mercator
Datum
: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Luzon 1911
Mapping scale 1:10,000
?
Direction of
rising floodwater
?
Direction of
receding floodwater
1.2
Flood depth (meter)
?
!
8°57'0"N
8°57'0"N
#
%
Flashflood exit point