Detailed Landslide and Flood Hazard Map of Lianga, Surigao Del Sur

II NN DD EE XX MM AA PP :: 126°0'0"E 126°5'0"E

SAN AGUSTIN

DETAILED LANDSLIDE AND FLOOD HAZARD MAP OF 4118-II-10 4218-III-6 4218-III-7 8°40'0"N 8°40'0"N LIANGA, SURIGAO DEL SUR, PHILIPPINES

PROSPERIDAD (Capital) 4218-III-11 PAYASAN QUADRANGLE 4118-II-15 4218-III-11 4218-III-12 LIANGA

126°0'0"E 126°1'0"E 126°2'0"E 126°3'0"E 4118-II-20 4218-III-16 4218-III-17 8°35'0"N 8°35'0"N

4 2 SAN FRANCISCO 0

0 0 0 6 0 1 0 126°0'0"E 126°5'0"E 0 0 4 1 8°39'0"N

0 3 8°39'0"N 1 4 6 6 1 3 0 0 40 3 160 80 160 240

80 180

320 28 0 0 12 80 300 80 1 0 4 0 1 μ 0 0 0 0120.5 140 3

0 0 80 2 26 0 Kilometers 0 8 240 80

2 20 L E G E N D : 80 L E G E N D : POBLACION 80 160 Barangay center location 100 180 Main road P! 60 200 220 So. Magaling 120 Secondary road (Poblacion)# Purok/Sitio location (Barangay)

10 0 Track; trail n School

0 River v® Hospital 20 120

0 8 Municipal boundary G Church 80 80 60 80 80 Contour (meter) Proposed relocation site

Purok III Mongkabit Landslide 0 (San Pedro) 6 Purok II # (Magsaysay)# Purok II

(San Pedro) 8°38'0"N Purok I # 8°38'0"N (Magsaysay) San Pedro Elementary School P# (San Pedro) Very high landslide susceptibility nMAGSAYSAY n Purok I Magsaysay Elementary School (San Pedro) 8 # (Magsaysay) 0 nPSAN PEDRO Areas usually with steep to very steep slopes and underlain by 1 San Pedro Day Care Center 0 weak materials. Recent landslides, escarpments and tension 0 200 (San Pedro) 2 60 0 0 cracks are present. Human initiated effects could be an Purok IV aggravating factor. (San Pedro) 1 # 2 0

0 0 High landslide susceptibility 1

1 6 0 Areas usually with steep to very steep slopes and underlain by 2 0 0 weak materials. Areas with numerous old/inactive landslides. 2 2 0 2

4 0 0 6 Moderate landslide susceptibility 2

0 6 1 2 Areas with moderately steep slopes. Soil creep and other 8 0 0 2 4 00 2 indications of possible landslide occurrence are present. 6 100 6 0 0 Low landslide susceptibility

1 2 2 0 8 6 0 0 0 6 60 0 Gently sloping areas with no identified landslide.

0 2 1 Debris flow / Possible accumulation zone

0 6 Areas that could be affected by landslide debris. 60 180

2 4 0 Active landslide >>>D Creep 120

0 6 Inactive landslide Tension crack

6 0 Landslide area with mitigating measure HHHGully

6 0 1 4 0 /// 2 Rock fall/Rock slide prone area Riverbank erosion 1 6 40 0

Purok VII Purok V 220 (Magsaysay) 26 # (Magsaysay)# 0 Old landslide deposits 200 8°37'0"N 8°37'0"N Recent landslide deposits

6 2 Areas susceptible to ground subsidence/sinkhole development 2 4 0 0 2 8 6 6 0 2 1 0 0 0 4 8 0 0 8 0 2 3

280 22 Flood 0 80 280 2 60 Very high flood susceptibility Areas likely to experience flood heights of greater than 2 meters and/or flood duration of more than 3 days.

1 These areas are immediately flooded during heavy rains 8 0 of several hours; include landforms of topographic lows 0 2 2 such as active river channels, abandoned river channels and area along river banks; also prone to flashfloods. 1 2 2 0 0

0 1 6 0 High flood susceptibility Areas likely to experience flood heights of greater than 1 up to

2 0 24 0 0 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 300 such as active river channels, abandoned river channels 0 2 2 and area along river banks; also prone to flashfloods. 220 260 Moderate flood susceptibility 2 2 320 3 40 60 60 240 26 280 2 0 3 2 4 0 Areas likely to experience flood heights of greater than 0.5m up to 0 340 280 1 meter and/or flood duration of 1 to 3 days. These 1 8 3 3 0 6 60 0 areas are subject to widespread inundation during prolonged and 0 0 0 2 3 extensive heavy rainfall or extreme weather condition. Fluvial terraces, 3 2 00 340 0 2 360 24 0 260 0 alluvial fans, and infilled valleys are areas moderately subjected to flooding. 8°36'0"N 8°36'0"N 126°0'0"E 126°1'0"E 126°2'0"E 126°3'0"E 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 Data Sources : Coordinate System : low hills and gentle slopes. They also have sparse to MGB Geohazard Assessment Team moderate drainage density. DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES Spheroid : ...... Clark 1866 Lands Geological Survey Division Projection : ...... Transverse Mercator Geosciences Division MGB Regional Office XIII MINES AND GEOSCIENCES BUREAU Datum : ...... Luzon 1911 Direction of 1.2 National Mapping and Resource Information Authority ? Flood depth (meter) North Avenue, Diliman, Quezon City ? rising floodwater