Detailed Landslide and Flood Hazard Map of Libjo, Dinagat Islands

II NN DD EE XX MM AA PP :: 125°30'0"E 125°35'0"E

DETAILED LANDSLIDE AND FLOOD HAZARD MAP OF 4021-II-5 4121-III-1 4121-III-2 LIBJO, DINAGAT ISLANDS, PHILIPPINES

4021-II-10 4121-III-6 4121-III-7 4121-III-6 MAGSAYSAY QUADRANGLE LIBJO (ALBOR) 10°10'0"N 10°10'0"N

125°30'0"E 125°31'0"E 125°32'0"E 125°33'0"E 4021-II-15 4121-III-11 4121-III-12CAGDIA

Purok IV (San Antonio)# BASILISA (RIZA 1 125°30'0"E 125°35'0"E 40 Purok III 120 (San Antonio) 10°12'0"N 100 # 10°12'0"N 4 80 0 SAN ANTONIO (POB) 60 P#

0 Purok II 0 (San Antonio) Purok I Purok I SURIGAO STRAIT (San Antonio) (Albor)# # Purok II 20 8 (Albor) 0 # Albor Central Elementary School Purok III ALBOR (POB) (Boundary of Albor and San Antonio) 12 (Albor) P n 0

6 #

4 0 Albor Day Care Centern μ (Albor) Albor National High School Purok V (Albor) 120 0120.5 n 0 2 2 (Albor) 1 0 1

4 # 6 0 Purok VI 0 Kilometers (Albor)# # 0 Purok IV Purok VII (Albor) (Albor)# 0 0 14

0 0 1 LL E G E N D : 20 140 POBLACION 1 2 1 0 0 Main road Barangay center location 0 P!

So. Magaling

4 (Poblacion) 0 Secondary road # Purok/Sitio location (Barangay)

Track; trail n School Purok III Mabungahon (Osmeña) # Purok# I Malipayon 0 v® (Osmeña) 2 River Hospital #n # 1 P Purok I Masidlakon SURIGAO STRAIT Purok IV Mauswagon n$ # (Santo Niño) (Osmeña) OSMEÑA 0 Municipal boundary G Church

0 4 Proposed relocation site 1 80 Contour (meter) Purok II Malipayon 4 Purok III Makugihon 0 10 0 0 4 (Santo Niño) (Santo Niño) 1 # # 6 0 nSANTO NIÑOP Santo Niño Proposed Evacuation Center II (Santo Niño) Santo Niño Osmeña Elementary School $

(Santo Niño) 0 Landslide 0 10°11'0"N

8 20 10°11'0"N 0 0 Very high landslide susceptibility 6 Purok V Canijog 6 0 (Santo# Niño) Areas usually with steep to very steep slopes and underlain by Canijog Daycare Center weak materials. Recent landslides, escarpments and tension (Santon Niño) Purok IV Talisay cracks are present. Human initiated effects could be an (Santo# Niño) aggravating factor. High landslide susceptibility 0

0 4 40 Areas usually with steep to very steep slopes and underlain by 0

0 1 6 60 weak materials. Areas with numerous old/inactive landslides.

0 0

4 Moderate landslide susceptibility

8 0 0 0 18 6 0 Areas with moderately steep slopes. Soil creep and other 0 8 0

0 indications of possible landslide occurrence are present. 0 8 1

0 180

0 4 Low landslide susceptibility 0

220 Purok II- Patag Gently sloping areas with no identified landslide. 4 (Garcia) 0 #

2 0 2 0 0 Debris flow / Possible accumulation zone 1 1 0 6 0 Areas that could be affected by landslide debris.

4 0 Purok III-Sito Patag 0 8 (Garcia)# >>>D Purok V Rose 60 Active landslide Creep (Magsaysay)# Inactive landslide Tension crack

4 0 2 0 4 0 0 1 2

4 HHH 0 60 Landslide area with mitigating measure Gully 14 Magsaysay Proposed Relocation Site 0 2 (Magsaysay) 0 ///Rock fall/Rock slide prone area Riverbank erosion

80 Purok I 0 (Doña Helen) Purok II 2 Old landslide deposits Purok III # P

(Doña Helen) 10°10'0"N (Doña Helen) n #

10°10'0"N # Cahayag Elementary School 0 0

6 Recent landslide deposits 6 (Doña Helen)n 1 1 0 0 Doña Helen Daycare Center 40 (Doña Helen) 100 Areas susceptible to ground subsidence/sinkhole development 00 1 1 20 1 00 0

1 0 Flood 0 0 0 0 Purok IV Cabalawan 1 8 6 0 20 (Garcia)n 0 0

8 6 # 0 8 1 Very high flood susceptibility

1 2 Areas likely to experience flood heights of greater than 0 1 4 1 6 0 0 0 1 8 2 meters and/or flood duration of more than 3 days. 0 1 0 These areas are immediately flooded during heavy rains

6 1 of several hours; include landforms of topographic lows 4 0 such as active river channels, abandoned river channels

4 0 and area along river banks; also prone to flashfloods.

2 0 High flood susceptibility 160

1 4 0 Areas likely to experience flood heights of greater than 1 up to

0 2 1 20 2 meters and/or flood duration of more than 3 days.

0 4 1 These areas are immediately flooded during heavy rains

0 of several hours; include landforms of topographic lows 2 2 0 such as active river channels, abandoned river channels 0 2 8 60 and area along river banks; also prone to flashfloods.

0 8 2 12 Moderate flood susceptibility 0 1 0 0 140 1 Areas likely to experience flood heights of greater than 0.5m up to

6 2 0 8 10 0 0 1 meter and/or flood duration of 1 to 3 days. These 120 areas are subject to widespread inundation during prolonged and

1 0 1 2 2 4 extensive heavy rainfall or extreme weather condition. Fluvial terraces, 16 0 0 2 0 1 0 1 4 8 0 4 0 1 0 1 0 0 2 alluvial fans, and infilled valleys are areas moderately 80 6 1 subjected to flooding. 10°9'0"N 10°9'0"N 125°30'0"E 125°31'0"E 125°32'0"E 125°33'0"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