detailed landslide and flood hazard map of butuan city - MGB-R13
Transcription
detailed landslide and flood hazard map of butuan city - MGB-R13
I N D E X 4118-IV-9 BUTUAN CITY (Capital) 4118-IV-13 4118-IV-14 SIBAGAT 125°39'0"E 8°54'0"N 125°35'0"E 0 0.5 4118-IV-19 4118-IV-18 4118-IV-17 μ 8°50'0"N 8°55'0"N 4118-IV-8 8°50'0"N 125°38'0"E 4118-IV-7 4118-IV-12 8°54'0"N 125°37'0"E 125°40'0"E 8°55'0"N 125°35'0"E DETAILED LANDSLIDE AND FLOOD HAZARD MAP OF BUTUAN CITY (CAPITAL), AGUSAN DEL NORTE, PHILIPPINES 4118-IV-13 MAIBU QUADRANGLE 125°36'0"E M A P : 125°40'0"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 # Purok V (Salvacion) Purok IV (Afga) # 8°53'0"N 8°53'0"N Purok XIII (Afga) 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. Purok VI (Salvacion) # Proposed relocation site Contour (meter) 80 Barangay center location Purok X (Afga) # High landslide susceptibility Areas usually with steep to very steep slopes and underlain by weak materials. Areas with numerous old/inactive landslides. Purok XIVA (Afga) # Moderate landslide susceptibility Areas with moderately steep slopes. Soil creep and other indications of possible landslide occurrence are present. Low landslide susceptibility Gently sloping areas with no identified landslide. San Isidro Elementary School Purok XIVB (Afga) (Afga) n # Debris flow / Possible accumulation zone Areas that could be affected by landslide debris. Active landslide > > D > Creep Inactive landslide Tension crack Landslide area with mitigating measure 8°52'0"N Purok XII (Afga) 8°52'0"N # / / / H H H Gully Riverbank erosion Rock fall/Rock slide prone area Old landslide deposits Recent landslide deposits Areas susceptible to ground subsidence/sinkhole development Flood Very high flood susceptibility 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. 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. Moderate flood susceptibility 125°36'0"E 125°37'0"E DEPARTMENT OF ENVIRONMENT AND NATURAL RESOURCES MINES AND GEOSCIENCES BUREAU North Avenue, Diliman, Quezon City ALL RIGHTS RESERVED PUBLISHED DECEMBER 2015 125°38'0"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. 125°39'0"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°51'0"N 8°51'0"N 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. % Flashflood exit point
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