ERDS, DENR-CAR - APAFRI-Asia Pacific Association of Forestry ...

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*For assessing landslide vulnerability due to physical factors,the resulting thematic maps (slope, soil, geology/seismic, landuse, and climate) were assigned with corresponding hazardrating.*Then, relative weights were assigned and overlaid based on thefollowing relationship to compute for vulnerability:Landslide Vulnerability = [(Rated Slope Map * 0.25) + (RatedSoil Type/Morphology Map * 0.10) + (Rated Rainfall Map *0.15)+(Rated typhoon frequency Map * 0.15) + (RatedGeologic Formation/Geologic Age * 0.10) + (Rated RockFracturing/Fault line * 0.10) + (Rated Land Use/Cover Map* 0.15)]Landslide = [(0.90)(Biophysical Factors) +(0.10)(Anthropogenic Factors)]
Summary <strong>of</strong> Factors Affecting Vulnerability to Landslide(BUED RIVER WATERSHED)ITEM Weights Rating COMPUTED DESCRIPTIVERATING VULNERABILITYA. BIOPHYSICAL FACTOR 0.90 3.22* Slope and terrain 0.25 4.00 1.00 High* Soil 0.10 4.50 0.45 Very High* Rainfall 0.15 3.00 0.45 Moderate* Typhoon Frequency 0.15 4.00 0.60 High* Geologic Age 0.10 3.82 0.38 High* Land cover 0.15 2.65 0.40 Low* Rock fracturing/fault line 0.10 2.96 0.30 ModerateB. ANTHROPOGENIC FACTORS 0.10 0.39* Farming System 0.35 3.90 1.37 High* Ground Disturbance by human activities 0.35 4.40 1.54 Very High* Occupancy and habitations 0.30 3.20 0.96 ModerateOverall Computed Average Rating 3.60 High
Page 2 and 3: Rationale• Watersheds are primary
Page 4 and 5: RationaleThe historic and scenic Ke
Page 6 and 7: RationaleDuring heavy rainfall/adve
Page 10 and 11: 4. To formulate mitigating measures
Page 12 and 13: STARTAssessment of WatershedCharact
Page 14 and 15: B. Data GatheringPrimary Data• Wa
Page 16 and 17: D. Identification of Critical Facto
Page 18 and 19: A. Description of Bued River Waters
Page 20 and 21: Watershed Geo-morphological Feature
Page 22 and 23: GIS-Approach Landslide Analysis*Ove
Page 26 and 27: Summary of Factors Affecting Vulner
Page 28 and 29: Thematic Maps asModel Inputs
Page 36 and 37: HAZARD MAPS
Page 44 and 45: ‣ The vulnerability assessment of
Page 46 and 47: The following results were obtained
Page 48 and 49: 3) The result could be a useful bas
Page 50 and 51: BASED ON THE RESULTS OF THE STUDIES
Page 52 and 53: 3. Result of Vulnerability Assessme
Page 54 and 55: 5. There is a need of continuousmon
Page 56 and 57: 7. LGUs and other government agenci
Page 58 and 59: 9. Intensive IEC campaign must be d
Page 60 and 61: a. Installation of simple rainfall
Page 62 and 63: c. Planting of perennial crops or t
Page 64 and 65: e. Roadside/banks should be cleared
Page 66: RECOMMENDATIONS12. Monitoring of th
Page 71 and 72: Class Rating of Various ThemesCLASS

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