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Table 1

Flood risk factors calculation and classification

FactorDomain of effectDescriptive level (flood hazard)Proposed weight of effect (a)Rate (b)Weighted rating (a × b)Total weightPercentage (%)
Flow accumulation (pixels) 459929.2–693976 Very high 10 1.5 15 39 9.68 
 253097.1–459929.1 High  12   
 108858.9–253097.1 Moderate  7.5   
 24493–108858.9 Low    
 0–24493 Very low  1.5   
Slope (°) 0–3.94 Very high 10 20 52 12.90 
 3.94–10.16 High  16   
 10.16–17.8 Moderate  10   
 17.8–26.13 Low    
 26.13–52.9 Very low    
Land use Zones seaward Very high 10 30 78 19.35 
 Shrub-brush-rangeland High  24   
 Cropland and pasture Moderate  15   
 Other agricultural land Low    
 Mixed forest land Very low    
Rainfall intensity (Units MFI) 99.8–103.3 Very high 10 1.5 15 39 9.68 
 96.9–99.8 High  12   
 94.2–96.9 Moderate  7.5   
 91.1–94.2 Low    
 87.1–91.1 Very low  1.5   
Geology A2 Very high 10 30 78 19.35 
 P3 High  24   
 P2 Moderate  15   
 P1 Low    
 K1 Very low    
Elevation (m) 0–32.7 Very high 10 4.5 45 117 29.03 
 32.7–67.1 High  36   
 67.1–108.8 Moderate  22.5   
 108.8–157.7 Low    
 158.7–265.1 Very low  4.5   
SUM      403 100 
FactorDomain of effectDescriptive level (flood hazard)Proposed weight of effect (a)Rate (b)Weighted rating (a × b)Total weightPercentage (%)
Flow accumulation (pixels) 459929.2–693976 Very high 10 1.5 15 39 9.68 
 253097.1–459929.1 High  12   
 108858.9–253097.1 Moderate  7.5   
 24493–108858.9 Low    
 0–24493 Very low  1.5   
Slope (°) 0–3.94 Very high 10 20 52 12.90 
 3.94–10.16 High  16   
 10.16–17.8 Moderate  10   
 17.8–26.13 Low    
 26.13–52.9 Very low    
Land use Zones seaward Very high 10 30 78 19.35 
 Shrub-brush-rangeland High  24   
 Cropland and pasture Moderate  15   
 Other agricultural land Low    
 Mixed forest land Very low    
Rainfall intensity (Units MFI) 99.8–103.3 Very high 10 1.5 15 39 9.68 
 96.9–99.8 High  12   
 94.2–96.9 Moderate  7.5   
 91.1–94.2 Low    
 87.1–91.1 Very low  1.5   
Geology A2 Very high 10 30 78 19.35 
 P3 High  24   
 P2 Moderate  15   
 P1 Low    
 K1 Very low    
Elevation (m) 0–32.7 Very high 10 4.5 45 117 29.03 
 32.7–67.1 High  36   
 67.1–108.8 Moderate  22.5   
 108.8–157.7 Low    
 158.7–265.1 Very low  4.5   
SUM      403 100 
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