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Flood risk assessment of Barak river valley

Table 4. The significant weightage of the vulnerability indicators
Parameters Normalized AHP weightage (%) Sub‑classes Functional relation Rank
Population density 32.35 <200 Direct 1
200 – 400 2
400 – 600 3
600 – 800 4
>800 5
Household density 24.31 <50 Direct 1
50 – 100 2
100 – 150 3
150 – 200 4
>200 5
Population (0 – 6) 17.5 <100 Direct 1
100 – 200 2
200 – 300 3
300 – 400 4
>400 5
Illiteracy rate 12 <15 Direct 1
15 – 25 2
25 – 35 3
35 – 45 4
>45 5
Agricultural worker 8.12 <50 Direct 1
50 – 100 2
100 – 150 3
150 – 200 4
>200 5
Marginal worker 5.72 <40 Direct 1
40 – 80 2
80 – 120 3
120 – 160 4
>160 5
Abbreviation: AHP: Analytic hierarchy process.

4.5. Flood risk assessment Risk = Hazard × Vulnerability (IX)
Disaster risk has been defined as the probability of
disaster occurrence and its projected future damage Risk = Impact of hazard × Elements at risk ×
or how badly it can affect any society. Disaster risk Vulnerability of elements at risk (X)
assessment is an essential step to being prepared and
ready to act before a disaster strikes. The term flood Risk = Hazard × Vulnerability × Value (of the threatened
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risk on different occasions has been elaborated similarly, area)/preparedness (XI)
emphasizing various elements by different scientists,
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as shown in Equations IX to XIII. Risk = Probability × Consequences (XII)

Volume 22 Issue 2 (2025) 77 doi: 10.36922/AJWEP025040019