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Flood risk assessment of Barak river valley
Pr 3.70 5.05 0.98 5.26
(Max‑min) Min Rf 0.19 0.19 0.19 0.19
Max–min (Rf) 0.70 0.96 0.19 1
Max (Rf) 0.70 0.96 0.26 1
Min (Rf) 0.00 0 0.07 0
Rf (%) 4 0 25 70 96 4 0 0 0 26 21 26 20 7 100 0 0 0 0
Rf 0.04 0.00 0.25 0.70 0.96 0.04 0 0 0 0.26 0.21 0.26 0.20 0.07 1 0 0 0 0
Frequency ratio 0.80 0.00 4.66 12.91 18.38 1.93 0.08 0 0 0 2.01 1.53 1.24 1.51 1.15 0.43 5.85 3.03 0 0 0 0 3.03
% of the number of floods 38.84 0.00 57.02 4.13 98.35 1.65 0 0 0 8.26 23.97 31.40 20.66 15.70 100 0 0 0 0
Number of floods 47 0 69 5 119 2 0 0 0 10 29 38 25 19 121 0 0 0 0
Percentage (%) 48.59 38.86 12.23 0.32 50.95 20.51 11.15 6.26 11.12 5.42 19.36 20.82 17.99 36.41 33.04 15.42 15.80 13.93 21.82
Pixel count 16,390,344 13,106,647 4,126,165 107,931 17,186,661 6,918,887 3,760,359 2,113,104 3,752,077 1,827,179 6,529,764 7,023,579 6,069,805 12,280,761 11,146,025 5,200,503 5,330,397 4,699,604 7,359,918 Abbreviations: Pr: Final parameter weightage; Rf: Frequency ratio.
Table 1. (Continued) Class name/description Geology Neogene sedimentary rock Paleogene sedimentary rock Quaternary sediments Tertiary sedimentary rock Sum Distance from road <1000 1000 – 2000 2000 – 3000 3000 – 4000 >4000 Sum Distance from river <500 500 – 1000 1000 – 1500 1500 – 2000 >2000 Sum Elevation <250 250 – 500 500 – 750 750 – 1000 >1000 Sum
Volume 22 Issue 2 (2025) 71 doi: 10.36922/AJWEP025040019
