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Among the environmental hazards ,flood in North Bengal plain express a unique variation from the foothill to southern most floodplains. It is typified by the anthropgenetic impact as bridge constructions. The flood hazard rate along the channel disclose that the probability exist both in upstream and downstream of the bridges ,even far downstream near the confluences of river Lish, Gish and Chel. It is furthermost justified by the flood susceptibility map and validated by AUC curve. The parameters as depth(m),velocity(m/sec) and debris factor are considered for flood rate computation and for susceptibility weightage to the parameters have been assigned using FUZZY-AHP. Both the result justify that in river Chel downstream section is more affected than upstream part comparing river Lish and Gish. River Gish experiences both in up and downward section. However, near bridges flood rate increase and then alteration is found. Mostly agricultural lands in lower flood plains, tea gardens in alluvial fan area and settlements are under the flood coverage area. It disclose the probable factors like distance from the foothill to bridge, grain size (D50), volume of discharge (cumec− 1) etc.

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