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Flood is a component of nature that continuously persists. The natural disaster happens not solely in the state of Assam, but all parts of world. It's the foremost pricey natural hazard owing to its ability to destroy human lives and properties. Therefore, a safety measure must be taken to avoid wasting gratuitous price and economic loss for preventing recurring inundation by flood water. This could be done by construction of barrages, dams, water reservoirs and widening or deeping the watercourse. These need high money price to prevent potential in destruction of the ecosystems of the watercourse itself. Therefore, flood protection projects without correct designing and planning can be counterproductive. So, to scale back the drawbacks, data associated with these aspects ought to be rigorously thought of. Transparent information associated with magnitudes and frequencies of the occurrences of flood is required to counter the menace. Data relating to correct estimation of flood magnitudes and frequencies incidence are of absolute importance in designing, planning forecasting and management of every structure at the placement or station of interest. The planning ought to be done by considering the utmost flows that exceeds bound level during a given return period. On the other hand, the flows below the crucial price are less significant since their effect is negative.