ABSTRACT
Estimation of design flood is one of the important components of planning, design and operation of water resources projects. Information on flood magnitudes and their frequencies is needed for design of hydraulic structures such as dams, spillways, road and railway bridges, culverts, urban drainage systems, flood plain zoning, economic evaluation of flood protection projects. According to Pilgrim et al [35], the estimation of peak flows on small and medium sized plains is generally the common application as they are required for the design of conservation works, etc. Although many different methods are available for estimating floods, the three widely used ones are rational method, US Soil Conservation Service Curve Number method and regional flood frequency methods.
