Abstract
With the recent and drastic decline of hydrological in situ networks, flood estimation from ungauged basins is an imperative research area in scientific hydrology. In this regard, geomorphologic instantaneous unit hydrograph (GIUH) based on models by Clark in 1945 and Nash in 1957 are developed and applied to the Ajay River Basin at Jamtara in northern India. The geomorphologic parameters of the basin were estimated using ERDAS Imagine 8.5 image processing and geographic information system (GIS) software. The direct surface runoff (DSRO) hydrographs derived by the GIUH-based models without using historical runoff data, the conventional Clark IUH model option of the HEC-1 package, and the Nash IUH model, were compared with observed DSRO hydrographs employing four performance criteria. The DSRO hydrographs are computed with reasonable accuracy by the GIUH-based Clark and Nash models, when compared to the Clark IUH model option of the HEC-1 package and the Nash IUH model. It is observed that the GIS supporte...
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