A comparison of some methods of deriving the instantaneous unit hydrograph.

Abstract

The geomorphological instantaneous unit hydrograph (IUH) proposed by Gupta et al. (1980) was compared with the IUH derived by commonly used time-area and Nash methods. This comparison was performed by analyzing the effective rainfall-direct runoff relationship for four large basins in central Italy ranging in area from 934 to 4147 km2. The Nash method was found to be the most accurate of the three methods. -from Authors