EVENT BASED RAINFALL RUNOFF MODELING USING GEOMORPHOCLIMATIC CHARACTERISTICS

Abstract

Stream flow synthesis from ungauged basins has long been a subject of scientific investigation. Rodriguez and Valdes (1979) in their pioneering study introduced the concept of Geomorphological Instantaneous Unit .Hydrograph (GIUH). The estimation of Velocity `V' used in the expression for determination of peak discharge and time to peak is quite. difficult and makes this approach almost impracticable for the field hydrologists. Rodriguez-Iturbe et al, (1982a) rationalized that `V' must be a function of the effective rainfall intensity and duration and proceeded to eliminate. 'V1 from the results in. Geomorphoclimatic Instantaneous Unit Hydrograph (GcIUH) approach. That GcIUH only gives the peak discharge (qp) and time to peak (tp) and assumes the shape of IUH as triangular. The derivation of complete shape is quite combursome.