Flood Frequency Distribution Derived on the Based on Geomorphoclimatic Instantaneous Unit Hydrograph and Probability Density Function of Rainfall Excess Intensity and Duration (Case study: Menderjan Catchment)

Abstract

Derived flood frequency distribution method with geomorphoclimatic instantaneous unit hydrograph,
the joint probability density function (pdf) of storm intensity & duration, Philip's equation of the
!infiltration process were employed to derive a flood frequency distribution in Menderjan catchment
(one of the subbasins of Zayanderud watershed). This method provides an alternative to estimate flood
frequency distribution in ungauged catchments. This frequency distribution was compared with
frequency distribution resulted from statistical method (LP3 distribution). The results in this study
indicated that using climatic climax soil parameters was in a better agreement with the observations
than the ordinary conditions of soil parameters. This method was of poor performance in estimating
high return period floods.

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