Simulation of Rainfall-Runoff Process and Estimate of Flood with HEC-HMSModel in Khorramabad Catchment Area

Document Type : Research Paper

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Abstract

The rainfall-runoff process of a catchment area is mainly influenced by hydrological, Geomorphological  and climatic conditions of the region. ne of the most popular methods for understanding the rainfall runoff process is its simulation by  using the hydrological model and analyzing the results. In this study, by  using HEC– HMS model,  the rainfall – runoff of Khorramabad catchment area  was simulated and analyzed. The results showed a good correlation between the observed and simulated Hyetographs  at the basin outlet. The values of performance indicators which simulated  at the validation  stage by Nash–Sutcliffe coefficient and coefficient of variance were  0.68 and 0.09 respectively,  which indicate the  high-performance of  model in estimating  maximum flow in the studied catchment area.  Then by using the optimized parameters, the rainfall Hyetograph at different return periods were entered in the model and the flood Hyetograph was obtained at different return periods.
The  use of model  in the return periods of 2, 5, 10, 50, 100 years respectively has caused  the flood peak discharge rate of 762, 1020, 1442, 1955, 2248 cubic meters per second . Results show that runoff can be predicted with high accuracy by  using this model.

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  • Receive Date: 09 January 2016
  • Accept Date: 09 January 2016

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