This paper aiIDS to derive and analysis for rational hydrograph and design flood discharge by relating of the rainfall-runoff model and flooding routing at small watershed in urban region. HEC-HMS (Hydrologic Modeling System) was applied to study area...
This paper aiIDS to derive and analysis for rational hydrograph and design flood discharge by relating of the rainfall-runoff model and flooding routing at small watershed in urban region. HEC-HMS (Hydrologic Modeling System) was applied to study area as a derived devices of the optimum design discharge from precipitation-runoff model through small urban catchment of the SIWHA reservoir upper drainages. Rational analysis of rainfall-runoff and flood routing that must be determined and selected in order to design for exactly hydraulic structural as the conditions precedent a optimal design-rainfall and a precipitation-runoff model and a rainfall-distribution pattern. This study area also were applied to determine the optimized design discharge for rationa1 countermeasure on flood and draught control of reservoir as the drainage area with a inf10w from around catchment of the SIWHA reservoir. Cumulative rainfall-distributions in duration were examined with the analysis methods as well as the distribution chara teristics using a long term data by the precipitation measured stations. As a result, the optimal pattem for cumulative rainfall-distribution in duration was determined by the HUFF method have got maximum precipitation. And rational design flood discharge also can be calculated for the cumulative rainfall of duration by carrying out to a runoff-analysis and a flood routing in study drainage.