Volume No. 7 Issue No.: 1A Page No.: 475-483 July-September 2012

 

SUB-BASINS PARTICIPATION RATE IN FLOOD INTENSITY RISE BASIN USING GIS

 

Saeid Shabanlou* and Ahmad Rajabi

Department of Water Engineering, Kermanshah Branch Islamic Azad University, Kermanshah (IRAN)

 

Received on : April 05, 2012

 

ABSTRACT

 

Since, Gorgan river basin is prone to flooding, identifying areas prone to flooding is essential. The present study is a way of using hydrology model and flood risk prone areas within watershed and determining these verities of floods, i.e. to prioritize the rise in each sub-basin or hydrologic units. First, the watershed in GIS environment (GIS) software using Arc- Hydro basin was divided into the following nine, then the physical properties of basins and sub-basins was determined. With data needed for flood hydrographs design for each sub-basin and watershed through the implementation of the entire HEC-HMS model was obtained. With peak discharge under consideration based on watershed and flood index definition for the rise in this research it is proposed, in each model run the efficacy of each sub-basin is removed from the flood routing of basin process and the amount of basin output discharge without participation of the corresponding sub-basin was calculated. In this respect among sub-basins in terms of impact on the flood basin outflow, sub-basin no.W150 is more critical

 

Keywords : Flood rise, Return period, HEC-HMS, Arc- Hydro, Watershed

 

 

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