Abstract
Abstract. Runoff is one of most important hydrological variables that are used in many civil works, planning for optimal use of reservoirs, organizing rivers and warning flood. The runoff curve number (CN) is a key factor in determining runoff in the SCS (Soil Conservation Service) based hydrologic modeling method. The traditional SCS-CN method for calculating the composite curve number consumes a major portion of the hydrologic modeling time. Therefore, geographic information systems (GIS) are now being used in combination with the SCS-CN method. This work uses a methodology of determining surface runoff by Geographic Information System model and applying SCS-CN method that needs the necessary parameters such as land use map, hydrologic soil groups, rainfall data, DEM, physiographic characteristic of the basin. The model is built by implementing some well known hydrologic methods in GIS like as ArcHydro, ArcCN-Runoff for modeling of Zilberchai basin runoff. The results show that the high average weighted of curve number indicate that permeability of the basin is low and therefore likelihood of flooding is high. So the fundamental works is essential in order to increase water infiltration in Zilberchai basin and to avoid wasting surface water resources. Also comparing the results of the computed and observed runoff value show that use of GIS tools in addition to accelerate the calculation of the runoff also increase the accuracy of the results. This paper clearly demonstrates that the integration of GIS with the SCS-CN method provides a powerful tool for estimating runoff volumes in large basins.
Highlights
The determination of the runoff value is necessary for designing of dams, reservoir management and prediction of risks and potential losses caused by flooding
The curve number is a function of land use and hydrologic soil group (HSG)
According to above in this study, Zilberchai runoff is estimated by using Geographical Information System (GIS) tools including ArcCN-Runoff for determining curve number of the basin that is based on land use and hydrological soil groups, interpolation tool (IDW) for determining 24-hour rainfall for the basin as a raster, raster calculator for determining runoff height based on SCS methods and ArcHydro for calculating runoff
Summary
The determination of the runoff value is necessary for designing of dams, reservoir management and prediction of risks and potential losses caused by flooding. Mishra and Singh (2003), Ramasubramaniam et al (2008), Ebrahimian and Abdul Malek (2009), Amutha and Porchelvan (2009), Domnita et al (2010), Dhawale (2013), estimated runoff with SCS method and they are used GIS to obtain the factors for determining runoff depth and curve number and in all of these studies, the results have been satisfactory. According to above in this study, Zilberchai runoff is estimated by using GIS tools including ArcCN-Runoff for determining curve number of the basin that is based on land use and hydrological soil groups, interpolation tool (IDW) for determining 24-hour rainfall for the basin as a raster, raster calculator for determining runoff height based on SCS methods and ArcHydro for calculating runoff. Interpolation tools and raster calculator were used for preparing all of data for estimating runoff
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