Rainfall runoff estimation using GIS and SCS-CN method for awash river basin, Ethiopia

Understanding hydrological behavior is an important part of effective watershed management and planning. Runoff resulted from rainfall a component that needed for efficient water resource In this paper, GIS based SCS-CN runoff simulation model was applied to estimate in Awash river basin. Global Curve Number (GCN250), Maximum Soil Water Retention (S) Rainfall used as input model. The final surface values the basin were generated on basis total annual maximum soil retention potential year 2020. Accordingly, variation range 83.95 mm/year 1,416.75 observed study region. Conversely, recently developed (GCN250) data tested with Pearson correlation coefficient be doing so, predicted using GCN250 validated obtained station gauges results validation show that, well correlated 0.9253. From stand point, it new can at level. Furthermore, analysis performed explain relationship between mean runoff. these two variables indicates strong linear 0.9873.