Abstract
The water resources availability assessment required for determination of optimal allocation and planning of water resources. This study is mainly focus on the water resources availability in the Fincha and Didessa sub-basin of Ethiopia by using HEC-HMS. The performance of the model was assessed via calibration at gauging station using Relative Volume Error (D), coefficient of determination (R 2 ) and Nash-Sutcliffe Efficiency (NSE) performance coefficients. Then the model was validated using the parameters optimized during model calibration. The availability of water resources assessed at different watershed created to see at local level and finally at outlet point to Main River for each sub-basin separately. The HEC-HMS model shows a good performance Little anger which resulted D=2.58, R 2 =0.75 and NSE=0.63 during calibration and D=4.32, R 2 =0.77 and NSE=0.46 during validation and Neshi D=-1.37, R 2 =0.53 and NSE=0.58 during calibration and D=6.98, R 2 =0.68 and NSE=0.58 during validation for Didessa and Fincha Sub basin respectively. The parameters optimized at little Anger and Neshi gauging station was used for flow simulation to assess water resources availability on monthly and annual basis. The flow components were also separated at small catchment considered for all sub-basin. The result shows that high percentage of flow occupied by Direct Runoff for both Didessa and Fincha sub basins. So the available water in the sub-basins should be allocated fairly and accurately for water resources projects for effective utilization of the country water resources. Keywords: Fincha and Didessa sub-basin, HEC-HMS, Water Resources Availability. DOI: 10.7176/JEES/10-11-05 Publication date: November 30 th 2020
Highlights
1.1 General The water resources availability assessment requires detailed insights into hydrological processes
4.1 HEC-HMS Model Calibration and Validation Results In this research, among the existing methods in the model, the Nelder and Mead Method (NM) and the sum of squared residuals measure for goodness of fit have been applied for calibrating the model
Didessa gauging and little anger were used for Didessa sub-basin where as Neshi and Fincha gauging station were used for Fincha sub-basin
Summary
1.1 General The water resources availability assessment requires detailed insights into hydrological processes. Studying the complexity of hydrological processes, needed for sustainable sub-basin management, is basically based on understanding rainfall characteristics and Sub-basin properties, for which rainfall–runoff modeling studies are useful. Rainfall–runoff models have been widely used in hydrology over the last century for a number of applications and play an important role in in optimal planning and management of water resources in basin (Makkeasorn, 2008). The availability of adequate fresh water is a fundamental requirement for the sustainability of human and terrestrial landscapes. The importance of understanding and improving predictive capacity regarding all aspects of the global and regional water cycle is certain to continue to increase. One fundamental component of the water cycle is streamflow. Forecasting stream flow under climate change is very indispensable (Makkeasorn, 2008)
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