Modelling rainfall runoff for identification of suitable water harvesting sites in Dawe River watershed, Wabe Shebelle River basin, Ethiopia

• Autorzy: Harka Arus E. , Roba Negash T. , Kassa Asfaw K.

Identyfikatory

DOI

10.24425/jwld.2020.135313

• Języki publikacji: EN

Abstrakty

EN

Scarcity of freshwater is one of the major issues which hinders nourishment in large portion of the countries like Ethiopia. The communities in the Dawe River watershed are facing acute water shortage where water harvesting is vital means of survival. The purpose of this study was to identify optimal water harvesting areas by considering socioeconomic and biophysical factors. This was performed through the integration of soil and water assessment tool (SWAT) model, remote sensing (RS) and Geographic Information System (GIS) technique based on multi-criteria evaluation (MCE). The parameters used for the selection of optimal sites for rainwater harvesting were surface runoff, soil texture, land use land cover, slope gradient and stakeholders’ priority. Rainfall data was acquired from the neighbouring weather stations while information about the soil was attained from laboratory analysis using pipette method. Runoff depth was estimated using SWAT model. The statistical performance of the model in estimating the runoff was revealed with coefficient of determination (R²) of 0.81 and Nash–Sutcliffe Efficiency (NSE) of 0.76 for monthly calibration and R² of 0.79 and NSE of 0.72 for monthly validation periods. The result implied that there's adequate runoff water to be conserved. Combination of hydrological model with GIS and RS was found to be a vital tool in estimating rainfall runoff and mapping suitable water harvest home sites.

Słowa kluczowe

EN

geographic information system; GIS; rainfall runoff; rainwater harvesting; soil and water assessment tool; SWAT; Dawe River watershed; Wabe Shebelle River basin

• Wydawca: Wydawnictwo ITP
• Czasopismo: Journal of Water and Land Development
• Rocznik: 2020
• Tom: no. 47
• Strony: 186--195
• Opis fizyczny: Bibliogr. 46 poz., rys., tab.

Twórcy

autor

Harka Arus E.

• Haramaya University, Haramaya Institute of Technology, Hydraulic and Water Resources Engineering Department, P.O. Box 138 Dire Dawa, Ethiopia

autor

Roba Negash T.

• Haramaya University, Haramaya Institute of Technology, Water Resources and Irrigation Engineering Department, P.O. Box 138 Dire Dawa, Ethiopia

autor

Kassa Asfaw K.

• Haramaya University, Haramaya Institute of Technology, Hydraulic and Water Resources Engineering Department, P.O. Box 138 Dire Dawa, Ethiopia

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Uwagi

Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2021).