Hydrological Response of Semi-arid Degraded Catchments in Tigray, Northern Ethiopia
(2013) EGU Annual Meeting of European Geosciences — Location: Vienna, Austria (8.April.2013)
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- Abstract
- To address water scarcity in the arid and semi-arid part of developing countries, accurate estimation of surface runoff is an essential task. In semi-arid catchments runoff data are scarce and therefore runoff estimation using hydrological models becomes an alternative. This research was initiated in order to characterize runoff response of semi-arid catchments in Tigray, North Ethiopia to evaluate SCS-CN for various catchments. Ten sub-catchments were selected in different river basins and rainfall and runoff were measured with automatic hydro-monitoring equipments for 2-3 years. The Curve Number was estimated for each Hydrological Response Unit (HRU) in the sub-catchments and runoff was modeled using the SCS-CN method at = 0.05 and = 0.20. The result showed a significant difference between the two abstraction ratios (P =0.05, df = 1, n= 132) and reasonable good result was obtained for predicted runoff at = 0.05 (NSE = -0.69; PBIAS = 18.1%). When using the CN values from literature runoff was overestimated compared to the measured value (e= -11.53). This research showed the importance of using measured runoff data to characterize semi-arid catchments and accurately estimate the scarce water resource.
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Citations
Teka Dessie, D., van Wesemael, B., Vanacker, V., & Hallet, V. (2013). Hydrological Response of Semi-arid Degraded Catchments in Tigray, Northern Ethiopia. EGU Annual Meeting of European Geosciences, Vienna, Austria. https://hdl.handle.net/2078.5/231809