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Estimation of groundwater recharge using a GIS-based distributed water balance model in Dire Dawa, Ethiopia

Estimation of groundwater recharge using a GIS-based distributed water balance model in Dire Dawa, Ethiopia

Hydrogeology Journal 17(6): 1443-1457

Sustainable groundwater management requires knowledge of recharge. Recharge is also an important parameter in groundwater flow and transport models. Spatial variation in recharge due to distributed land-us.e, soil texture, topography, groundwater level, and hydrometeorological conditions should be accounted for in recharge estimation. However, conventional point-estimates of recharge are not easily extrapolated or regionalized. In this study, a spatially distributed water balance model WetSpass was used to simulate long-term average recharge using land-use, soil texture, topography, and hydrometeorological parameters in Dire Dawa, a semiarid region of Ethiopia. WetSpass is a physically based methodology for estimation of the long-term average spatial distribution of surface runoff, actual evapotranspiration, and groundwater recharge. The long-term temporal and spatial average annual rainfall of 626mm was distributed as: surface runoff of 126mm (20%), evapotranspiration of 468mm (75%), and recharge of 28mm (5%). This recharge corresponds to 817l/s for the 920.12 km2 study area, which is less than the often-assumed 1,000l/s recharge for the Dire Dawa groundwater catchment.

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Accession: 024631809

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DOI: 10.1007/s10040-009-0455-x

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