Browsing by Author "Dure, Mulatu"

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    Modeling for Inter-Basin Groundwater Transfer Identification between Middle Abay River Basin and Upper Awash River Basin
    (Addis Ababa University, 2017-06) Dure, Mulatu; Mebruk, Mohammed (PhD)
    Groundwater flow models are important for the identification of inter-basin groundwater transfer between adjacent basins. Numerical groundwater model, TAGSAC has been used to study the inter-basin groundwater transfer (IBGWT) between middle Abay River basin and upper Awash River basin. Three steady state groundwater flow models (for middle Abay River basin, upper Awash River basin and for the two combined basins) were first created and calibrated for the inventoried wells. The first two models were created by considering the surface water divide between the two basins as a no flow boundary. The third model avoids the surface water divide which justifies IBGWT. The calibration target for this study was the hydraulic head; hydraulic conductivity and surface recharge were used as calibration parameters. The goodness of fit indicators (GoFIs) that was obtained for the third model was better than the other two models. This indicates the evidence of IBGWT between the two basins; i.e. groundwater flows from middle Abay River basin to Upper Awash River basin and from Upper Awash River basin to middle Abay River basin. In addition, the groundwater head distribution for third model showed that the groundwater divide and surface water divide were not coincident. And groundwater is easily accessed within a shallower depth in the Upper Awash River basin compared to the middle Abay River basin.