Ground Water Resources Evaluation Of Walga River Basin Central Ethioipia South West Shoa

Hydrometreological, geological, hydrogeological, hydrochemical investigation, basin & lakernwater balance calculation were made for groundwater resource potential evaluation of WalgarnBasin.rnWalga basin is part of the western central Ethiopian plateau.Geological investigations revealrnthat Walga area is found in the east-west trending Yerer-Tullu Welel volcano –tectonicrnstructures and three litho-stratigraphic succession prevail in the area, which includernPrecambrian basement, Mesozoic sedimentary rocks and Cenozoic volcanics.rnAnnual precipitation of the basin calculated from long term mean monthly rain fall data isrn1259mm.The actual and potential evapotranpiration for the basin are 853mm and 1080mmrnrespectively. The amount of evaporation from open water body (lake) is 6.6 Mcm.Of therntotal rain fall ,17.9% leaves the basin in the form of surface runoff and 13.8 % waterrninfililtrate with in the basin which is the annual recharge of the basin.rnMost perennial streams emerge from the base of mountains in this area and drain the basin asrngaining streams throughout & showing structurally controlled frow path.This also indicatesrnthat groundwater plays very crucial role in the hydrology of the basin.rnBased on qualitative and quantitative analysis of aquifer characterstics,the basin isrncategorized in to three aquifer sytemswhich are low,medium & high productivityrnaquifers.The scoraceous basaltic aquifer around Woliso area is the best well field with highrnwell yield & permeability.rnHydrogeological and geological maps are prepared from areal photographs and Satelliternimages & Field observations.Land sat –TM image is used also to identify lineament orrnstructures in the basin together with areal ophotographs.

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