In the eastern part of Guraghe, bounded by Meki and Weja River, Irrigation practice increasesrnusing pumping technology. This alarming increasing of pumping groundwater for irrigationrnpurpose has resulted in:-The reduction of groundwater potential in the groundwater basin and dryrnup of streams, rivers nearby. Such aggressive groundwater abstraction will result conflictsrnbetween the users of groundwater and rivers. Thus it is vital to understand the impact of suchrngroundwater abstraction on its availability and decide on the optimum abstraction rate.rnTo assess the impact of groundwater abstraction in its availability and nearby rivers a 3Drnconceptual groundwater model is created. This conceptual model consists of the catchmentrndivide in the west (guraghe High Mountain) and two adjacent rivers (Weja and Meki rivers). Therncatchment divide is taken as a hydraulic â€“Neumann-boundary and the two adjoin rivers are takenrnas dirichelet- boundary. The bottom and groundwater surface is between these boundaries isrntaken as a flux-boundary. Whereby the top ground takes recharge while the bottom is taken as arnno-flow boundary. The four different geological strictures found are consider as different hydrorngeologic settings where by hydraulic conductivity is assigned as a trial value, to make sure thatrnthe hydraulic heads collected in 94 hand dug wells in the study area are estimated reasonably.rnThe above conceptual model is used as an input of TAGSAC software whereby the model arearnis decertified in to 22301 nodes and 21710 triangular prism elements of 200mx200mx200m allrnthe 94 inventoried wells were represented by nodes. Thiesson polygon based on rainfallrndistribution is also used as an input but with a reduced rate to represent the effective recharge.rnThe four different geologic setting were also represented by the finite elements generated, so thatrndifferent hydraulic conductivity is given to each of the four geologic settings.rnThe model is calibrated with, 8.74m, 7.45m, 0.83 RMSE, ME and R2 values respectively. Afterrncalibration the impact of pumping is analyzed by assigning the current groundwater abstractionrnrate 21,186,913m3/year to the nodes representing the impact zone. The result clearly shows thatrnthe region of influence reaches the existing perennial river. Thus the current trend of pumpingrnwill result in drying up of these rivers. To come up with optimum pumping rate trial values wererngiven to the model area representing the pumping site. An optimum pumping rate ofrn16,666,214m3/year would minimize the impact of pumping on the adjacent rivers.rnKeywords: Groundwater, Guraghe Zone, Numerical modeling, Optimum pumping rate,rnTAGSAC