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Subject: search.filters.subject.Groundwater potential

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    ASSESSMENT OF GROUNDWATER POTENTIAL ZONES: THE CASE OF WOGAYI WATERSHED IN THE OMO-GIBE RIVER BASIN, ETHIOPIA
    (Hawassa University, 2023-08-10) WUBISHET SISAY WOLDEYES
    This study was aimed at assessing the groundwater potential of Wegayi watershed in the Omo Gibe river basin. Secondary data: climate, topography, well log information and different thematic layers were used. The thematic layers considered in this study are geology, geomorphology, drainage density, lineament density, rainfall, soil types, slope and land use/cover. Arc GIS and Surfer 20 softwares were used to produce spatial maps of the different thematic layers and water table contours respectively. The geological formation of the catchment was evaluated using existing well logs data of the boreholes. The groundwater flow direction of the catchment was identified by using ground water level maps. The Saaty analytical hierarchy process (AHP) method was implemented to identify the groundwater potential zones based on their relative assigned weights. Eventually, the weights were normalized so as to indicating on their importance in groundwater occurrence. The major lithological units of the area are weathered and fractured basalts. These types of geological formation are recognized to be good groundwater formations. According to the groundwater flow lines and the ground water contour maps produced in the catchment, the groundwater flows from southern and eastern parts of the highlands of the catchment towards the plain areas of the northwestern parts of the catchment. The hydraulic characteristics are variable throughout the catchment. According to the result of groundwater potential map, the major recharge of groundwater occurs in the Easter and southwestern highlands of the catchment, which is said to be recharging zone. However, the area situated in the southeastern, northwestern and northeastern parts of the catchment is discharge zones. The results of AHP indicate that 58.12% moderate, 20.82% high, 21.03% low and 0.032% very low groundwater potential zones have been identified. Finally, it is concluded that the integrated GIS and remote sensing techniques are very efficient and useful for the identification of groundwater potential zones
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    GROUNDWATER POTENTIAL MAPPING USING GIS AND REMOTE SENSING: A CASE STUDY IN WEYIB SUB-BASIN, GENALE-DAWA RIVER BASIN, SOUTHEAST ETHIOPIA
    (Hawassa University, 2021-08-12) ABDULGEFAR MUHIDIN MOHAMMED
    To fulfill the demand of a rapidly growing population in drought-prone areas with high rate of urbanization, identification and management of groundwater resources are required. In the Weyib Sub-basin, a search for an alternative source of water has been always a major issue. The current practice of groundwater potential zone (GWPZ) identification is time-consuming and uneconomical. Therefore, it is required to apply effective techniques for proper evaluation of groundwater resources. This study applied integration of GIS-Remote Sensing (RS) and Analytical Hierarchy Process (AHP) for mapping the GWPZ of Weyib Sub-basin, Southeast Ethiopia. For this purpose the physiographic, geology and climatic factors influencing GWPZ of the study area were characterized. The thematic maps of geomorphological landforms, lineament density, geology, rainfall distribution, drainage density, elevation, slope, LU/LC and soil texture were prepared. System for automated geoscientific analysis (SAGA) GIS, PCI Geomatics, Rockworks 16, IDRISI Selva and Surfer 17.1, were employed for landform classification, lineament extraction, rose diagram preparation, pairwise comparison of the factors and identification of groundwater flow direction, respectively. The AHP technique of Multi-criteria decision analysis (MCDA) was employed to determine the relative weight and influences of the thematic layers. Geomorphologic landform, lineament density, geology, and rainfall distribution were found to be the dominant factors sharing the highest weightage of 67%. A weighting overlay approach of GIS was utilized to overlay the thematic maps. The resulting GWPZ of the study area indicates five zones representing very high, high, moderate, poor and very poor GWPZ. The areal extent of very high and high GWPZ is 41 km2 and 2032 km2, respectively. Moderate, poor and very poor GWPZ covers 2088 km2, 252 km2 and 0.142 km2 areas. The particular direction of groundwater flow is towards the NE and SE, coinciding with the direction of surface water flow. It was controlled by NW-SE striking geologic structures. The delineated GWPZ map is verified by using the existing water point’s inventory data. It indicates a good prediction accuracy of 84%. Thus, the identification of GWPZ by using GIS and RS through AHP is reliable for conducting similar studies