http://ir.bdu.edu.et/handle/123456789/10824 Sat, 13 Jan 2001 06:17:46 GMT 2001-01-13T06:17:46Z http://ir.bdu.edu.et/handle/123456789/15433 Groundwater Potential and Water Quality Assessment of Hotta River Catchment, Tekeze River Basin, North West Ethiopia Alemu Ferede The Hotta catchment is found in Northwestern part of Ethiopia in North Gondar basin of the Upper Tekeze Basin. This catchment is one of the areas where groundwater is the main sources of water supply for domestic and irrigation purposes. In hydrogeological context, the Hotta River catchment is not a studied catchment. This study aimed to assess the groundwater potential and water quality of Hotta catchment using GIS-based Multicriteria decision-making (MCDM) analytic hierarchy process (AHP) and water quality techniques as methods for assessing and classifying the groundwater potential and water quality of the study area. Eight hydrological and hydrogeological criteria were used as thematic layers, namely, geology, rainfall, geomorphology, drainage density, slope, lineament density, land use, and soil texture. Groundwater-potential-zone evaluations of the study area showed as: very high (11%), high (4%), moderate (16%), low (35%), very low (34%); and groundwater potential zone (GWPZ) maps of the catchment were prepared. The water quality assessment was carried out against WHO and Ethiopian standards for domestic use and irrigation purpose. The major ion concentration belongs to the suitable category for drinking and irrigation purposes based on WHO and MoWR standards. The calculated results of the WQI indicate that the majority of samples are comprised as good water class, which covers 83.33% of the total samples. The other WQI water class type is classified as excellent water type which covers 16.67% out of the total samples in the study area. The irrigation water quality parameters indicated that the majority of the water samples are suitable for irrigation purposes. Based on SAR and MH calculated results the samples are classified as excellent and suitable, respectively. The KR values indicate the majority samples (N=10) are suitable and fewer samples (N=2) are grouped under unsuitable and based on Na% values the majority samples fall under suitable in the study area. Tue, 01 Nov 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15433 2022-11-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/15427 Groundwater Potential and Water Quality Assessment of Cheleka River Catchment, Northeast Ethiopia Gosa Teshome The Cheleka River catchment is located in the Northeast part of Ethiopia, particularly in the Amhara national regional state with areal coverage of 476 km 2 . The objective of the study is to carry out a detailed groundwater potential assessment and Quality of the alluvial and fractured aquifers. Development of groundwater in the area before the detailed investigation will expose the groundwater resource of the catchment to risk, and ultimately a problem threatening the water supply becomes foreseeable. Different approaches have been used to quantify the main hydrometeorological components and estimate the recharge amount of the catchment. The annual rainfalls of the study area were analyzed by using Arithmetic and Isohyetal methods from existing meteorological point data, found nearby and within the study area. A total of 8 thematic layers were prepared and studied for groundwater potential zone demarcation using analytical hierarchical process techniques (AHP). Weights assigned to each class in all the thematic maps are based on their characteristics and water potential capacity through the AHP method. The major lithological units identified in the study area are volcanic rocks and alluvial deposits. The actual evapotranspiration of the catchment is calculated by evaluating the land use land cover type, soil texture, and their areal proportion and is computed to be 741.2 mm per year. The annual runoff of the catchment is 173mm and the annual recharge to the groundwater by soil water balance and chloride mass balance methods is 98.3 and 108mm/year respectively. Groundwater potential of the study is categorized into five categories as very high, high, moderate, low and very low of groundwater potential zone. Very low groundwater potentials cover 92.37 km of northwestern highlands of the study area, and low groundwater potential covers 138.63 km . Moderate groundwater potentials cover 162.31 km 2 covers northeastern and eastern plateaus of the area. High to Very high groundwater potentials are covers 59.15 km 2 and 23.54 km 2 , respectively to the central lowlands of Degan area and the north western of the study area. The dominant Water types in the catchment are Ca-HCO3, Ca-Na-HCO3, Ca-Mg-HCO3, and Na-Ca-SO4-HCO3. The water sources from boreholes and springs in the study area are free from any pollution and hence fit for drinking purposes and for irrigation use. This study can provide inputs for groundwater development activities, further studies and future sustainability use of the resource. 2 2 Tue, 01 Nov 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15427 2022-11-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/15426 Groundwater Potential and Water Quality Assessmentin in Atayesenbete River Catchment, North East Ethiopia. Shishigu Biset This research evaluates the groundwater potential, both quantitatively and qualitatively, in Ataye-Senbete river catchment (344 km North Shewa Zone and Oromia Special Zone. 2 ), which is located in Amhara National Regional State, Geologically the catchment is covered by volcanic rocks and alluvial sediment.Fractures that have orientations NW-SE and NE-SW are the major geological structures found in the study area. Geology, Rainfall, Slope, Lineament Density, Land use Land cover, Drainage Density and Soil were selected to delineate the groundwater potential zones of the study area. The groundwater potential zone map in the study area is categorized into five different zones. The annual rainfalls of the study area is analyzed by using Isohyetal method from existing meteorological point data and the value is 1294 mm. The Penman formula (1271mm), and Turc (967mm) and soil water balance method (916mm) were used for determination of the potential evapotranspiration and actual evapotranspiration respectively.. For runoff estimation, the method employed was runoff coefficient, and the runoff value is 65.4 mm. The methods used for recharge estimation are soil water balance (SWB) and chloride mass balance (CMB).Recharge rates of 312.8 and 277.8 mm/year have been estimated based on analysis of soil water balance (SWB) and chloride mass balance (CMB) methods, respectively. The dominant Water type in the study area is Ca-HCO 3 , Ca-Mg-HCO 3 , Ca-Na-HCO 3, Na-CaHCO 3 and Na-HCO 3 -SO 4 .The water sources from boreholes and springs in the study area are free from any pollution and hence fit for drinking purpose, In addition the water sources of the catchment have appropriate water quality for irrigation use. Tue, 01 Nov 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15426 2022-11-01T00:00:00Z http://ir.bdu.edu.et/handle/123456789/15425 Groundwater Recharge Estimation Using Soil Moisture Balance and Chloride Mass Balance Methods on Upper Bashilo River Catchment, South Wollo Zone, North Central Ethiopia. Tarekegn Aragie Groundwater recharge estimation is the critical importance for groundwater resources evaluation and management. In the study area, there is lack of understanding the groundwater recharge amount, rate, mechanism and spatial variability. Because the area has not been studied previously in terms of groundwater recharge. The main objective of this study was to estimate the groundwater recharge of the catchment. To estimate the groundwater recharge, DEM, rainfall sample, and groundwater sample data were collected. A set of hydro-meteorological data for the period of 2004 to 2019 years and physical characteristics of the catchment such as land use/land cover, and soil type data were collected from different sources. There are several methods for estimating groundwater recharge. Among these, soil moisture balance (SMB) and chloride mass balance (CMB) methods are used in this study. Using the long-term mean monthly precipitation data, the mean annual rainfall of the catchment was calculated at 1340 mm/year. Potential evapotranspiration (PET), actual evapotranspiration (AET) and runoff were found to be 1097.6 mm/y, 721mm/y and 402mm/y, respectively. The groundwater recharge rate for the catchment using soil moisture balance is 217 mm/y which represents 16.3% of the mean annual rainfall of the catchment while using chloride mass balance has given 240mm/y which accounts for 18.1% of the mean annual rainfall. The results show that the recharge amount estimated by the two methods are compariable with the average value of 228.5 mm/y. Mon, 01 Aug 2022 00:00:00 GMT http://ir.bdu.edu.et/handle/123456789/15425 2022-08-01T00:00:00Z