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| dc.contributor.author | Samuel, Belay Alamne | |
| dc.date.accessioned | 2021-10-21T08:39:46Z | |
| dc.date.available | 2021-10-21T08:39:46Z | |
| dc.date.issued | 2020-07-28 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12840 | |
| dc.description.abstract | Groundwater is one of the most important natural resource that provide a source of drinking water, household use, sanitation and hygiene, irrigation and industries and in generally it, provides a basis for economic growth. Therefore, its protection and management are vital for sustainable socioeconomic development. Contamination of groundwater often occurs in urban and industrial area due to anthropological activities. Contaminants vulnerability risk mapping is an essential component of sustainable management of aquifer and the groundwater. Groundwater constitutes a significant portion of the water supply system for the Bahir Dar City, Ethiopia. Nitrate and phosphate are the most contaminates present in the groundwater. Both point and non-point source of pollution contribute to nitrate and phosphate contamination of groundwater. A field survey was conducted by collecting samples from boreholes for contaminant analysis. Digital Elevation Model, lithology, land cover and a soil data were obtained and used for contaminant risk mapping. This study employed Geographical Information System (GIS) integrated with the modified DRASRIC model to investigate the vulnerability of groundwater to Nitrate and Phosphate contents in Bahir Dar city in three different methods. First, an intrinsic and specific vulnerable map was developed using the modified DRASTIC model,; A total of eight parameters were used to evaluate the vulnerability of groundwater to phosphate and nitrate contaminant: depth to groundwater, net recharge, and impact of vadose zone media, soil media, topography, aquifer media, the permeability of the aquifer and land use data. Secondly, the spatial distribution of nitrate and phosphate contaminants. Third, the DRASTIC model was modified using the actual nitrate concentration. The reduced modified rate and weight Pearson correlation 0.55 compared to 0.26 original DRASTIC model. The integrated vulnerability map showed high risk in the central part of the City due to flat slope and depth to groundwater near to the surface. In addition, sensitive analysis indicated that the removal of aquifer media and impact of vadose were found to have less effect and important compared to other variable as expected. The Pearson correlation between analytical hierarchy process DRASTIC Index and Nitrate measurement was 0.53. For future uncertainty, assessment needs to improve the vulnerability index. | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | CIVIL AND WATER RESOURCE ENGINEERING | en_US |
| dc.title | GROUNDWATER NITRATE AND PHOSPHATE CONTAMINANT RISK MAPPING FOR BAHIR DAR CITY | en_US |
| dc.type | Thesis | en_US |
