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Groundwater quality, vulnerability and potential assessment in Kobo Valley development project, Ethiopia
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Resumo(s)
This study deals with investigating the groundwater quality for irrigation purpose, the
vulnerability of the aquifer system to pollution and also the aquifer potential for
sustainable water resources development in Kobo Valley development project. The
groundwater quality is evaluated up on predicting the best possible distribution of
hydrogeochemicals using geostatistical method and comparing them with the water
quality guidelines given for the purpose of irrigation. The hydro geochemical
parameters considered are SAR, EC, TDS, Cl-, Na+, Ca++, SO4
2- and HCO3
-. The
spatial variability map reveals that these parameters falls under safe, moderate and
severe or increasing problems. In order to present it clearly, the aggregated Water
Quality Index (WQI) map is constructed using Weighted Arithmetic Mean method. It
is found that Kobo-Gerbi sub basin is suffered from bad water quality for the irrigation
purpose. Waja Golesha sub-basin has moderate and Hormat Golena is the better
sub basin in terms of water quality. The groundwater vulnerability assessment of the
study area is made using the GOD rating system. It is found that the whole area is
experiencing moderate to high risk of vulnerability and it is a good warning for proper
management of the resource. The high risks of vulnerability are noticed in Hormat
Golena and Waja Golesha sub basins. The aquifer potential of the study area is
obtained using weighted overlay analysis and 73.3% of the total area is a good site
for future water well development. The rest 26.7% of the area is not considered as a
good site for spotting groundwater wells. Most of this area fall under Kobo-Gerbi sub
basin.
Descrição
Palavras-chave
WQI GOD Rating System Vulnerability Geostatistical Method Weighted Arithmetic Mean Aquifer Potential Spatial Variability Weighted Overlay Analysis