Hydrogeological Assessment in Upper Awash Basin With Particular Emphasis to Berga and Kare Catchment, Central Ethiopia
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Date
2014-05-05
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Addis Ababa University
Abstract
The general objective of the research is hydrogeological assessment of Upper Awash basin with particular emphasis to berga & kare river catchment, central Ethiopia.
Berga and Kare rivers catchment is located in west part of Addis Ababa with 72km distance at North and 48 km at south stretch SW to NE between of 8054'00" N to 9018'00" N latitude and 38015'49" E to 38029'33" E longitude. It is a sub-catchment of Awash basin, found at water divide of Awash and Abay drainage basins with total area of 625.3km2.
Using field survey and secondary data analysis method, area description from climatology and geomorphology point of view explained.
The basaltic lava flow Tarmaber Megezaze formation; Trachytic and Rhyolite volcanic rocks, Ignimbrite and Quaternary Alluvial are major geologic units in the area.
The main aquifer visible in the catchment is weathered and fractured basalt. From borehole log and field geomorphological observation the area is mainly covered by volcanic rocks.
Ground water is generally a localized flow system controlled by topography and geology. Water in the catchment is mainly of Ca-HCO3, Ca-Na- HCO3 and Na-CHO3 type. Almost all water in the study area is soft to very hard and TDS is generally below 574mg/L.
All water in the catchment is fresh which is suitable for almost all purposes. Almost all parameters are within the limits of acceptable values of WHO and EU standard/guide line except some hand dug wells showing bacterial pollution due to lack of scheme management
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Hydrogeological, Assessment in Upper, Awash Basin With Particular, Emphasis To Berga, Kare Catchment, Central Ethiopia