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Title: Groundwater Resources Evaluation and Management in Dugda Woreda, Central Rift Valley, Ethiopia
Authors: Netsanet, Kassa
Advisors: Seifu Kebede (Ph.D)
Copyright: 2007
Date Added: 12-Dec-2008
Publisher: Addis Ababa University
Abstract: This study covers two parts where the first part deals with groundwater potential assessment of Meki river catchment and the second part which is the main focus of the study deals with assessment of sustainability problems of developed water supply schemes in Dugda woreda( i.e part of Meki river catchment). Meki river catchment is found with in the Main Ethiopian Rift in the northern sector of the Lakes region. The average monthly Maximum and minimum temperature of the area are 25.8 oc and11.4 oc, respectively. Its mean annual aerial depth of precipitation is 992mm. Potential evapotranspiration for the area is calculated using Penman and Thornthwaite gives annual potential evapotranspiration value of 1242.8 mm/year and 827mm/year, respectively. Actual evapotranspiration for the area estimated, from Turc method gives a valueof 754mm.While actual evapotranspiration using Soil-water balance (Thornthwaite and Mather) method is 732 mm. The overall water balance of the study area was computed with an aim of estimating the amount of annual recharge to the groundwater. Accordingly; annual recharge to the ground water of the study area is approximated to be 116.7mm. The main aquifer formations of the boreholes are lacustrine deposits, weathered and fractured Basalt, ignimbrite, and welded tuff. The general trend for groundwater flow observed from pieziometric heads is from western highlands toward the rift floor in the direction of NW to SE of the study area. Groundwater type of the area evolves from Ca-Na HCO3 water type in the western highlands and escarpments to Na-HCO3 water type in the rift floor (i.e. towards lake Ziway) of the study area. The sustainability challenge of developed water supply schemes is conducted in Dugda woreda. Five representative PA’s which can characterize the whole water supply sustainability problem of the woreda were chosen. The main source of drinking water for the woreda is groundwater. Currently there are seventy-five developed water supply schemes; where thirty-eight point eight percent are boreholes, thirty-four point six percent are windmills and twenty-six point seven percent are hand pumps. Twenty-six point six percent of these developed schemes have failed to meet their objectives. Local community in the study area also develop 2162 dug wells individually which could result in depletion of the resource. Findings of the study reveal that Poor quality (high fluoride concentration) of water is the main cause for ninety-one percent failures of developed water supply schemes. Findings of the study reveal that ninety-five percent of the water supply schemes are managed by water committees. Lack of training for the professionals, water managers, community and local operators is other reason for sustainability problem of the woreda. Result of the study shows that ninety-four percent of interviewed technical staffs clarify that the existing training and staff mobility strategy doesn’t allow professionals to improve their skills. Eighty-five percent of respondents explain, they didn’t obtain any kind of training. In addition there is high shortage of skilled human resource, budget, and logistics in the rural water supply office of Dugda woreda. There is no clear system for monitoring and supervision of schemes by the office. Little role of local communities was seen during water supply development activities; besides Women participation at the time of development of water supply schemes and after development is completed is insignificant. All the above mentioned factors plays significant role for the failure of the developed water supply schemes. A finding of the study also show investing on knowledge of professionals is first priority of beneficiaries to minimize the rate of failure of water supply schemes.
Description: A Thesis Submitted To Addis Ababa University School of Graduate Studies for the Partial Fulfillment of M.SC Degree in Hydrogeology
URI: http://hdl.handle.net/123456789/1666
Appears in:Thesis - Earth Sciences
Thesis - Earth Sciences

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