Groundwater–Surface Water Interaction in The Case of Lake Ziway Catchment
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Date
2016-05
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Addis Ababa
Abstract
Lake Zeway catchment is located in the northern part of the Central Main Ethiopian rift
valley bounded in west and north by Awash basin; and in east by Wabi shebele
catchment. Meki and Katar are the main rivers draining western and eastern part of the
catchment respectively and both feed Lake Ziway before outflow to Bulbula River in
south west. According to the data collected from the National Meteorological Service
Agency area has mean annual precipitation, potential evapotranspiration and actual
evapotranspiration of 887mm, 1284mm and 856mm respectively.
Direct groundwater recharge of the catchment was estimated using soil moisture
budgeting method.
Groundwater and surface water interaction in the area have been analyzed using
groundwater table contour method. The analysis result shows that Meki River in volcanolacustrine
deposit of rift floor and Katar River in Upper and Central Wonji Fault Belt are
loosing reaches. In the rest of the catchment areas, the rivers and streams are gaining
reaches. This facts are important in identifying the reaches which are continuously
recharged by the ground water. These reaches are favorable for abstraction because their
potential is continuously being recharged. On the other hand for the loosing reaches this
information helps us to avoid over abstraction.
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Zeway catchment is located