Abstract
Dams have one of the greatest significant roles in operating water resources. Seepage and slope stability failures cause completely failure of embankment dams. Dam disasters not only hazard community safety, they also can cost our economy millions of dollars in compensations. The study area is found in Oromia regional state between East Wollega and Bunno Bedele Zone. The dam is located on Dedessa River, tributary of Blue Nile River. Analysis of seepage quantity was done by Darcy’s phreatic line, and SEEP/W software model for both homogeneous and zoned dam. The expected quantity of seepage estimated with the SEEP/W software model analysis that includes foundation seepage is 6.6*10<sup>-6</sup>m<sup>3</sup>/sec. Slope stability study is to contribute to the safe and economic design of upstream and downstream slope of the dam. The factory of safety obtained by Morgenstern-Price method for end construction is (FOS=1.99), for steady state (FOS=2.03) and rapid drawdown (FOS=2.91). However, at the design document shell material hadn’t been designed properly. Finally the paper concluded that the likely corrective measures for seepage controls are impermeable blanket, grouting, and the downstream slope miscarriage by eliminating the pathetic zone and seal with like graded quantifiable, regular repairs and shield the downstream slope with grasses.
Highlights
A dam is a obstacle that blocks the flow of water and produces a reservoir
Seepage causing problems that can lead to dam failure are piping through dam body or foundation and sloughing of downstream side of dam [9]
The analysis considered the dam with filter drainage system and neglected the impact of foundation seepage
Summary
A dam is a obstacle that blocks the flow of water and produces a reservoir. The water kept in the reservoir is used for various purposes, such as irrigation, municipal and industrial supply, hydropower and recreation. According to Yazdanian report [14] Slope stability analysis of earthen dam is dependent to many parameters which must consider in design and construction. Investigating of slope stability of earthen dam slopes is an advanced procedure which has been shown to lead to a more economical design by many researchers which states that the cases that computed safety factor without modeling uncertainties is more than reality value. These methods do not consider many uncertainties in their computation
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