Engineering Geological Study on Rib Dam Project, South Gonder (North-Western Ethiopia)
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Date
2005-06
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Addis Ababa Universty
Abstract
Rib Dam project is located in the North-Western part of the Ethiopia, defmed by the
geographic coordinate of 12° 02' 30" N and,37° 59' 45" E. The primary purpose of this dam
project is to provide irrigation to 19000 hectare of land. The proposed dam height would be 54 m
with a crest length of 700 m. The total storage capacity of the reservoir would be about 204 M
m3
.
In the present study engineering geological characterization of soils and rocks of the
study area has been carried out to evaluate the dam foundation condition and the
reservoir water tightness. In addition to this stability condition of the abutment and
reservoir slopes has also been studied. Besides, the suitability of the construction material
available in the vicinity of the project area has also been studied.
The engineering geological appraisal of the dam project has been after carrying out insitu
and laboratory testing on soils and rocks and determining the index and engineering
properties.
Geological maps of the reservoir area and the dam site has been produced at the scale of
1:25000 and I :10,000, respectively. Besides, based on the engineering characterization of
rocks and soils of the area Engineering geological maps were also produced for the dam
site and the reservoir areas on the scale of 1 :2000 and 1: 10,000, respectively.
Thus, based on the engineering geological appraisal of the site the dam foundation area
has problem of seepage at the abutments and settlement at the valley floor area. Hence
certain recommendations to improve the foundation strength and seepage conditions hav~
been made. Besides recommendations on the construction material and the water tightness
of the reservoir have been made. In addition, further detailed studies on the dam
foundation conditions and the reservoir area have been recommended.
Description
Keywords
Rib Dam