Dam Safety Monitoring of Gilgel Gibe III Hydropower Dam Project
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Date
2017-06
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Addis Ababa
Abstract
Dam safety monitoring tool determines a functional performance of dams with an
extended service time. One of the main dam safety monitoring tools is seepage
monitoring system. This research presents assessment of dam safety monitoring
technique using seepage observed at Gilgel Gibe III hydropower project the highest
RCC dam in the world. SEEP/W a component of GEO-STUDIO 2007 have been used
to do the seepage analysis. A number of hydraulic conductivities are used to find out
different trial seepage values. Trial seepages were produced for different reservoir
water level for trial hydraulic conductivity from SEEP/W model. These calculated
seepage values together with the measured seepage from the dam site are an input
for Multiple Linear Regression Model (MLR). Then, the MLR coefficients were
calculated by optimizing the seep/w results with the measured seepages for a given
water level in the dam. The model result concides with the measured result with Mean
error of -4.020x10-2m3/s, mean absolute error of 5.65x10-3 m3/s RMSE of 7.18x10-3
m3/s and ���� value of 0.91. The RMSE, Mean error and Mean absolute error being
closer to zero indicate the quality of model to represent acctual condution. While the ����
value being the 91 % shows the better quality of the representative model. Then a
model is developed and accurately predicts the expected seepage with different
specific reservoir level. Using the model, safe expected seepage is produced for the
safe future monitoring of the dam. By using these calibrated MLR coefficient and
seep/w model seepage a monitoring curve is developed. The curve obtained can be
used to monitor the dam safety against seepage for future operation.
Key words
Gilgel Gibe III dam, SEEP/W, MRL, Reservoir water level, Hydraulic conductivity.
Description
Keywords
Gilgel Gibe III dam, SEEP/W, MRL, Reservoir water level, Hydraulic conductivity