The Sultanate of Oman is in one of the world’s semi-arid regions. The Wadi Dayqah project involved
creating a 75m-high roller-compacted concrete (RCC) dam, a 50m-high rock-ll saddle dam, a
100km-long water pipeline and a water treatment works. Sizing the spillway over the RCC dam and
sealing the sandstone bedrock below the dam were the biggest challenges during planning work,
alongside high day-time and night-time temperatures of 45°C to 35°C in summer. During construction
work, ow exceeded 10,000m³/s in the wadi during a tropical cyclone in June 2007. The spillway
had only been designed to handle 7,500m³/s so it had to be adjusted to reect the new conditions.
During the rst impoundment, seepage occurred on the right ank of the rock-ll dam, which would
have jeopardised the dam’s structural safety in the long run. Consequently, the bedrock under the
right valley ank had to be resealed.
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The Sultanate of Oman is in one of the world’s semi-arid regions. The Wadi Dayqah project involved
creating a 75m-high roller-compacted concrete (RCC) dam, a 50m-high rock-ll saddle dam, a
100km-long water pipeline and a water treatment works. Sizing the spillway over the RCC dam and
sealing the sandstone bedrock below the dam were the biggest challenges during planning work,
alongside high day-time and night-time temperatures of 45°C to 35°C in summer. During construction
work, ow e...
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