The Sultanate of Oman is in one of the world’s semi-arid regions. The Wadi Dayqah project involved creating a 75m-high roller-compacted concrete (RCC) dam, a 50m-high rock-ƒll saddle dam, a 100km-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, Šow exceeded 10,000m³/s in the wadi during a tropical cyclone in June 2007. The spillway had only been designed to handle 7,500m³/s so it had to be adjusted to reŠect the new conditions. During the ƒrst impoundment, seepage occurred on the right Šank of the rock-ƒll dam, which would have jeopardised the dam’s structural safety in the long run. Consequently, the bedrock under the right valley Šank had to be resealed.     «

The Sultanate of Oman is in one of the world’s semi-arid regions. The Wadi Dayqah project involved creating a 75m-high roller-compacted concrete (RCC) dam, a 50m-high rock-ƒll saddle dam, a 100km-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, Šow e...     »