Abstract
The Sultanate of Oman is a semi-arid country with few permanent surface-water resources. Wadi Dayqah is unique in Oman with the perennial flow around 1,5 m3/s. Severe storms result in flush floods. The catchment area extends 1 700 km2 with an average rainfall of 150 mm/year. Studies identified a potential site across a gorge above Mazara village, some 100 km south-west of the capital Muscat. A RCC dam 75 m high and an adjacent secondary saddle dam provide 100 million m3 of storage, sufficient for a yield of 35 million m3 per annum of portable water delivered by a pipe line to the capital of Muscat. The site of the Main Dam is exposed limestone that of the saddle dam comprises inter-bedded soft fine sandstones and claystones. Cyclone Gonu caused a flush flow with 10 000 m3/s which exceeded the assessed 1:10000 year flood on which the design of the spillway had been based. The design revision comprised an increase of spillway length by 6 m and provision of a parapet wall on the upstream edge of the dam road crest comprising counterbalanced precast concrete units.
| Translated title of the contribution | Water reservoir Wadi Dayqah in Oman - Lessons learnt from design, construction and operation |
|---|---|
| Original language | German |
| Pages (from-to) | 68-71 |
| Number of pages | 4 |
| Journal | WasserWirtschaft |
| Volume | 103 |
| Issue number | 5 |
| DOIs | |
| State | Published - 2013 |
| Externally published | Yes |