Ten companies have applied to prequalify for a consultancy contract on the multi-million dollar Wadi Dayqah dam and water supply project in Oman.

The consultant will be responsible for design and supervision. On completion, the dam will deliver 35 million cu m a day (cm/d) of water – 19.3 million cm/d to Muscat, 10 million cm/d to the Wadi Dayqah area and 5.7 million cm/d to Quriyat.
The companies include: Beirut-based Dar Al-Handasah (Shair & Partners); Electrowatt Engineering Services (Switzerland); local Arab Bureau for Designs & Technical Consultations; Khatib & Alami (Lebanon), MWH (New Zealand); Black & Veatch (UK); Parsons International (US); Renardet Ingenieurs International (France); Temelsu International Engineering Services (Turkey); and Environmental-Civil Engineering & Consulting (India).
Oman plans to build a dam across the Wadi Dhayqah and harness its abundant water capacity to supply areas of Muscat Governorate.
The dam project and associated water supply scheme is the biggest of its kind envisaged in recent years by the Ministry of Regional Municipalities, Environment and Water Resources.
Wadi Dhayqah links the Wilayat of Dima wa’Tayeen in the Sharqiyah region with Quriyat in Muscat Governorate, before reaching the sea at Daghmar. It is also one of the largest perennial streams on the Arabian peninsula, with a year-round flow fed by a catchment area encompassing some 1,900 sq km, which is the largest in the Sultanate.
The dam will be constructed near the village of Al Mazara in the Wilayat of Quriyat, some 60 km southeast of the capital Muscat.
A hydro-technical study prepared by the Ministry envisions a dam structure with a reservoir storage capacity of 100 million cu m. The dam has been sized to provide the maximum yield from the reservoir. A series of outlets and pipelines will channel water from the reservoir to a treatment plant, which will be located about three km from the dam somewhere along the road from Al Mazara.
The plant, with a proposed capacity of 105 million litres/day, will be equipped to eliminate hardness, turbidity and metals from the water, while also disinfecting supplies from micro-organisms.