2009 saw the completion of the Wadi Dayqah Dam in
Oman. With very few significant dam sites, Wadi
Dayqah Dam is not only the largest dam yet to be
constructed, but the largest ever likely to be built
in the country. The dam comprises a 77 m high RCC
structure, over which the spillway is routed, and a
40m high rockfill saddle embankment. The 600 000 m3
of concrete comprising the RCC dam was placed
between January 2008 and May 2009, with the bulk of
the dam body completed by December 2008. Due to the
high temperatures to which the site is exposed, RCC
placement was generally undertaken at night.
Despite being hit by a flood with a recurrence
interval in excess of 10 000 years, just 1 year
after construction was initiated, the project was
completed on schedule, allowing impoundment to
commence in August 2009.
The design team comprised Black and Veatch of the
UK, Su-Yapi of Turkey and Nespak of Pakistan, with
ARQ filling the role of RCC Specialists and
providing design assistance for the dam structure
and the spillway.
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