Project Name: Detailed Design and Technical Consultancy Services for Al-Wehdah RCC Dam

Country: HASHEMITE KINGDOM OF JORDAN

Finance Source: ÖZALTIN Construction, Inc.

Tags: Jordan, Özaltın Construction Inc, HEPP, Design, Contract Management

Al-Wehdah Dam aimed for irrigation and domestic water supply, is located in the north of Jordan on the Yarmouk River which forms a natural border between Jordan and Syria. It is a Roller Compacted Concrete (RCC) type dam with crest elevation 116.00 m asl and 96 m height from foundation (El. 20.00 m). The upstream face of the dam will be vertical from the crest at El. 116.0 to the top of a heel block at El. 65.0. Below El. 65.0, an upstream slope of 0.6H:1V is applied to form the heel block. The downstream slope is uniform at 0.8H:1V from the crest at El. 116.0 to the top of foundation rock at the toe of the dam(El. 20.00 m).

The dam body consists of about 1.3 million cubic meters of RCC. A 2.0-m wide by 2.5-m high grouting and drainage gallery is provided at El. 25.0 approximately 12 m downstream of the dam heel at the maximum section transitioning to 5 m from the vertical face of the dam above El. 61.0.

The diversion during construction was made through a concrete lined modified horseshoe tunnel within the right bank (previously opened) having the length of 927 m and of 7.75 m inner diameter. The diversion tunnel and cofferdams have been designed for a discharge capacity of 650 m3/sec corresponding to 50 years flood frequency.

Ungated spillway at El. 110.0 m is located over RCC dam body having an ogee 250.00 m long followed by a stepped chute channel. It has a maximum discharge capacity of 7600 m3/s corresponding to a maximum reservoir surcharge elevation 115.90 m asl during Probable Maximum Flood (PMF). Stepped chute channel ends with a 100 m wide 46 m long stilling basin at the downstream toe of RCC dam.

An intake tower anchored to the upstream face of the dam body was constructed with 3 inlet openings at different elevations for irrigation water release and for evacuation of the reservoir in case of necessity. Water conveyance is through 2 steel penstocks, 3.0 m diameter each, embedded in RCC dam body and discharge will be controlled by a set of slide gates at the downstream end of each penstock.

The preparation of final design of the project for alternative construction methodology; detailed design and preparation of shop drawings for civil, electrical and hydromechanical works of RCC dam and appurtenant structures were completed in 03/2006. Technical consultancy and assistance for contractual management also being provided to the Client during the construction period.

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