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The Hashemite Kingdom of Jordan 

AI-Wehdah Dam

 

Loan No.: 394 Interest Rate: 4.5 %
Beneficiary: Jordan Valley Authority Grace Period: 6 years
Project Cost: KD 65.1 million Maturity: 22 years
Amount of Loan: KD 35.0 million Repayment: 33 semi-annual installments
Date of Loan Agreement: 16/05/2000 First Installment: 6 years following the first disbursement
Date of Effectiveness: 10/06/2000    

 

Objectives:

The project aims at storing and regulating the floods in the Yarmouk river to increase water utilization from this river by an additional quantity of 105 million m3 of water annually. The project will supply 50 million m3/year for municipal uses in the Greater Amman area and 55 million m3/year for irrigation in the Jordan Valley. and will improve health and living conditions, increase agricultural production, improve farmers' income and generate new employment opportunities.

Description:

The project, which is expected to be completed by the beginning of the year 2004, includes the construction of Al Wehdah Dam on the Yarmouk river at the Maqarin site. The dam is a concrete face rockfill dam and will impound a reservoir with gross storage capacity of 225 million m3. The project includes site preparation, civil and electromechanical works, the construction of a powerhouse and the supply of its equipment, in addition to the engineering services, land acquisition and project implementation management. The project consists of the following main components:

1- Dam: This includes the construction of a loom high concrete face rockfill dam which can be raised in the future up to 140m. The dam is expected to be 600 m long, 10 m wide at the crest and 400 m wide at the base.

2- Diversion Tunnel: The concrete- lined tunnel was constructed in 1989. The tunnel is 950 m in length and 7.75 m in diameter.

3- Spillway: The spillway with its reinforced concrete structure and chute will be controlled by three 12 m wide and 15 m high steel gates.

4- Irrigation intake and conduit: The intake consists of a mass concrete monolith connected to a steel penstock 3.0 m in diameter and 610 m long, encased in concrete.

5- Power intake and conduit: The intake consists of a mass concrete monolith connected to a steel conduit 3.0 ill in diameter being 580 ill long, encased in concrete.

6- Powerhouse: The powerhouse will be a conventional reinforced concrete structure and two horizontal shaft Francis-type turbines, with an installed capacity of 8 MW.

7- Cofferdams: The upstream cofferdam will be 30 ill high, 280 ill long and the downstream cofferdam will be 5 ill high and 200 ill long.

8- Grouting tunnel and curtain: The tunnel will have a diameter of 3.0 ill and will be 990 ill long from which a 1400 ill grout curtain will be constructed.

9- Drainage gallery and curtain: The curtain consists of 1800 ill of drain holes.

10- Consulting services: These include the provision of the necessary consulting services to review the project designs and tender documents, and to perform the required supervision during project implementation.

Financing:

The Arab Fund loan covers about 54% of the total project cost. It is expected that the Islamic Development Bank will contribute with a loan of KD 13.5 million and the Abu Dhabi Development Bank with a loan of KD 3.0 million. The Jordanian GOVernment will finance the remaining costs.

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