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Naga Hammadi Bridge

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Construction of the new Naga Hammadi barrage was completed in the spring of 2008. The 330m long dam at Naga Hammadi in Upper Egypt replaces a structure built in the early 1900s. Acting as a weir, the seven-gate dam raises the water levels up to 8m for irrigation and drives a 64MW hydroelectric plant.

The barrage is of crucial importance to the development of the Nile Valley water supply infrastructure.
Naga Hammadi dam and hydroelectric plant location

The old Naga Hammadi barrage, the middle of three such structures constructed between 1900 and 1930 along the Nile River in Upper Egypt, is located 140km north of the city of Luxor and 360km downstream of the Aswan Dam, which was completed in 1963. This reservoir feeds an agricultural irrigation system, thus securing year-round cropping of 320,000ha.

The new Naga Hammadi barrage is located some 3,500m downstream of the existing structure in a confined reach of the river where geological conditions facilitated the establishment of a large construction pit in the river with a depth of 25m below river water level.
Naga Hammadi barrage construction

A conceptual study comparing rehabilitation of the existing barrage at Naga Hammadi and construction of a new one concluded that a new structure should be built along with a hydropower plant. This was considered the most economic alternative. The construction work on the new barrage project started in 2002.
The diversion canal allowed the barrage to be built in the dry, with foundations up to 25m below the normal river level. Acting as a weir, the seven-gate dam raises water by 4m to 8m for irrigation and drives the 64MW hydroelectric plant.

The new barrage is a 320m-long concrete structure erected in a single construction pit spanning the entire width of the river. Foundation levels lie up to 25m below the water level. During construction, the Nile River was diverted past the construction pit through a 1,100m long canal.

The project required an estimated seven million cubic metres of soil to be moved, as well as around 40,000t of steel and a concrete pour of about 380,000m³.

Works included a 66m-high headpond, a 170m-long navigation lock with a width of 17m and a 330m-long low level public road bridge of over the dam.

Groundwater seepage into the huge construction pit was cut off by a 60m-deep concrete diaphragm wall enclosing the pit.

Fully operational since Spring 2008, the project is a central feature in the water infrastructure of the Nile Valley.

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