- Chabrouh Dam
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The Chabrouh Dam is a dam in Lebanon, 40 kilometers northeast of Beirut and was inaugurated in 2007. The dam has a height of 63 metres. The reservoir has a capacity of some 8 million cubic meters and is some 1300 metres in length.
The dam is located in rural Lebanon and is surrounded by farmland. Agricultural lands stretch far below the Chabrouh Dam and the water is used from the reservoir to irrigate the lands, providing an essential resource to thousands of people in the villages below.
CHABROUH dam is located on Oued Chabrouh river, about 40 km North-East of Beirut. This project will provide potable water during the summer period for Kesrouan region (around 250,000 inhabitants). The dam is a bituminous face rockfill dam (BFRD), with maximum height of 65m, crest length of 470m at 1618m above sea level and a volume of rockfill of 1,500,000m3. The upstream and downstream slopes are 1V:1.7H. The upstream bituminous slab has a total area of 37,000m2 and total thickness of 22 cm (2 layers of 6 cm and a base one of 10 cm). The embankment is divided into 8 zones of materials as well as filters and drains. The rockfill for the embankment is selected from two quarries at about 5 km from the dam site. Zone I (1800–1860) is a mixture of hard limestone (above 1840) and chalky limestone (Average Los Angeles 50) used for embankment material 3B and 3BE (see figure 2.2). Zone II is a formation of very hard limestone (Average Los Angeles 25) used for concrete aggregates and materials 2A, 2B, 3A, 4 and draining systems (see figure 2.3). The test layers performed with fill material 3B, showed that after compaction, the percentage of fines was greater than expected with Kh/Kv =100. These results led to the implementation of a draining chimney located at 45 m from the upstream face of the embankment, aiming at controlling all potential leakages, and channelling the water towards the horizontal drains of the embankment. The construction of the dam was done in phases taking into consideration the fact that the site was covered with snow during at least 4 months of the year. The deviation of the water course was delayed in order to finish the deviation tunnel. Meanwhile, the works were taking place on the left and right banks separately
Contents
Description
The project consists of the construction of the three following elements:
The dam (lot 1)
The site is located 40 km North-East of Beirut.Chabrouh is a face concrete rockfill dam having the following specifications:
- Storage capacity : 9 Mm³
- Crest level : 1618 m
- Crest length : 470 m
- Crest width : 10 m
- Maximum height : 63 m
- Maximum width : 200 m
- Upstream slope : 1.7/1
- Downstream slope : 1.7/1
- High water level : 1615
- Rockfill volume : 1,550,000 m³
- Total volume of excavation in open air : 710 000 m³
- Total volume of underground excavation : 28 000 m³
- Concrete face area : 30,750 m²
- Concrete face thickness : 40 cm
- Undergroud concrete : 12 400 m³
- Shotcrete : 3 000 m³
- Total grouting holes length : 60,000 m ( maximum hole depth is 90m)
- Total length of drainage gallery : 500 m
The floodwater structure consists of
A well of 11.2m of diameter and 50 m of height arising at 1615m A tunnel of 4.5m of diameter and 410m of length ending by a spillway.
The Outlet structure consists of A well of 7.20m of diameter and 50 m of height arising at 1618m D shape tunnel of 3m of height and 145m of length An adduction line of 800mm of diameter and 480m of length with 4 batterfly valves DN 700
Adduction line (lot 2)
It consists of 5190m of pipes of 1000mm of diameter from Nabaa El Laban to Chabrouh reservoir. It passes through a well of 2.7m of diameter and 60m of height, and a tunnel of 660m of length ( D shape 3m of height).
Water treatment plant (lot 3)
It consists of a drinking water treatment plant of 60,000 m³/day of capacity including water aeration system, treatment chain, treated water reservoir and administrative buildings.
External links
Categories:- Dams in Lebanon
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