Muda dam
Side buttresses of Muda dam
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The Pedu valley contributes rela- tively small additional inflow, but pro-
vides over 700,000 acre feet, or 90 per
cent of the total storage. The reservoir is formed by the Pedu rockfill dam, 200 ft. high, which has an imperme- able upstream membrane of asphalt. Only a 6in. thickness of asphalt is used, placed in three layers, the top layer being toughened with the addition of 0.80 per cent asbestos fibre.
A saddle in the rim of the reservoir is closed by an earthfill embankment 70 ft. high.
Barrages
Water for irrigation is released through Pedu dam by two culverts, each having an all-welded steel lining with reinforced concrete surround. Butterfly guard valves and hollow jet control valves on each culvert are oil- hydraulically operated and can release 5000 cusecs of water for irrigation.
The water finds its way for some 30 miles down the natural river course to be intercepted by a barrage at Pelu- bang. The control valves are designed for remote operation from the control centre at Alor Star, 40 miles distant from the dam.
Irrigation water is directed into a network of main and secondary canals
Far East BUILDER, April 1971
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