Situated just outside Ilorin , Kwara State capital city, Asa River Dam was constructed by Julius Berger Nigeria PLC in order to increase the supply of potable water by approximately 50,000 cubic metres per day, to the towns within the state. Asa River Dam consists of three sections: (1). a 400m long earth fill dam, (2). a 150m long concrete gravity dam and (3) a lateral earth dam with a length of 160m. The earth fill dam at 26m high above the bottom of the Asa River and has a width of 150m at the dam foot and of 5m at the crest. The concrete gravity dam is 20m high and has a width of 12m at the foot and of 3m at the crest. The lateral earth dam is 6m high and 23m wide at the foot. Considering the size of the Asa river’s catchment area, the 60 meter wide spillway was designed for a volume of 1,300 cubic metres per second. A 65m long weir bridge was built over the spillway. During the design phase, Julius Berger Nigeria PLC proposed to raise the he...
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