Author(s): Nordin Ismail; Nik Mohd. Kamel Nik Hassan; Iwan Tan Sofian Tan
Linked Author(s):
Keywords: Live storage; Desilting; Sediment disposal; Contaminated sediments
Abstract: Ringlet Reservoir is used to regulate flow, provide storage and flood control in a hydroelectric scheme. Increased deforestation coupled with agricultural and residential development activities around the reservoir have accelerated siltation of Ringlet Reservoir. This will cause eventual loss of live storage within the next 2 to 3 years if effective countermeasures are not undertaken causing a loss of peaking capability of two power stations. The reservoir’s current deposition rate is about 300, 000 m3/year. Besides threatening the lives of people living downstream of the reservoir, dam spilling operations can cause crop damage and inundation. To overcome the problem, desilting works at Ringlet Reservoir is done using a cutter suction dredger. Dredged sediments shall be pumped to a sediment treatment area for dewatering. Placement of the dewatered sediments is then conducted at the disposal area. Operations are performed in an environmentally conducive manner. The choice of sediment transportation and disposal area was made after considering various engineering and environmental factors. Categorisation of dredged material as contaminated was done based on an internationally recognised standard. The project proponent’s prerogative in ensuring works is conducted in an environmentally responsible manner should be commended.
Year: 2005