Sustainability Of Hydropower Reservoir As Flood Mitigation Control: Lesson Learned From Ringlet Reservoir, Cameron Highlands, Malaysia

Lariyah Mohd Sidek, IR JANSEN LUIS

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Abstract

Dams and reservoirs are constructed primarily to function as multipurpose functions
including as flood control, drinking water, agricultural water supply, hydro power
generation, recreation and others. Annual sediment inflow estimates used during the
reservoir design stage are most often exceeded half way through the life span due
development and poor catchment management. The biggest challenge that is faced
with the sustainability of the hydro plants is to cope with reservoir sedimentation and
loss of storage.
The paper discusses the reservoir storage loss due to sedimentation at Ringlet
Reservoir in Cameron Highlands, where the long term annual capacity loss or
sedimentation rate of Ringlet Reservoir in 1965 was estimated at 25,000m3/yr which
has increased to an average of almost 6 fold to 139,712m3/yr in 2008 and is
increasing by the year. Due to rapid reservoir sedimentation since construction, it is
estimated that the existing live storage has been reduced to 2.3 million m3 or 50%.
With the reduced storage capacity in the reservoir it is expected that more frequent
operation of the gates for control spilling will occur where the downstream population
is at higher risk. Field inspection revealed that downstream encroachment into the
river reserve by horticulturalists has increased. With the increasing loss of storage in
the reservoir due to sedimentation the flood mitigation measures are very crucial. The
paper highlights the structural and non-structural measures that have been identified
and are being implemented at different stages to mitigate the risk of flooding
downstream.
Original languageEnglish
Publication statusPublished - 22 Aug 2014

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All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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