Rehabilitation Of Trash Screen At Jor Reservoir Low Level Outlet


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Jor reservoir was constructed to assure flow regulation for the Woh hydroelectric
power station, as well as to provide storage for flood control. The reservoir outlet is frequently
operated once every three months to flush the deposited sediments accumulated within the
reservoir. Preliminary testing and inspection on the reservoir outlet revealed that the trash
screen located at upstream of reservoir outlet had been damaged and dislodged creating a large
opening at the trash screen thus permitting entry of larger logs which blocks the passage of
water through the reservoir outlet. Bathymetric survey showed the total height of sediment
deposition above the reservoir outlet covering the trash screen was estimated at approximately
13 m. The sediment volume estimated to be cleared from above the reservoir outlet area is
15,000 m3
. Soil investigation conducted shows that the sediments deposited within the reservoir
exhibits various different profile and characteristics. The average sediment distribution at
deeper depths closer to the trash screen was found to be of 27% clay, 26% silt, 43% sand and
4% gravel. The rehabilitation works on structure as the low level outlet serves as an important
feature for reservoir sedimentation management as well as for safe flood discharge release as
designed for the dam. It is important that the function of the reservoir outlet structure is
maintained in accordance to the International Dam Safety Standards.
Original languageEnglish
Publication statusAccepted/In press - 22 Aug 2014

All Science Journal Classification (ASJC) codes

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

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  • Cite this

    Mohd Sidek, L., LUIS, IR. JANSEN., & JULIEN, PIERRE. Y. (Accepted/In press). Rehabilitation Of Trash Screen At Jor Reservoir Low Level Outlet.