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WRRCSR No.10:18:91 Impoundment of Stream Flow in West Loch, Pearl Harbor, Oahu, Hawaii: A Feasibility Study

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Title: WRRCSR No.10:18:91 Impoundment of Stream Flow in West Loch, Pearl Harbor, Oahu, Hawaii: A Feasibility Study
Authors: Fok, Yu-Si
Murabayashi, Edwin T.
Keywords: impoundment
flood-control storage
reservoirs
stream flow
water supply development
show 12 moredams
dam sites
concrete dams
flexible membrane structures
fabridams
Waikele Stream
Waikele Springs
Honouliuli Stream
West Loch
Pearl Harbor
Oahu
Hawaii

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LC Subject Headings: Dams -- Hawaii -- Oahu.
Membranes (Technology).
Pearl Harbor (Hawaii)
Water -- Storage -- Hawaii -- Oahu.
Issue Date: Sep 1992
Publisher: Water Resources Research Center, University of Hawaii at Manoa
Citation: Fok YS, Murabayashi ET. 1992. Impoundment of stream flow in West Loch, Pearl Harbor, Oahu, Hawaii: a feasibility study. Honolulu (HI): Water Resources Research Center, University of Hawaii at Manoa. WRRC special report, 10:18:91.
Series/Report no.: WRRC Special Reports
10:18:91
Abstract: This study investigated the feasibility of capturing and storing fresh stream water flowing into West Loch, an estuarine, enclosed inland embayment of Pearl Harbor, Oahu, Hawaii, that is accessible to the sea
through a narrow channel. The concept is to create a sea-level reservoir in the loch by, in some manner, displacing the salt water with fresh water. Three possible methods for accomplishing this were examined. The first two involved damming the embayment at a desired point on the seaward side by using a
conventional impermeable core earth dam or a fabridam or rubber dam, for which their technology is well developed and operational. The third method involved using a flexible impermeable membrane structure
to separate the fresh water from the salt water. Thus, the salt water is displaced by the freshwater-filled container without a rigid barrier. This membrane technology is insufficiently developed to use operationally at this time. Six alternative dam sites having reservoirs of varying capacities were examined and analyzed as possible locations for the enclosure. The farthest downstream site has the largest storage capacity not only because of the reservoir's larger surface area, but also because the bottom becomes progressively shallower upstream. Major conclusions were (1) no dam site has a clear advantage because
the sites storing the most water are the deeper areas used by the Navy, while the smaller shallower sites cannot store significant amounts, (2) there is sufficient stream inflow to annually fill even the largest reservoir, and (3) environmentally, considerable impact will occur within the reservoir as salinity decreases to freshwater levels.
Sponsor: Division of Water and Land Development Department of Land and Natural Resources State of Hawaii Grant/Contract No. L100 19234
Pages/Duration: xiv + 165 pages
URI/DOI: http://hdl.handle.net/10125/8774
Appears in Collections:WRRC Special Reports



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