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|Title:||Geotechnical feasibility study replacement or extension of the Craney Island Disposal Area, Norfolk, Virginia|
|Authors:||United States. Army. Corps of Engineers. Norfolk District.|
Spigolon, S. J.
Fowler, Jack, 1938-
Dredged material disposal
Craney Island Disposal Area
|Publisher:||Geotechnical Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-87-9.|
Abstract: Several alternatives were investigated to replace or extend the 2,500-acre Craney Island Disposal Area for continued dredged material disposal for the Norfolk harbor and channels. The disposal area was completed in 1957 and has been used continuously since that time and the dikes have been raised several times to the present el +26 ft Mean Low Water (MLW). Because of new plans to deepen the existing channel and continued maintenance dredging, the estimated storage life has been greatly reduced. Five alternate configurations of the extension of Craney Island to the west and/or north were investigated as to their estimated storage capacity, their effect on the hydrodynamics of the harbor and river system, and the stability and constructibility of the retaining dikes which is the subject of this report. It was determined during this investigation that it is technically feasible to design and construct the required dikes to el +8 ft MLW by hydraulic placement of sand. It was also determined that these dikes could be protected from erosion by the placement of riprap on the inside and outside slopes. The most economically feasible alternatives for storage capacity were configurations 5 and 2 which had an estimated cost per cubic yard of storage of $0.58 and $0.70, respectively.
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