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The purpose of this project is to provide safe navigation for existing and prospective vessel traffic by establishing and maintaining a safe navigation channel from the 12-foot contour in the open ocean to the village of Murrells Inlet, and constructing a turning basin and jetties. This final environmental impact statement presents the recommended plan of improvement consisting of the following: dredging an entrance channel, 300 feet wide and 10 feet deep through the offshore bar, a distance of approximately 3,000 feet; dredging an inner channel, 200 feet wide and 10 feet deep for a distance of 1,850 feet then, 90 feet wide and 8 feet deep to the major berthing area at old Army crash boat dock, a distance of 13,590 feet where it would terminate in a turning basin 300 feet long and 150 feet wide; dredging a deposition basin 18 feet deep adjacent to the weir section of the north jetty; constructing a north jetty 3,455 feet long with a low weir section for sand bypassing; constructing a south jetty 3,330 feet long; constructing a fishing walkway on top of the south jetty; and constructing sand dikes on both sides of the inlet to tie the jetties to the existing dune line. Additional keywords: Army Corps of Engineers; South Carolina.
This supplement presents modifications of the channels, jetties and weir system that were previously submitted for approval. The major revisions occurred as a result of model test data developed by WES subsequent to submission of the GDM. Other changes were made as a result of a conference held at SAD on 20 August 1976 concerning design of weir jetty structures. This supplement covers changes in jetty and channel configuration resulting from model testing of Plans 7A, 7B, Plans 1B through 1H and from innovative changes in weir system design. It also presents a summary of the WES model results for all plans tested. A comprehensive report of the model testing program for the Murrells Inlet Navigation Project will be submitted as a separate appendix (to the General Design Memorandum) at a latter date. A revised project cost estimate considering the various changes is presented. A physical model of Murrells Inlet and estuary was constructed at WES to evaluate the effects of currents and wave action on different arrangements of the jetty system under simulated prototype conditions. This fixed bed model was constructed to 1:200 horizontal and 1:60 vertical scales.