Johns Island, Charleston County, South Carolina Preliminary Reconnaissance Report,
CORPS OF ENGINEERS CHARLESTON SC CHARLESTON DISTRICT
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The topography of the island is generally flat with elevations ranging from 5 to 25 feet above mean sea level. Abbapoola, Bohicket, and Simons Creeks furnish the principal drainage outlets for the island. The capacities of existing outlets are entirely inadequate due to silting and accumulation of debris and vegetation in the channels. The proposed plan of improvement for Johns Island consist of enlargement and realignment of the existing channels. The total length of channels is paproximately 70 miles and consists of 19 individual systems. This type drainage plan is necessary because of the random type drainage pattern on the island which was brought about by the forming of various beach lines as the sea reded in recent geological times. The fact that both uraban and agricultural areas are affected was taken into the consideration when selecting design criteria. Design depth of channels would permit discharge into tidal creeks at mean low water elevation in order to provide added channel depth and grade.
- Civil Engineering