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SC Coastal (B-C-D)

The SC Coastal Watershed is contained within both the Cooper River Basin and the Ashley River Basin.

The Cooper River Basin encompasses 8 watersheds and 843 square miles. The Cooper River Basin incorporates the Lower Coastal Plain and Coastal Zone regions. Of the half million acres in the Cooper River Basin, 8.3% is urban land, 2.6% is agricultural land, 4.1% is scrub/shrub land, 0.4% is barren land, 52.7% is forested land, 14.5% is forested wetland, 1.6% is nonforested wetland, and 15.8% is water. The urban land is comprised chiefly of the greater City of Charleston area. There are a total of 471.2 stream miles in the Cooper River Basin, together with 60,188.5 acres of lake waters and 13,059.3 acres of estuarine areas. The diverted Santee River flows through Lake Moultrie's Pinopolis Dam and joins Wadboo Creek to form the Cooper River. The Cooper River merges with Mepkin Creek to form the West Branch Cooper River, which then converges with the East Branch Cooper River to reform the Cooper River. The Cooper River then accepts drainage from the Back River, Goose Creek, and the Wando River before flowing into the Charleston Harbor and the Atlantic Ocean.

The Ashley River Basin incorporates 7 watersheds and 894 square miles. The Ashley River Basin consists of the Lower Coastal Plain and Coastal Zone regions of the State, and of the half million acres in the basin, 9.8% is urban land, 4.1% is agricultural land, 7.2% is scrub/shrub land, 0.2% is barren land, 47.6% is forested land, 7.8% is forested wetland, 15.1% is nonforested wetland, and 9.0% is water. The urban land is comprised chiefly of the greater City of Charleston area. There are a total of 239.6 stream miles in the Ashley River Basin, together with 4232.0 acres of lake waters, and 32,701.9 acres of estuarine areas. The Cypress Swamp drains into the Great Cypress Swamp, which joins with Hurricane Branch to form the Ashley River. The Ashley River accepts drainage from several streams including Dorchester Creek, and communicates with the Stono River by way of Elliot Cut before draining into the Charleston Harbor and the Atlantic Ocean. The Charleston Harbor also accepts drainage from a portion of the Atlantic Intracoastal Waterway (AIWW).*

*http://www.scdhec.net/eqc/water/shed/home.html

*Information adapted from the South Carolina Department of Health and Environmental Control (S.C. DHEC) website.

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