In
Brief:
| The City of High Point, NC built and operates five regional water quality control structures to control nonpoint source pollutant loads entering their two water supply reservoirs: City Lake and Oak Hollow Reservoir. This report presents results from a monitoring study designed to evaluate the pollutant removal efficiency of the Regency Pond-Wetland, Mall Pond A, and Mall Pond B. Mall Ponds A and B are large regional wet detention ponds that generally comply with the design standards of the N.C. Department of Environment and Natural Resources (NCDENR)' for wet detention ponds (NCDEHNR 1995). Pond A has three major tributaries that receive runoff from a mixture of medium and high-density residential, commercial, and institutional land uses originally developed in the 1960s and 1970s. Mall Pond B receives runoff from: (1) a large recently completed shopping mall; and (2) an older area containing a mixture of commercial, institutional, and residential land uses. The Regency Pond-Wetland System treats runoff from a very large watershed containing a mixture of forest, open space, single-family residential land uses, and the Piedmont Triad International Airport. The pond-wetland system consists of two parts-an upper pond and lower wetland. The upper pond has a small permanent pool to remove coarse-grained sediment and a large temporary pool to reduce peak flows entering the lower wetland. Because of restrictions placed on alteration of natural wetlands at the site, the pond-wetland system is significantly undersized in comparison to NCDENR design standards. |
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