Basins

City of Charleston Drainage Basins Quantity = YES, means the basin is an area of known flooding - a special protection area for water quantity Quality = YES, means runoff discharges to TMDL (total maximum daily load (pollutants)) impaired waters – a special protection area for water quality CCBasin = YES, basin is in Church Creek Basin – there are extra requirements here查尔斯顿市（City of Charleston）排水流域相关判定规则为：水量（Quantity）字段取值为"是"时，该流域为已知洪涝区域，属于水量保护特殊区域；水质（Quality）字段取值为"是"时，该流域的径流排入总最大日负荷（TMDL，total maximum daily load）污染受损水体，属于水质保护特殊区域；CCBasin字段取值为"是"时，该流域隶属于教会溪流域（Church Creek Basin），该区域存在额外管控要求。