Low Impact Development (LID) refers to a set of stormwater management approaches that are implemented to reduce runoff and pollutant loadings as close to their source(s) as possible. Through these approaches, permanent water quality can be micromanaged at various locations around the site in lieu of larger BMPs near the outfall of the drainage area.
There are a few additional design considerations that will need to be taken into account when preparing a Stormwater Pollution Prevention Plan for Residential Subdivisions, particularly those developing subdivisions.
Amount of Disturbance = 2[Max Restricted Building Size][Number of Lots] + Right of Way Areas
*Max Restricted Building Size = Maximum
Disturbed Area per Lot (Acres)
By definition an MS4 is a system of conveyances that include, but are not limited to, catch basins, curbs, gutters, ditches, man-made channels, pipes, tunnels, and/or storm drains that discharge into Waters of the State. For these conveyances or system of conveyances to be recognized as an MS4, a state, city, town, village, or other public entity must own them. These conveyances must also not be part of a Publicly Owned Treatment Works and may not operate as a combined sewer.
The control of sedimentation from construction sites is accomplished through the utilization of a variety of erosion and sediment control Best Management Practices (BMPs). Essentially, any device, practice, or procedure that has demonstrated to effectively control either the quality and/or quantity of stormwater runoff while maintaining compatibility with the planned land used are classified as BMPs.
The South Carolina Pollution Control Act defines Waters of the State (WoS) as: lakes, bays, sounds, ponds, impounding reservoirs, springs, wells, rivers, streams, creeks, estuaries, marshes, inlets, canals, the Atlantic Ocean within the territorial limits of the State and all other bodies of surface or underground water, natural or artificial, public or private, inland or coastal, fresh or salt, which are wholly or partially within or bordering the State or within its jurisdiction."
From Urban Runoff Handbook (EPA, 1993)
A Stormwater Pollution Prevention Plan (SWPPP) is a site-specific document or collection of documents that identifies the potential sources of stormwater pollution, describes stormwater control measures, such as BMPs, to reduce or eliminate the identified pollutants, and that also identifies procedures operators will implement to comply with specific permit conditions. A SWPPP can be provided for a number of circumstances, but the most common is to address stormwater pollutants during construction activities and during the operation of industrial activities.
The provided Stormwater Links below have been separated into three categories, Construction, Industrial, and MS4s, based on to which general permit the link most relates to.
The links to non-DHEC organizations below are provided solely as a service. The links do not constitute an endorsement of these organizations or their programs. DHEC is not responsible for the content of the individual organization web pages found at these links.
