Post-construction Stormwater Management in New Development and Redevelopment - Minimum Control Measure #5

MCM 5 is Post-construction Stormwater Management in New Development and Redevelopment. Development results in increased impervious surfaces from roads, rooftops, parking lots, and sidewalks that increases stormwater rate and volume and potentially degrades water quality in local waterways.

SMS4s must address post-construction stormwater runoff from new development and redevelopments that disturb one or more acres. This is done by requiring developments to mitigate stormwater impacts by using practices to treat, store, and infiltrate runoff onsite before it can affect water bodies downstream. This is commonly achieved by using stormwater retention ponds.


In recent years, Horry County has emphasized the use of smaller-scale low impact development practices dispersed throughout a site to achieve reduced flows and improved water quality. Long-term operation and maintenance of these practices is critical to their effectiveness, which is typically the responsibility of the property owner or property owners association. For more information, click here.