Post-Construction Stormwater Management

Why is The Control of Post-Construction Runoff Necessary? 

Areas undergoing development have been shown to significantly affect receiving water bodies. Post-construction runoff can lead to an increase in the type and quantity of pollutants in stormwater runoff. When stormwater flows over developed areas, it can pick up pollutants such grease, pesticides, heavy metals, sediments, and nutrients. The pollutants enter the food chain through small aquatic life, and can eventually enter the tissues of fish and humans. Post-construction runoff can also lead to an increase in the amount of water delivered to a water body, which can cause flooding and stream bank scouring. 

For those reasons, the Town of Harrisburg monitors post-construction runoff for water QUALITY and water QUANTITY. 

Stormwater Best Management Practices (BMP)

There are many examples of structural and non-structural BMPs that can be utilized by developers. Please see the Town of Harrisburg Stormwater Drainage Manual for acceptable BMPs.

Annual Inspections

BMPs are required to be inspected annually, and reports are due by November 30 of the calendar year. When a new development meets the requirements set forth by the Unified Development Ordinance for meeting water quality and water quantity standards, the developer is required to construct a storm water control measure. Prior to acceptance of the development, whether commercial or residential, the developer must enter an Operation and Maintenance Agreement with the Town. The Agreement binds the developer or owner to lifetime maintenance of the stormwater control measure. 

Maintenance and reporting checklists can be found in the Stormwater Drainage Manual

Any questions regarding annual inspections should be sent to Mallory Hodgson at mhodgson@harrisburgnc.org