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SCM Design and Implementation

The NC DEQ Stormwater Design Manual provides detailed design and implementation guidance on the Minimum Design Criteria (MDC) for stormwater control measures (SCM).  The NC Stormwater Credit Document provides an overview and comparison of SCM performance for key stormwater management parameters like total suspended solids, total nitrogen, total phosphorous, and runoff volume match.

Minimum Design Criteria: the requirements set forth in state stormwater rules for SCM siting, site preparation, design and construction, and post-construction monitoring and evaluation in order to comply with State water quality standards.


Excerpt of potential SCM siting constraints (NC DEQ Stormwater Design Manual).



TRAINING AVAILABLE: NCSU & NC DEQ are partnering to offer 1.5 day “Welcome to the MDC” workshops throughout the state. The workshop provides 12 PDHs for engineers and surveyors.


SCM Inspection and Maintenance

SCMs are water quality treatment devices and require regular inspection and maintenance to function properly. Most jurisdictions require annual SCM inspection and maintenance, and require inspections to be carried out by a registered North Carolina professional engineer, surveyor, or landscape architect. Many companies specialize in SCM inspection and maintenance, and NCSU maintains a list of certified professionals.



TRAINING AVAILABLE: NCSU offers Stormwater BMP* Inspection & Maintenance Certification Workshops.  *BMP is the previous term for SCM.


The NC DEQ Stormwater Design Manual also addresses many logistical aspects of SCM operations and maintenance.


Overview of the operations and maintenance topics covered in the NC DEQ Stormwater Design Manual.


Recommended inspection frequency for selected SCMs (NC DEQ Stormwater Design Manual). Although jurisdictions may only require annual inspections, more frequent inspections of vegetated systems can ensure early detection of problems so they are less costly to correct.