Morrisville, North Carolina
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Post-Construction Stormwater Management

Ordinances/Manuals
Please visit the Town's Unified Development Ordinance Page for our updated Ordinances and Manuals.


The purpose of the post-construction stormwater management program is to manage stormwater runoff from new development/redevelopment that drains to the MS4 and disturbs an acre or more of land surface, including projects less than an acre that are part of a larger common plan of development or sale. The program also is required to provide a mechanism to ensure long-term operation and maintenance of BMPs and that controls are in place to minimize water quality impacts.

The Town adopted and approved a post-construction stormwater management ordinance, included in the Design and Construction Ordinance, on November 26, 2007. The Town enforces and implements the requirements of the ordinance for post-construction stormwater management and only allows the use of stormwater quality BMPs designed in accordance with the NCDENR Stormwater Best Management Practices Manual. Additionally, the Town requires annual operation and maintenance (O&M) reports from BMP owners and is implementing long term O&M by legal documentation and the posting of security bonds.

Structural Stormwater BMP Operation and Maintenance (O&M)
Stormwater O&M Agreements
Prior to the conveyance or transfer of any lot or building site or issuance of any development permit for a development to be served by a structural BMP required by the Design and Construction Ordinance, developers are required to execute and record operation and maintenance agreements to ensure that owners maintain and operate the BMP facility to preserve and continue its function for which it was originally designed.  Operation and maintenance agreements require BMP owners to properly maintain, repair and, if necessary, reconstruct the BMP and provide a schedule for the maintenance frequency for the facility.  Operation and maintenance agreements must be recorded with the Wake County register of Deeds upon final plat approval and recorded copies must be submitted to the Town within fourteen days following recordation.  Town of Morrisville structural stormwater BMP operation and maintenance agreement documents are provided below:

Bioretention  
Dry Extended Detention Basin 
Filter Strip, Restored Riparian Buffer and Level Spreader 
Grassed Swale 
Infiltration Basin 
Infiltration Trench
Permeable Pavement 

Rainwater Harvesting
Rooftop Runoff Management 
Sand Filter 
Stormwater Wetland 
Underground Detention System 
Wet Detention Basin


Stormwater O&M Inspection Reports
The Town of Morrisville National Pollution Discharge Elimination System Phase II (NPDES Phase II) Stormwater Permit requires that structural BMPs be inspected annually to preserve and continue their function in controlling stormwater runoff quality and quantity at the degree or amount of function for which the structural BMP was designed.  Operation and maintenance inspection reports must be submitted for all structural BMPs one year from the date of final as-built certification for the stormwater facility on an annual basis.  Additionally, stormwater BMPs must be periodically inspected per the frequency specified in the recorded operation and maintenance agreement for the facilities.  Town of Morrisville stormwater BMP inspection reports are available below:

Annual Inspecton Cover 
Bioretention 
Dry Extended Detention Basin 
Filter Strip, Restored Riparian Buffer and Level Spreader 
Grassed Swale 
Infiltration Basin 
Infiltration Trench

Permeable Pavement 
Rainwater Harvesting 
Rooftop Runoff Management
Sand Filter
Stormwater Wetland 
Underground Detention System
Wet Detention Basin 


Stormwater O&M Reporting Instructions

Complete reports must include the following information:

  • Structural BMP Annual Operation and Maintenance Inspection Cover Sheet - The inspection report must be submitted and sealed by a qualified registered North Carolina engineer, surveyor or landscape architect performing services only in their area of competence.
  • Appropriate individual structural BMP report form(s) for all BMPs located on the property -  In addition to the individual report(s) for the date of the official annual inspection, individual BMP inspection reports must also be provided for the periodic inspections required as part of the stormwater operation and maintenance agreement. 

All annual inspection reports should be mailed or emailed to the following location:

Stormwater Administrator
Town of Morrisville
Engineering Department
P.O. Box 166
Morrisville, NC 27560 

email: Robert Patterson

 Stormwater As-Builts
 Other Hepful Info & Links


    


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