Morrisville, North Carolina
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Construction Site Stormwater Runoff Controls
The primary goal of the construction site runoff control program is to reduce pollutants in stormwater runoff from construction activities disturbing one or more acres of land surface and those activities less than one acre that are part of a larger common plan of development. Additional objectives include providing procedures for public input, sanctions to ensure compliance, requirements for construction site operators to implement appropriate erosion and sediment control practices, review of site plans which incorporates consideration of potential water quality impacts, and procedures for site inspection and enforcement of control measures. Finally, the Town must establish requirements for construction site operators to control waste such as discarded building materials, concrete truck washout, chemicals, litter, and sanitary waste at the construction site that may cause adverse impacts to water quality.

The Town of Morrisville relies on the Wake County Sediment and Erosion Control program to comply with this MCM. Additionally, the Town of Morrisville conducts random inspections of local land disturbing activities that have a sediment and erosion permit issued by Wake County, to see if the site is in compliance. The Town also monitors the Wake County program for effectiveness in the permittee jurisdiction. Finally, potential problems at construction sites with sediment and erosion control permits are reported to Wake County and any follow-up actions are monitored and documented. Potential sediment and erosion control violations should be reported to the Town via the Stormwater Hotline (919-463-S0AK [7025]) or through the online reporting system.  The report can also be made directly to Wake County Erosion Control staff.

Post-Construction Stormwater Management

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

Storm Drainage System Inventory Map
Please click the map to view the Town's storm drainage system inventory map.
storm drain map inventory

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 area for single family projects (1/2 ac. for others), 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 Engineering Design and Construction Manual. 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
NCDEQ Stormwater Design Manual. Additionally, the Town requires annual operation and maintenance (O&M) reports for each BMP and is implementing long term O&M by legal documentation and maintenance security funds.

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: 

Disconnected Impervious Surfaces
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 Annual Reporting Instructions

The Town now performs annual inspections of all BMPs as a service provided under the Town's stormwater utility fee (more information).  If an owner chooses to also do their own, complete reports must include the   forms and information below.  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.  Additionally, stormwater BMPs must be periodically inspected per the frequency specified in the recorded operation and maintenance agreement for the facilities. 

  • 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: Stormwater Staff

 Other Forms, Tools & Links

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