Ordinance & Administrative Rules
The Wayne County Storm Water Management Ordinance (Enrolled Ordinance No. 2006-1114A) and Administrative Rules (Resolution No. 2006-1114B) assist in compliance with the mutual requirements of the County, local government, and other public agencies under the federal Phase 2 NPDES storm water regulations. These requirements include the development, implementation, and enforcement of programs to manage storm water from new development and re-development projects. Implementation of measures for long-term management of storm water from development projects helps to minimize flooding, streambank erosion, loss of or damage to natural resources, and water quality impacts for the protection of the public health and safety. Partnerships between the County, local government, and other agencies that influence development and storm water management help ensure that the storm water management programs are effective.
The Wayne County storm water management regulations, adopted on October 19, 2000 by the Wayne County Commission, and subsequently amended in August 2003 and December 2006, consist of the following documents:
- Storm Water Management Ordinance
Provides the legal authority for the County to require that storm water management systems are implemented by development projects subject to the Wayne County storm water management regulations.
- Storm Water Management Administrative Rules
Provides quantification of the requirements to comply with the Storm Water Ordinance.
- Storm Water Management Standards Manual
Provides standards and guidance for design of different types of storm water management measures that can be used to comply with the requirements established by the Storm Water Management Administrative Rules. The Standards Manual also provides other useful information including example calculations for design of various types of storm water management measures, a listing of contacts for different types of permits necessary for construction projects, and a "plain English" explanation of the Storm Water Management Ordinance and Administrative Rules. The Standards Manual was published in October 2000, and updates have been issued August 2003, December 2006, June 2008, July 2009, October 2009, and July 2015.
Which Types of Development Projects Do the Ordinance and Rules Apply To?
The Wayne County storm water ordinance and administrative rules apply to development activities as described below:
- Residential, commercial and industrial subdivisions
- Mobile and manufactured home parks
- Projects that impact storm water runoff into or around new or existing:
- Wayne County Road rights-of-way
- County Road drainage facilities
- Storm sewer systems owned, operated or controlled by the County
- Projects that impact storm water into or around a Wayne County Drain
- Projects that impact storm water into, on, or through properties owned by Wayne County (e.g., County parks)
- Projects developed, designed or constructed by Wayne County
- Multi-unit residential development (e.g., condominium) projects that impact storm water runoff in, around, or to watersheds that are included in the County's Michigan Storm Water General Permit for municipal storm water discharges.
Persons intending to engage in these activities are required to apply for and obtain a storm water construction approval from the County prior to commencing onsite work.
What Do the Rules Generally Require for Development Projects?
Under the Wayne County Storm Water Management Program, storm water management systems must be selected and designed with two main objectives: flood control and water resources protection. Minimum performance standards that storm water management systems must achieve to meet these objectives are:
- For storm water management systems with drainage areas greater than 5 acres, the peak flow rate of storm water runoff leaving the development site must not exceed 0.15 cfs/acre for a 100-year storm.
- For storm water management systems with drainage areas of 5 acres or less, the peak flow rate of storm water runoff leaving the development site must not exceed 0.15 cfs/acre for a 10-year storm.
Water Resources Protection
- Storm water management systems must be designed and constructed to remove 80 percent or more of the total suspended solids load from the development site, as determined on an annual average basis.
Wayne County has established general design standards to be met by all storm water management systems, and specific design standards to be met by certain components of storm water management systems. These standards help ensure that each component is designed, operated and maintained such that the performance standards are met. Chapters 6, 7, and 8 of the Standards Manual provide detailed information about standards and guidance for designing storm water management system components to satisfy the performance standards.
The Wayne County Storm Water Management Ordinance and Administrative Rules were deliberately written as a performance-based program in order to provide developers with flexibility to design storm water management systems to best fit the situation at each site. Developers and designers of storm water management systems in Wayne County may select any combination of storm water management elements which meet the performance standards provided that the designer's selection: (1) complies with other requirements of the Ordinance, Administrative Rules, and Standards, (2) complies with other applicable local, state, and federal requirements, and (3) does not conflict with existing local storm water management plans. Wayne County has published our "Storm Water Management Standards" manual to provide developers/designers with information on the variety of management practices available to meet the performance standards of the Wayne County Storm Water Management Ordinance and Administrative Rules.
How are Storm Water Management Systems Maintained?
The Wayne County Ordinance and Administrative Rules require storm water management systems to be maintained in perpetuity to ensure that they function effectively as designed. A public entity, such as a local unit of government or a drainage district established under the Michigan Drain Code, must assume long-term maintenance responsibility for storm water management systems that require a Wayne County storm water construction approval. This maintenance responsibility must be assumed through a legally-binding instrument (such as an ordinance, resolution, contract, or equivalent instrument approved by the County) as a condition of final project approval.
Long-term maintenance generally begins when construction of the storm water system is complete and the storm water construction approval is released. The public entity may perform the long-term maintenance of a storm water management system itself, or it may designate another entity (such as a homeowner's association, condominium association, or property owner) to undertake this responsibility. However, even if the responsibility for maintenance activities is designated to another entity, the public entity identified in the long-term maintenance permit remains ultimately responsible for ensuring that the required maintenance is performed.
Ordinance Implementation and Additional Information
The Wayne County Storm Water Management Ordinance and Administrative Rules are implemented through the existing review and permit processes of the Permit Office of the Wayne County Department of Public Services, Engineering Division. Copies of the ordinance, rules, and standards manual are also available through the Permit Office (33809 Michigan Avenue; Wayne, MI 48184; (734) 595-6504).
- Standards ManualStandards Manual
- Each chapter and appendix of the Standards Manual is presented as a separate file. This format facilitates future revisions to the manual. Note that each page of the manual is dated. A comprehensive listing of pages revised since the February 2007 issuance of Version 3.0 of the manual is shown as the first item on this page and is entitled â€œProgram Clarifications, Errata & Revisionsâ€.
- Supplemental Information
- Other guidance materials related to the Wayne County Storm Water Management Program but not included in the Standards Manual. Materials include â€œGuideline for Wayne County Review of Manufactured Treatment Systemsâ€, â€œInformation on Delegation of Wayne County Storm Water Program to Local Communitiesâ€, and â€œInformation on how Wayne County Communities can Adopt the Wayne County Storm Water Management Ordinanceâ€. Please check this page periodically for new materials.
- Local Storm Water and Watershed Management Practices Constructed/Implemented in Southeast Michigan
- Project summaries, photos, location and contact information, web links, and other information for a variety of storm water and watershed management practices in the categories: Bioretention / Low Impact Development / Native Landscaping, Manufactured Treatment Systems and Underground Detention, Detention Ponds/Constructed Wetlands, Streambank Stabilization, Woody Debris Management, and Green Buildings.
All documents are presented in .pdf format; Adobe Acrobat Reader software is required to view or print these documents. Adobe Acrobat Reader software is available free of charge at https://acrobat.adobe.com/us/en/products/pdf-reader.html.
Applicants for construction approvals for storm water management systems should also visit the Wayne County Permit Office.
Requirements for Local Communities
Under the federal Phase II storm water regulations, all local communities in Wayne County are also required to develop, implement, and enforce programs to manage storm water from new development and re-development projects under their purview. Options to local communities for complying with this requirement include:
- Utilize an existing storm water management program in place within the community.
- Develop a new storm water management program within the community. An alternative under this option is for the local community to adopt the County program by reference.
- Implement and enforce the Wayne County Storm Water Management Program within your community under an Intergovernmental Agreement with the County.