Stormwater Permitting-New Design Standards

Walker will adopt the new Stormwater Ordinance and design standards set forth by the Michigan Department of Environment, Great Lakes, and Energy (EGLE) by February 1, 2022 in compliance with the NPDES MS4 permit. This date is subject to change. 

Visit the links below or Walker's MS4 page via LGROW.org for the most up to date Stormwater Standards and design tools. 

If a new development alters the grade or drainage capabilities of the proposed site, a stormwater permit may be required.  The purpose of the stormwater permit is to ensure the site design meets both water quality and flood control requirements. These design standards protect our waterways from pollutants and erosion while also protecting our lands from flooding. 
The City of Walker will adopt an updated Stormwater Ordinance incorporating new design standards set forth by EGLE consistent with urbanized communities throughout Michigan. Highlights of the changes are summarized below:

Updated Stormwater Ordinance Design Standards: Main Points
 Water Quality  Channel Protection
  • Treat the runoff from the 90% annual non-exceedance storm (approximately 1”)
  • Reduce TSS to 80 mg/L or
  • Reduce TSS by 80%
  • Maintain post-development project site runoff volume and peak flow rate at or below pre-development for all storms up to the 2-year, 24 hour event.


Other Required Changes

  • Water quality and quantity regulations apply to road and sidewalk work if impervious surface increase is 1 acre or more.
  • Increased oversight of private stormwater facility maintenance.
  • No variance procedures.
  • No changes in flood control.  We are maintaining our 100 year flood control design standard. 
Together with the Lower Grand River Organization of Watersheds (LGROW), all Kent County MS4 communities along with collaboration with Muskegon, Ottawa, and Allegan counties, Walker helped to develop resources and tools to assist in site design under the updated standards. These are listed below along with the updated Stormwater Permit Application. 

Stormwater Design Tools
Stormwater Standards Manual revised 03-26-2021
LGROW Design Calculator V 3.4. Must design for 100 year flood control 
LGROW Design Calculator Tutorial
Volume Restriction Alternative Approach Flow Chart 

Stormwater Permit Documents updated 10-07-2021
Stormwater Permit Packet active AFTER 02-01-2022
Stormwater Maintenance Agreement-draft agreement coming soon. 
MACC BMP O&M Guide for Maintenance Agreement Development
Kent County Development Drainage Rules 

Additional Resources
LGROW.org MS4 Community Resources 
Stormwater Permitting Contact
City of Walker Engineering Department – Rachell Nagorsen: 616-791-6327

Stormwater Permit Program History
With a finite water resource and a growing population, the need to carefully and cooperatively manage and protect the City of Walker’s rivers and streams has become a priority.
In March of 2003, the Walker City Commission adopted Chapter 67 of the Walker Code of Ordinances, more commonly referred to as the Stormwater Ordinance. Following a countywide effort, the City of Walker enacted this environmental legislation to further improve the stormwater quality within our region. In 2014, Walker began the process of updating design standards to comply with new Michigan Department of Environment, Great Lakes, and Energy MS4 NPDES Permit requirements, formally adopting them in 2022. 

Helpful Related Links
Kent County Drain Commission - The mission of the Kent County Drain Commission is to establish, improve and maintain stormwater drainage for the public safety, health, convenience, and welfare of the citizens of Kent County and also to be an effective and efficient steward of our natural and fiscal resources. 
Kent County Road Commission - The Kent County Road Commission web site provides information about the road system in Kent County. Also, included are links to local townships and city web pages.
Michigan Department of Environment, Great Lakes, and Energy - The Michigan Department of Environment, Great Lakes, and Energy (EGLE, formerly MDEQ) web site is your link to information regarding the environment of Michigan. Information is available about wetlands, surface waters, environmental assistance programs, and much more. You can also find phone numbers, addresses, and web links to the different divisions of EGLE.
Robert B. Annis Water Resources Institute - The Robert B. Annis Water Resources Institute (WRI) is based at Grand Valley University and its mission is to preserve, protect, and improve our natural resources through research and public education. WRI also partners with schools and community groups to provide education and technical resources.
Grand Valley Metropolitan Council - The Grand Valley Metropolitan Council (GVMC) is an alliance of governmental units in the Grand Rapids, Michigan metropolitan area that are appointed to plan for the growth and development, improve the quality of the community's life, and coordinate governmental services.
REGIS - REGIS is a multi-participant Geographic Information System providing information in a graphical format for the use by local and county government agencies and their constituents. An example of the information available would be the location maps for the established county drains in Kent County.