The Storm Drainage System—The Source of Storm Water and its Destination
Stormwater is water from rainfall that flows over the land into the City’s drainage system. The drainage system includes:
- 1,685 catch basins
- 164 manholes
- 83 outfalls
- Over 29 miles of conveyance lines
- Over 8 miles of open ditches
In addition to this constructed stormwater system, Normandy Park includes parts of four creek basins and over 4 miles of stream channel in:
- Miller Creek
- Walker Creek
- Normandy Creek
- Des Moines Creek (drainage area only; no stream channel is in the city)
Stormwater runoff and groundwater affect water quality, water quantity, and habitat in these streams. This in turn affects fish, birds, and wildlife. There also is stormwater that flows directly into Puget Sound from areas of the city close to the marine shoreline.
Regardless of how it gets there, stormwater from Normandy Park influences the overall health of Puget Sound.
National Pollutant Discharge Elimination System (NPDES) Permit
Urban areas, including Normandy Park, that collect stormwater runoff in municipal storm sewers and discharge it to surface waters are required to prepare and submit a permit under the Federal Clean Water Act.
The NPDES permit mandates Normandy Park to create and implement a Stormwater Management Program (SWMP) and submit an annual report. Normandy Park’s SWMP goal is to protect water quality by reducing the discharge of pollutants from the City’s Municipal Separate Storm Sewer System (MS4) to the maximum extent practicable.
The Components of SWMP
- Stormwater Planning
- Public Education and Outreach
- Public Involvement and Participation
- Mapping and Documentation
- Illicit Discharge Detection and Elimination
- Controlling Runoff from New Development, Redevelopment and Construction Sites
- Operations and Maintenance
- Source Control Program for Existing Development
An ongoing mapping program for mapping and documenting the Municipal Separate Storm Sewer (MS4) allows staff to maintain data for stormwater features. This map will also help with ongoing efforts to prevent, detect, characterize, trace, and eliminate illicit connections and illicit discharges into the MS4.
Normandy Park Stormwater Management Map
We Need Your Help
Everything that enters our constructed or natural drainage system finds its way into Puget Sound. Please do your part to preserve water quality and protect the environment today and for future generations:
- Employ Natural Yard Care
- Never pour oil, antifreeze, or paint on the ground or into a storm drain.
- Dispose of household hazardous waste properly.
- Keep soapy water out of storm drains by going to a commercial car wash or rinsing off the suds in a grassy area.
- Rent a Car Wash Kit: A FREE Car Wash Kit is available at City Hall. The SudSafe Car Wash Kit captures wastewater before it enters the storm drain and pumps it to either a grassy area or sewer. Detailed instructions are included in the kit. Enjoy a clean car while knowing you are helping keep our creeks, streams, and waterways clean. (A $50 refundable deposit is required)
- Direct rainwater appropriately so it can percolate into the soil. (This may not be appropriate for homes at the tops of bluffs or steep slopes.)
- Become a better steward today – see Tips on How You Can Help Miller/Walker Creeks.
Thanks for doing your part to help keep the city of Normandy Park and Puget Sound clean, healthy, and beautiful!