The document discusses the value and types of stormwater Best Management Practices (BMPs) aimed at reducing nonpoint source pollution and improving water quality. It highlights specific projects, such as the Allens Creek project and city retrofits in Auburn Hills, detailing their goals, designs, and stakeholders involved. Additionally, it provides maintenance considerations and tips for successful implementation and funding of stormwater BMPs.

1. Using SRF Loans for Stormwater
BMP Improvements
Vicki M. Putala, P.E.
Environmental and Water Resources Director
ohm-advisors.com
888.522.6711

2. Presentation Overview
• Value of Stormwater BMPs
• Common Types of Stormwater BMPs
• Example Nonpoint Source SRF Projects
• Allens Creek Pioneer High School
• Auburn Hills City Retrofit
• Auburn Hills Galloway Creek
• Maintenance Considerations
• Funding Stormwater BMPs
• Tips for Moving Forward

3. EPA’s Definition of a Stormwater
BMP
A BMP is a technique, process, activity or structure used to
reduce the pollutant content of a stormwater discharge.
BMPs include structural modifications, such as the
installation of bioretention. BMPs are most effective when
used in combination with each other, and customized to
meet specific needs.
BMPs may also include simple nonstructural methods,
such as good housekeeping and preventive maintenance.

4. Value of Stormwater BMPs
• Reduces nonpoint source pollution
• Helps permittees comply with National Pollution Discharge
Elimination System (NPDES) requirements
• Helps Meet Total Maximum Daily Load (TMDL) Objectives in
Streams
• Improves Base Flow in Streams and Reduces Flashy
Hydrology

5. Common Types of BMPs
Vegetated
Water Reuse
Bioretention
(aka rain gardens) Cisterns
Bioswales Rain barrels
Bioinfiltration trench
Naturalized stormwater areas Porous Surfaces
Planter boxes Porous pavers
Porous asphalt
Structural Porous concrete
Underground detention
Hydrodynamic separation
(aka grit chamber)

6. Vegetated BMPs
Bioretention/
Rain Garden
Bioswale

7. Vegetated BMPs
Planter Box

8. Underground
Detention
Structural BMPs
Hydrodynamic
Separation

9. Water Reuse BMPs
Rain Barrel
Cistern

10. Porous Surface BMPs
Concrete
Stone Pavers
Asphalt Grass Pavers

11. Allens Creek Project Plan
The project plan was originally submitted in
2008
•Fivesites were identified for stormwater BMPs
•Three road reconstruction and two retrofits
An amendment was submitted in 2009
•Seven sites were identified for stormwater BMPs
•Five road reconstruction and two site retrofits

12. Allens Creek Project Plan
2009 SRF Project Location
2008 SRF Project Location
Future Project Location

13. Example #1: Pioneer High
School
Contributing Area: 308 acres (Allens Creek
watershed 3,360 acres)
Location: City of Ann Arbor
County Jurisdiction: Washtenaw County Water
Resources Commissioner – Janis Bobrin
Stakeholders: Washtenaw County, City of Ann
Arbor, Ann Arbor Public Schools, Allens Creek Advisory
Group & City residents

14. Example #1: Pioneer High
School
•Project Goal: Reduce total suspended solids,
phosphorus and E.coli
•Two large underground detention basins with
infiltration
– 256,000 cubic feet of storage
– 10% of stored volume infiltrated
•Hydrodynamic Separators (aka grit chambers)

15. Example #1: Pioneer High
School
• Design Complete
• Bidding – Now
• Construction
2009 – 2010

16. Example #2: City Retrofits
Location: City of Auburn Hills
Stakeholders: City of Auburn Hills and the Clinton
River Watershed Council
Project Oversight: Shawn Keenan – Stormwater
Coordinator (City of Auburn Hills)
BMP Types: Rain gardens, water reuse cisterns,
planter boxes, vegetated filter strip, infiltration trench
and bioswale

17. Example #2: City Retrofits
Several site retrofit projects underway
Retrofit Locations
•Civic Center
•Fire Station #3
•Riverside Park
•Riverwoods Park
Civic Center
Construction (City Hall)
•Fall 2009
Riverside Park

18. Example #2:
City Retrofits –
Civic Center
(Field House)
• Design Complete
• Bidding – Now
• Construction 2009
• BMPs – cistern, rain
garden

19. Example #2: City Retrofits –
Civic Center (City Hall)
• Design Complete
• Bidding – Now
• Construction 2009
• BMPs – planter boxes, rain
garden

20. Example #2: City Retrofits –
Fire Station #3
• Design Complete • Construction 2009
• Bidding – Now • BMPs – rain garden

21. Example #2: City Retrofits –
Riverside Park
• Design Complete • Construction 2009
• Bidding – Now • BMPs – infiltration
trench, vegetated filter
strip

22. Example #2: City Retrofits –
Riverwoods Park
• Design Complete • Construction 2009
• Bidding – Now • BMPs – bioswale
and rain garden

23. Example #3: Galloway Creek
Location: City of Auburn Hills
Stakeholders: City of Auburn Hills and the Clinton
River Watershed Council
Project Oversight: Shawn Keenan – Stormwater
Coordinator (City of Auburn Hills)
BMP Types: Streambank stabilization, vegetative
buffer and naturalized stormwater detention areas

24. Example #3: Galloway Creek
• Design Complete
• Bidding – Now
• Construction
2009/2010
• BMPs – vegetative
buffer, naturalized
stormwater areas

25. Maintenance Considerations
Bioretention/Rain Gardens
– Biannual weeding
– Refresh plantings (if necessary)
Porous concrete/asphalt
– Annual vacuum sweeping
Underground Detention/Hydrodynamic Separation
– Annual inspection and vactoring

26. Funding Stormwater BMPs
Allens Creek Drainage District is made up of three
entities: City of Ann Arbor, MDOT and Washtenaw
County. The City’s share of the loan is paid from an
existing stormwater utility fee.
City of Auburn Hills will pay back the loan through
their General Fund.

27. Tips for Moving Forward
Find partners and build a team
– Local schools
– Watershed groups
– Neighborhood groups
– Local businesses and /or developers
Determine opportune locations within your community
– Make use of all spatial data (GIS data)
– Consider upcoming capital improvements projects or
redevelopment
Identify regional alternatives or site specific
– Consider large scale or suites of BMPs

28. Tips for Moving Forward
Gentle/Flat Slopes for Porous Pavement
– Should be less than 5%
Low/moderate Traffic Volumes
– Porous surfaces work best on low volume roads and/or parking
areas
Infiltrating Soils
– Preferably NRCS hydrologic groups A, B or C
– When poor soils exist (group D) soil amendments and underdrains
may be necessary
Salt and Sand Usage
– Vegetated BMPs must be planted with salt torrent species when
receiving road runoff
– Sand usage is discouraged on porous roadways due to increased
potential for void space clogging

29. Tips for Moving Forward
Eligibility Criteria
– Must meet goals identified in a state approved watershed
management plan (CMI or 319)
– Must achieve nonpoint source pollution reduction
Public Involvement
SRF application through Project Plan (due annually by July 1st)
– Project Plan can identify proposed and future projects
– Work with MDEQ early in planning phase especially in determining
project eligibility
– Project Plan must quantify pollution reduction and resulting cost-
benefit analysis is helpful in prioritizing projects

30. Questions?
Vicki M. Putala, P.E.
vicki.putala@ohm-advisors.com
734-466-4479
Orchard, Hiltz & McCliment, Inc
34000 Plymouth Road
Livonia, MI 48150
www.ohm-advisors.com
888-522-6711