Vicki M. Putala, P.E.Environmental and Water Resources Director

ohmohm--advisors.com advisors.com 888.522.6711888.522.6711

Using SRF Loans for Stormwater BMP Improvements

• 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

PresentationOverview

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.

EPA’s Definition of a Stormwater BMP

• 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

Value of Stormwater BMPs

VegetatedBioretention (aka rain gardens)BioswalesBioinfiltration trenchNaturalized stormwater areasPlanter boxes

Structural Underground detentionHydrodynamic separation (aka grit chamber)

Water ReuseCisternsRain barrels

Porous SurfacesPorous paversPorous asphaltPorous concrete

Common Types of BMPs

Bioretention/Rain Garden

Bio

swal

e

Vegetated BMPs

Vegetated BMPs

Planter Box

Und

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Det

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Hyd

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ic

Sepa

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Structural BMPs

Cistern

Rain Barrel

Water Reuse BMPs

Ston

e Pa

vers

Grass PaversAsphalt

Concrete

Porous Surface BMPs

The project plan was originally submitted in 2008

•Five sites 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

Allens Creek Project Plan

Allens Creek Project Plan2009 SRF Project Location

2008 SRF Project Location

Future Project Location

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

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)

Example #1: Pioneer High School

• Design Complete

• Bidding – Now

• Construction 2009 – 2010

Example #1: Pioneer High School

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

Example #2: City Retrofits

Several site retrofit projects underway

Retrofit Locations•Civic Center•Fire Station #3•Riverside Park•Riverwoods Park

Construction•Fall 2009

Example #2: City Retrofits

Civic Center(City Hall)

Riverside Park

• Design Complete

• Bidding – Now

• Construction 2009

• BMPs – cistern, rain garden

Example #2: City Retrofits –Civic Center(Field House)

• Design Complete

• Bidding – Now

• Construction 2009

• BMPs – planter boxes, rain garden

Example #2: City Retrofits –Civic Center (City Hall)

• Design Complete

• Bidding – Now

Example #2: City Retrofits –Fire Station #3

• Construction 2009

• BMPs – rain garden

• Design Complete

• Bidding – Now

Example #2: City Retrofits –Riverside Park

• Construction 2009

• BMPs – infiltration trench, vegetated filter strip

• Design Complete

• Bidding – Now

Example #2: City Retrofits –Riverwoods Park

• Construction 2009

• BMPs – bioswale and rain garden

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

Example #3: Galloway Creek

• Design Complete

• Bidding – Now

• Construction 2009/2010

• BMPs – vegetative buffer, naturalized stormwater areas

Example #3: Galloway Creek

Bioretention/Rain Gardens– Biannual weeding– Refresh plantings (if necessary)

Porous concrete/asphalt– Annual vacuum sweeping

Underground Detention/Hydrodynamic Separation– Annual inspection and vactoring

Maintenance Considerations

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.

Funding Stormwater BMPs

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

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

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 determiningproject eligibility

– Project Plan must quantify pollution reduction and resulting cost-benefit analysis is helpful in prioritizing projects

Tips for Moving Forward

Vicki M. Putala, P.E.vicki.putala@ohm-advisors.com734-466-4479

Orchard, Hiltz & McCliment, Inc34000 Plymouth RoadLivonia, MI 48150www.ohm-advisors.com888-522-6711

Questions?