PENNOYER BEACH OUTFALL STORMWATER INFILTRATION BASINKenosha Stormwater Utility

Great Lakes Restoration ConferenceHealing Our Waters ® - Great Lakes Coalition

October 14, 2011

Kenosha, Wisconsin

City of KenoshaPopulation: 99,218

Square Miles: 26.6

Watersheds: - Pike River -> Lake Michigan- Lake Michigan Direct Tributaries - Des Plaines River -> Mississippi River

Located:- Approx. 32 miles from Milwaukee- Approx. 52 miles from Chicago

City Owns approx. 4.5 miles of the 6 miles of Lake Michigan Shoreline within the City of Kenosha. Kenosha, Wisconsin

Lake Michigan

Beaches

- 5 Beaches within the City of Kenosha - this will be the first project to enhance water quality at an outfall within the City limits

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Major Outfalls

- There are 9 major outfalls within the City of Kenosha that discharge directly into Lake Michigan.

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GLRI Grant for Pennoyer Beach Outfall Infiltration BasinNearshore Health and Nonpoint Source Pollution

Project PurposeKenosha Stormwater Utility is committed to:- Protecting the water resources within the City of Kenosha for the use and benefit of the public.

- Providing educational opportunities for the residents, visitors and school age children to identify the issues surrounding the health of our natural resources including the impacts stormwater has on our environment.

The Pennoyer Outfall provided an opportunity to combine these two goals into an educational opportunity to have a project on the ground that helps identify these issues while providing a method to enhance water quality.

Pennoyer Beach Health

- Impaired beach by the Wisconsin DNR due to high levels of bacteria encountered during monitoring. Beach often closed due to high levels of bacteria

- Testing of the outfall resulted in an average reading of 2,500 MPN / 100 mL which is approximately an order of magnitude higher then acceptable levels for bathing/human contact. (UW-Parkside/Kinzelman, 2006)

Taken By: Aerial Photos of America 2004

Pennoyer Beach

Lake Michigan

Mouth of the Pike River and Shoreline of Lake Michigan

Pike River

Pennoyer Beach Health

- Heavy storms often create turbulent flows that impact the beach causing sedimentation to be discharge to the Lake.

- Seagulls concentrate on the beach which may also be the cause of poor water quality.

Photos Courtesy of Julie Kinzelman

Characteristics of Pennoyer Outfall

- Drainage Area – 29 Acres

- 98% Residential Land Use

- A 36-inch stormwater outfall discharges to a public beach in Pennoyer Park.

Outfall

Project Purpose

Design and Construction of:- Stormwater Treatment and Infiltration

Basin at the storm sewer outfall on Pennoyer Beach

- System of Upstream Best Management Practices (BMPs) to aid in the performance of the basin as well as reduce operation and maintenance costs.

- Sub-Surface Sedimentation Vaults- Parkway Bioswale Installation

Taken By: Aerial Photos of America 2004

Discharge from Pennoyer Outfall on Pennoyer Beach

Nearshore Health and Nonpoint Source Pollution

Project Details

Preliminary Plan designed by the SWU’s Consulting Firm - AECOM

Infiltration Basin

Preliminary Plan designed - AECOM

Stormwater Treatment Infiltration Basin will:

- Collect, Detain, Store, Filter and Infiltrate Stormwater from the Drainage Area

- Reduce Bacterial Loading onto the Beach

- Reduce nonpoint source pollutants (sediments) by reducing some of the turbulent flows

- will modify the outfall location to allow for more acceptable grade transition from top of the hillside to the beach

Infiltration Basin

Photo Courtesy of AECOMBradford Beach – Milwaukee, WI

Stormwater Treatment Infiltration Basin will:

- Be planted with Native Plants and Beach Grasses creating a berm/dune around the outer limits and reduce erosion issues.

- Provide a change to the ecosystem to potentially make this area less attractive to sea gulls who prefer open areas. Julie Kinzelman’s research has found approximately 8,080 gulls during 43 monitoring events which likely play a factor in the health of Pennoyer Beach.

- Will take approximately 2-3 years for plants to mature

Subsurface Sedimentation Vaults

Photo Courtesy of AECOM(Not Pennoyer Beach)

Subsurface Sedimentation Vaults will:

- Act as a pretreatment device for the infiltration basin

- Collect Debris and some sediment before discharging into the Treatment/Infiltration Basin

• extend the life of the facility

• reduce the operational and maintenance costs associated with the basin.

Parkway Bioswales

Parkway Bioswales will:

- Act as a pretreatment device for the infiltration basin

- Provide an Educational Component to the neighborhood, residents, visitors and children

- Allow the residents to take ownership of the project

- Provide a reminder that what we do on our properties and within our communities impacts our Lake

Source: www.washington-apa.org

Design Obstacles

Photo Courtesy of AECOM

Carriage Walks, Driveway, Trees

Parkway Widths

Utilities – Power Poles, Street Lights,Storm Sewers, Gas and electric

Parkway Bioswale Location Selection

Bioswale Location Selection

Public Concerns

Photo Courtesy of Julie Kinzelman

“Debris” “Basin may ruin the beach” “Maintenance”

This project will improve all of these concerns

Public Education

“You mean this goes directly to the Beach and Lake?”Resident who attended an outreach event

Public Education – Outside GLRICollaborated Effort

Source: http://www.enviroscapes.com/nonpoint-source.htmlPhoto Courtesy of Root-Pike WIN

Southeast Wisconsin Clean Water Network – 17 Communities joining together for public education

Questions and Answers

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