FWWA Conference: Municipal 20%40% TSS Reduction Compliance

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PRESENTATION
Stormwater Quality Garners Creek Watershed
Phil KlemanMcMahon September 10, 2009
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When it rains, impervious surfaces create large
amounts of runoff.
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Runoff washes urban pollutants into the
municipalitys storm sewer system.
Municipal Storm Sewers Discharge Urban Pollutants
into Streams, Rivers and Lakes
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Sediments
Impact
Example of stormwater samples collected from a
residential storm sewer.
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Nutrients
Impact

• Phosphorus
• Nitrogen

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Bacteria Pathogens
Impact
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Heavy Metals
Impact
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Pesticides Herbicides
Impact
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Oil Grease
Impact
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Garners Creek Watershed

• 11.8 square miles
• 77 developed
• Primarily clay soils

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Cities, Villages Towns in Watershed
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303(d) Impaired Waters
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303(d) Impaired Waters

• Fox River
• Pollutants Phosphorus
• Impairment Low dissolved oxygen
• PS/NPS Blend
• Garners Creek (2008 addition)
• Pollutants Phosphorus sediment
• Impairment Degraded habitat
• PS/NPS Blend

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Garners Creek Impacts

• Peak discharge fluctuations
• Stream erosion degraded habitat
• Water quality concerns
• Sediment turbidity
• Phosphorus algae
• Bacteria

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Stream Erosion Projects within Area of Control
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Street Sweeping BMP
Before Street Cleaning
After Street Cleaning
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Catch Basin Cleaning BMP
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Grass Swale BMP
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Biofiltration BMP

• Filtration device
• Engineered soil
• Perforated pipe

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Bioretention BMP

• Infiltration device
• Engineered soil
• Perforated pipe

Bioretention
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Rain Garden BMP

• Infiltration device
• No engineered soil
• No perforated pipe

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Infiltration Basin / Trench BMP

• Infiltration device
• No engineered soil
• No perforated pipe

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Proprietary Device BMP
StormFilter (filtration)
Stormceptor (sedimentation)
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Wetland / Wet Pond BMP
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Mechanical Treatment BMP
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Option 5 for 40 TSS Reduction - Satisfy
Garners Creek 1955 Peak Flow Goal
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Questions ?
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