MMSD’s Regional Green Infrastructure Plan and The Role of Permeable Pavement
May 1, 2014
Karen Sands, AICP
Manager of Sustainability
Milwaukee Metropolitan Sewerage District
Milwaukee Metropolitan Sewerage District
We Serve: • 1.1 Million Customers
• 28 Municipalities
• 411 Square Miles
We Protect the Public & Lake Michigan:
• Convey/Store/Reclaim Wastewater
• Manage Flooding
We Do This With Infrastructure:
• Grey
• Green
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Green Infrastructure
• Complements Traditional Grey Infrastructure
• Uses Vegetation and Soil/Foundation to Manage Water Where it Falls
• Provides a Host of Benefits that Pipes Can’t
Porous Pavement’s Benefits
• Reduces Polluted Stormwater Runoff
• Recharges Groundwater
• Reduces Urban Heat Island Effect
• Melts Snow/Ice
Porous Pavement Is…
• Green Infrastructure
• Not Green, per se, but Acts Green: – Infiltrates – Stores – ≠ Evapotranspires
• Types: – Concrete – Asphalt – Concrete or Plastic Stones/Pavers,
Grids, and Geocells
Green Infrastructure In MMSD’s Discharge Permit
4.10 Wet Weather Management-Green Infrastructure
“…The practices/control measures put in place in 2013 must cumulatively have a design retention capacity of at least 1
million gallons, and each following calendar year during the permit term an additional 1 million gallons of green
infrastructure retention capacity must be put in place...”
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MMSD 2035 Vision’s Green Infrastructure Goals
• Capture the 1st 0.5” of rainfall
• Capture & reuse the 1st 0.25 gallon per SF
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Regional Green Infrastructure Plan
Porous Pavement Goes Where?
Primarily….
• Public/Private Streets
• Parking Lots
Recommendations by Green Infrastructure Strategy
740 MG =
How Big is That?
1,190 acres (900 football fields)
How Much is That?
155,400,000 gallons (2,800,000+ rain barrels)
How Much Will That Cost?
Cost Type Cost/Gallon Cost/Gallon Managed
Incremental $ 6.60 $ 1.65
Full $10.00 $ 2.50
• Total Incremental Cost of Porous: $364M
• $0.10/SF Managed Annually
Regional GI Plan Recommends Combinations
Regional GI Plan Recommendations
• Develop Regional Maintenance Standards
• Address Equipment/Training Needs
• Support Demonstration Projects
• Develop Parking Lot Retrofit Screening Program
Karen Sands, AICP Milwaukee Metropolitan Sewerage District
[email protected] 414-225-2123
www.mmsd.com www.h2ocapture.com