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Key Terms:
Stormwater runoff: Rain water that runs off surfaces such as rooftops, paved streets, highways, and parking lots.
Impervious: Not allowing water to pass through
Permeable/Porous/Pervious: Allows water to pass through. Essentially same term, often used interchangeably
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Current Lot Problems:
• Sediment and car pollution from
stormwater runoff into streams
• Pot holes, mud puddles and dust
• Constant maintenance on gravel
• Environmental image issue for WWU
• Solution? 4/12
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Pervious Concrete
What can it do?
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Pervious Pavement How does it work?
What is it? • Similar to conventional, except
aggregate mix made without ‘fine’ particles
• Underneath pavement, several foot thick gravel drainage bed
• Water can infiltrate into ground water
How it can help • Eliminate sediment and pollutants
• Volume reduction of stormwater
6/12
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Cost and Benefit of Pervious Concrete
Cost • 15-20% higher cost of unconventional
pavement
• Substantial redevelopment would
trigger City of Bellingham’s new storm
water rules
Benefits • Impetus and funding to maintain failing
stormwater wetland
• Supports Western's ideals of excellence
of a college of the environment
• Solves environmental and aesthetic
issues
7 WWU’s stormwater wetland
Concrete can be made any color
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Pave upper C-Lot
• Pilot project
• Most visible parking lot
• Stormwater vault filling from west side
• Similar dimensions to largest pervious concrete parking lot in Washington
8/12
Rec Center
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Case Studies
Evergreen State College • Replaced 34,000 square feet (over
250 parking spaces) of existing landscaping to permeable pavers.
• Installed 10 parking spaces worth of pervious asphalt as a pilot.
9/12
Quil Ceda Casino • Tulalip Tribe in Tulalip, WA • Largest pervious concrete
parking lot in the state of WA. (200,000 sq ft or 22,200 sq yd)
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Cost Analysis
Type Cost for West
C-lot
Maintenance
Pervious Concrete $1.2 million* • Air vacuum street sweeper
• Pressure wash if needed
Traditional Concrete $1.05 million* • Concrete sealer 1-5 years
• Additional Stormwater management system
Gravel $30,000 +
yearly
maintenance for
lots
• Fresh gravel after rain storm to fill pot holes
• Source of sediment build up in Stormwater vault
and Stormwater wetland dredge
*Just cost of materials
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Future Works
• Continue student support and awareness • Student survey • Facebook page continuation
• Geo-tech analysis of hydraulic properties of gravel lots soil
• Cost estimate from company
11/12
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Questions?
12/12
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Potential Problems with Pervious Concrete
• Freeze/thaw issue
• Clogging of pores
• Infiltration rate of natural soil
Black ice forms on top of
adjacent impervious asphalt but
not pervious concrete
Suitable soils in blue 13/12
South Campus Parking lots