low impact development applicationsmedia.clemson.edu/public/restoration/carolina clear... ·...
TRANSCRIPT
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Low Impact Development
ApplicationsStormwater Compliance Support Workshop
Geoff Smith, P.E.
BP Barber
June 3, 2010
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Outline
Background
LID Goals
Design Strategies
Practice Examples
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LID Background
What is LID?
Technology based
Hydrologic evaluation
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LID Background
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LID Mechanisms
Impervious cover reduction
Increased green space
Open space preservation
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LID Goals
Discharge reduction
Peak and volume
Water quality treatment
Infiltration
Aquifer Recharge
Less reliance on traditional facilities
Peak and volume
Increased green space
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Design Strategies
Non-structural
Regulatory mechanisms
Site Planning
Buffer setbacks
Structural
Water quality improvements
Aquifer recharge
Water reuse
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Non-structural LID Practices
Regulatory ordinances
Design requirements
Utility “credits”
Development Design
Cluster development
“Micro” treatment
Source Control
Buffer Setbacks
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Green Space
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Structural Practices - Overview
Small Scale water reuse
Cisterns
Rain Barrels
Development
Infiltration
Treatment trains
Storage
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Structural Practices
Discharge Reductions
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Bioretention
Versatile application
Aesthetically pleasing in urban environments
Relatively low maintenance costs compared to
traditional BMPs
Design considerations:
Water quality treatment of first flush
Small water quantity control
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Bioretention
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Bioretention
BMP Type Pollutant Treated Removal Efficiency
Bioretention Total Suspended Solids 50-85%
Copper 35-70%
Zinc 35-90%
Total Nitrogen 35-55%
Lead 50-90%
Total Phosphorous 55-70%
Pathogens (fecal) 10-60%
Bioretention Areas:
Applications
Parking lots
Individual home sites
Small commercial sites
Advantages
Low maintenance
Size vs. treatment
“Green” applications
Drawbacks
Potential Cost
Size restrictions
Limited quantity control
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Pervious Pavement
Infiltration recharge
Reduced runoff
Varied Applications
Design considerations:
Low traffic areas
Pedestrian walkways
Significant reduction in impervious cover
Routine maintenance required
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Pervious Pavement
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Pervious Pavement
Center for Watershed Protection
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Grassed Swales
Reduced Discharge velocities while
maintaining “design” volume capacity
Dry swales vs. wet swales
Design based on soil and landscape conditions
Lining materials can vary
Low maintenance
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Grassed Swales
Typical dry swale profile
Typical wet swale profile
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Grassed Swales
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Infiltration Trenches
On-site storage
Low water table preferred
Used as part of a treatment train
Routine maintenance necessary
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Infiltration Trenches
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Infiltration Trenches
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Conclusion
Design considerations
Regulatory mechanisms
Cost considerations
Water quality treatment
Aesthetic benefits
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Discussion