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Low Impact Development They took all the trees and put them in a tree museum and they charged all the people a dollar and a half just to see 'em. Don't it always seem to go that you don't know what you've got till it's gone? They've paved paradise and put up a parking lot.” Joni Mitchell
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TABLE OF CONTENTS Development and Storm Water Runoff Storm Water Pollutants Low Impact Development (LID) Goals Benefits Common Practices
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Development and Storm Water Runoff 40% evaporation 25% deep infiltration 25% shallow infiltration 10% runoff 38% evaporation 21% deep infiltration 21% shallow infiltration 20% runoff 35% evaporation 15% deep infiltration 20% shallow infiltration 30% runoff 30% evaporation 5% deep infiltration 10% shallow infiltration 55% runoff Natural Groundcover 10 - 20% Cover 35 – 50 %l Cover 75 - 100% Cover
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Storm Water Pollutants Not treated – Flows directly to nearest stream Picks up pollutants –Sediment –Pathogens –Nutrients –Toxic contaminants –Debris/litter ©iStockphoto.com
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Low Impact Development (LID) A storm water management approach that uses green space, native landscaping, and other techniques to reduce the volume of and improve the quality of storm water runoff.
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Goals of LID Mimic predevelopment hydrology Reduce storm water runoff and pollution –Store –Treat –Infiltrate EPA
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Benefits Effective Economical Flexible Adds value
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Common LID Practices Rain gardens and bioretention Rooftop gardens Vegetated swales, buffers, and strips Rain barrels and cisterns Permeable pavers Permeable pavement Impervious surface reduction
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Common LID Practices Rain gardens and bioretention Image by the Environmental Protection Agency
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Common LID Practices Green roof Courtesy Eric Fisher Image by the Environmental Protection Agency
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Common LID Practices Vegetated swales, buffers, and strips Courtesy Eric Fisher Image by the Environmental Protection Agency
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Common LID Practices Rain barrels and cisterns ©iStockphoto.com
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Common LID Practices Permeable pavers Image by the Environmental Protection Agency
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Common LID Practices Permeable pavement Image by the Environmental Protection Agency
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Common LID Practices Impervious surface reduction ©iStockphoto.com
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Conventional Versus LID Site Design Conventional Site Design Low Impact Development Site Design
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LID Commercial Design Image by the Environmental Protection Agency
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LID Commercial Design Image by the Environmental Protection Agency
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TABLE OF CONTENTS Development and Storm Water Runoff Storm Water Pollutants Low Impact Development (LID) Goals Benefits Common Practices
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Resources Bioretention.com: An online reference for designers. (n.d). Retrieved Dec. 15,2009 from http://www.bioretention.com/http://www.bioretention.com/ Department of Environmental Resources of Prince George’s County, Maryland. (1999). Low-Impact Development Design Strategies –An Integrated Design Approach. Retrieved December 15, 2009, from http://www.lowimpactdevelopment.org/pubs/LID_National_Manual.pdf http://www.lowimpactdevelopment.org/pubs/LID_National_Manual.pdf Environmental Protection Agency. (n.d). Stormwater management best practices. Retrieved December 15, 2009, from http://www.epa.gov/greeningepa/stormwater/best_practices.htm#per meablepavers http://www.epa.gov/greeningepa/stormwater/best_practices.htm#per meablepavers Low Impact Development Center, Inc. (n.d.). Urban design tools. Retrieved December 15, 2009, from http://www.lid-stormwater.net/index.htmlhttp://www.lid-stormwater.net/index.html
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Low Impact Development
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