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

TABLE OF CONTENTS Development and Storm Water Runoff Storm Water Pollutants Low Impact Development (LID) Goals Benefits Common Practices

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 % Cover 35 – 50 %l Cover % Cover

Storm Water Pollutants Not treated – Flows directly to nearest stream Picks up pollutants –Sediment –Pathogens –Nutrients –Toxic contaminants –Debris/litter ©iStockphoto.com

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.

Goals of LID Mimic predevelopment hydrology Reduce storm water runoff and pollution –Store –Treat –Infiltrate EPA

Benefits Effective Economical Flexible Adds value

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

Common LID Practices Rain gardens and bioretention Image by the Environmental Protection Agency

Common LID Practices Green roof Courtesy Eric Fisher Image by the Environmental Protection Agency

Common LID Practices Vegetated swales, buffers, and strips Courtesy Eric Fisher Image by the Environmental Protection Agency

Common LID Practices Rain barrels and cisterns ©iStockphoto.com

Common LID Practices Permeable pavers Image by the Environmental Protection Agency

Common LID Practices Permeable pavement Image by the Environmental Protection Agency

Common LID Practices Impervious surface reduction ©iStockphoto.com

Conventional Versus LID Site Design Conventional Site Design Low Impact Development Site Design

LID Commercial Design Image by the Environmental Protection Agency

LID Commercial Design Image by the Environmental Protection Agency

TABLE OF CONTENTS Development and Storm Water Runoff Storm Water Pollutants Low Impact Development (LID) Goals Benefits Common Practices

Resources Bioretention.com: An online reference for designers. (n.d). Retrieved Dec. 15,2009 from 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 Environmental Protection Agency. (n.d). Stormwater management best practices. Retrieved December 15, 2009, from meablepavers meablepavers Low Impact Development Center, Inc. (n.d.). Urban design tools. Retrieved December 15, 2009, from

Low Impact Development