Watershed Management & Low Impact Development

for Litchfield Board of Realtors

Green Committee

DEP / Watershed, Lakes and NPS ProgramsMaryAnn Nusom Haverstock

Thursday, May 7, 2009

Watershed Management and Low Impact Development

LOW IMPACT DEVELOPMENT

LID is a site design strategy intended to maintain or replicate predevelopment hydrology through the use of small-scale controls integrated throughout the site to manage runoff as close to its source as possible. (2004 CT-DEP Stormwater Quality Manual)

Low Impact Development (LID)

• LID can be incorporated into many residential and municipal areas to assist in environmental and engineering benefits.– Parking– Landscaping– Residential and Municipal Site planning– Municipal road design

How to I.D. your L.I.D.

• LID design strategies can include:– Residential rain gardens– Shared driveways– Alternative pavement surface including permeable pavers– Zero lot line setback– Reduced front setback– Stormwater disconnects

– Reduction in road width– Elimination of curb and gutter– One-way cul-de-sac– Depressed island (bioretention) in cul-de-sac– Swales in right of way– Elimination of sidewalks

Watersheds in Connecticut

Jordan Cove Urban Watershed Sec. 319 National Monitoring

Program

Treatment Watersheds

Best Management Practices (BMPs)

Grassed Swale

Rain garden

Permeable pavers Bioretention cul-de-sac

Jordan CoveRecommendations Planning and Post-construction

• Cluster design – reduces imperviousness• LID ordinance – needed because of waivers• Stormwater disconnects (reducing effective imperviousness of the

site/subdivision)

• Education – social scientist addition to team• Bioretention maintenance• Paver maintenance• Turf dam (build up along paver road edges)• Fire hydrant (maintenance cleaning caused paver road washout

problems)• Seed mix (low nutrient input varieties)

Jordan Cove Project Funded in part by the CT DEP through a US EPA nonpoint source grant under § 319 Clean Water Act 

For more information, visit www.jordancove.uconn.edu

Rain Gardens

Coventry Town Hall Annex Building – Coventry, CT

Photo: TRBP

Rain Gardens

Jordan Cove Urban Watershed Project – Waterford, CT

Photo: CT DEP

Rain Gardens

UConn Storrs Campus – Mansfield, CT

Photo: CT DEP

Bioretention Areas

Evergreen Walk Mall Parking Lot – South Windsor, CT

Photo: CT NEMO

Bioretention Areas

Jordan Cove Urban Watershed Project – Waterford, CT

Photo: CT DEP

Permeable Block Pavers

Hole in the Wall Parking Lot – East Lyme, CT

Photo: CT DEP

Permeable Block Pavers

Hole in the Wall Parking Lot – East Lyme, CT

Photo: CT DEP

Permeable Block Pavers

Hole in the Wall Parking Lot – East Lyme, CT

Photo: CT DEP

Permeable Concrete Block Pavers

Hole in the Wall Parking Lot – East Lyme, CT

Photo: CT DEP

Plastic Grid Pavers

West Farms Mall Overflow Parking Lot – Farmington, CT

Photo: CT NEMO

Green Roofs

Middlesex Extension Center Demonstration – Haddam, CT

Photo: CT DEP

Green Roofs

Centerbrook Architects Building – Essex, CT

Photo: CT NEMO

Rain Barrels

Middlesex Extension Center Demonstration – Haddam, CT

Photo: CT DEP

Watershed Management List of Contacts

www.ct.gov/dep/watershed

 • Program Oversight

- MaryAnn Nusom Haverstock – 424-3347• Watershed Managers

– Eric Thomas - 424-3548– Susan Peterson – 424-3854– Chris Malik – 424-3959

• Low Impact Development Coordinator– Jessica Morgan – 418-5994

• Nonpoint Source Implementation– Stan Zaremba – 424-3730

• Lakes Management– Chuck Lee – 424- 3716