Horsley Witten Group, Inc. Horsley Witten Group, Inc. Stormwater Management and Elements of Low Impact Development Protecting Our Water Resources – An Ecological Approach to Land Care & Design Chatham Community Center November 16, 2013 Rich Claytor Horsley Witten Group, Inc. 508-833-6600
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Stormwater Management and Elements of Low Impact Development
Stormwater Management and Elements of Low Impact Development. Protecting Our Water Resources – An Ecological Approach to Land Care & Design Chatham Community Center November 16 , 2013. Rich Claytor Horsley Witten Group, Inc. 508-833-6600. Today’s Agenda. - PowerPoint PPT Presentation
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Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Stormwater Management and Elements of
Low Impact Development
Protecting Our Water Resources – An Ecological
Approach to Land Care & Design
Chatham Community CenterNovember 16, 2013Rich Claytor
Horsley Witten Group, Inc.508-833-6600
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Today’s Agenda
• The basics of stormwater and watershed management
• The evolution of stormwater management towards Low Impact Development(LID)
• Examples of LID Practices
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Watershed Hydrology What is a watershed?A: a building for water storage
B: the land area that drains to a given water body
C: a shack from which fishing occurs
D: a moment in time when you cross into a new area
E: a new way of organizing environmental agencies
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Stormwater basicsUrbanization results in
increased surface runoff
BEFORE AFTER
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Components of Impervious Cover in the Urban Landscape
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Stormwater basics
At ~10% impervious we begin to see: •Water quality issues•Impacts to biological communities•Increased flooding•Stream erosion•Loss of recreational uses•Shellfish bed closures•Reduced baseflow and recharge
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Community Planning
LID Site Design
LID BMPs
Large Conventional BMPs
Receiving Waters
Low Impact Development (LID)
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
LID Site Planning and Design Approach
Objective - to provide a process by which LID is considered at an early stage in the planning process to prevent stormwater impacts rather than mitigate them.
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
AVOIAVOIDD
REDUCE
REDUCE MANAGEMANAGE
AVOID
AVOID
REDUCEREDUCE MANAGE
MANAGE
MANAGEMANAGE
Horsley Witten Group, Inc.Horsley Witten Group, Inc.
Low Impact Development (LID)
• Site fingerprinting– Preserve natural areas– Retain key pervious areas
• Residential– Narrow streets– Alternative turnarounds– Smart sidewalks – Shared driveways– Reduced setbacks– Open section roads– Downspout disconnection