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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.

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Stormwater management and elements of low impact development

Stormwater Management and Elements ofLow 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
Today’s Agenda

  • The basics of stormwater and watershed management

  • The evolution of stormwater management towards Low Impact Development(LID)

  • Examples of LID Practices


Stormwater basics
Stormwater basics

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

Watershed Hydrology

http://planetearth.nerc.ac.uk/features/story.aspx?id=668


Stormwater basics1
Stormwater basics

Urbanization results in

increased surface runoff

BEFORE

AFTER



Stormwater basics2
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


Low Impact Development (LID)

Large Conventional BMPs

Community Planning

LID BMPs

LID Site Design

Receiving Waters


Lid site planning and design approach
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.


MANAGE

AVOID

REDUCE

AVOID

MANAGE

MANAGE

REDUCE


Low impact development lid
Low Impact Development (LID)

LID

Traditional Design

  • 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

  • Non-residential

    • Pervious spillover parking

    • Maximum parking ratios

    • Shared parking

    • Reduced stall dimensions

  • Mass clearing and grading

    • Loss of trees

    • Compaction of native soils

  • Residential

    • Wide streets and cul-de-sacs

    • Sidewalks to nowhere

    • Lots of turf

    • Curb and gutter

    • Ponds

  • Non-residential

    • Big parking lots

    • Minimum parking ratios

    • Large stall dimensions


Low impact development lid1
Low Impact Development (LID)

Traditional

LID

Site Design

BMPs


Low Impact Development (LID)

Traditional controls

LID controls

Goal: Reduce the amount of surface runoff by reducing impervious cover and preserving natural areas

Rely on small, distributed on-site practices

Infiltrate or reuse as much as possible; filter before discharge

Source controls to minimize pollution

Stormwater is a resource

  • Goal: Get the water out of here as fast as possible

  • Collect and storage in big, “hole in ground” off-site

  • Pipe discharge to a stream or wetland

  • Limited water quality treatment and infiltration

  • Stormwater is a waste product













Lid practice library porous pavement
LID Practice Library: Porous Pavement


Lid practice library porous pavement1
LID Practice Library: Porous Pavement




Lid practice library green blue roofs
LID Practice Library: Green/blue roofs


LID Practice Library: Green/blue roofs




Resources
Resources

There are many…

  • MA Smart Growth/Smart Energy Toolkit

  • MAPC LID checklist

  • Town of Franklin Best Development Practices Guidebook

  • RI Community LID Site Planning and Design Guidance Document

  • Better Site Design Handbook (CWP)

  • NH Innovative Land Use Planning Techniques



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