low impact development training: planning exercise presented by: the low impact development center,...

Low Impact Development Training:Planning Exercise

Presented by:

The Low Impact Development Center, Inc. A non-profit water resources and sustainable design organizationwww.lowimpactdevelopment.org

• Application of Concepts• New and Redevelopment• Identify Opportunities and Constraints• Identify IMPs• Discuss Results

Objectives

LID UFC Process

• Define Planning Goals

• Perform Site Evaluation

• Develop LID Strategies

• Prepare LID Concept Design

• Target O & M Strategy

Four Phases forLID Planning Phases for New and Repair/Demo Projects

Phase 1. INSTALLATION WIDE LID

ASSESSMENT MEETING

Phase 2. SITE SELECTION

Phase 3. CONCEPTUAL SITE DESIGN

Phase 4. SITE RESTORATION

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 2SITE

SELECTION

STEP 2SITE

SELECTION

STEP 3

CONCEPT SITE

DESIGN

STEP 3

CONCEPT SITE

DESIGN

STEP 4 SITE

RESTORATION

STEP 4 SITE

RESTORATION

NEW CONSTR.NEW CONSTR. REPAIRREPAIR DEMOLITIONDEMOLITION

INSTALLATION PLANS

INSTALLATION PLANS

AREAPLANS

AREAPLANS

SITEPLANS

SITEPLANSPLANNING

PRODUCTS

APPLIES TOTHESEPRODUCTS

• Rehabilitate parking and circulation

• Construct new warehouse/office

• Integrate facilities

Program

Phase 1. ANNUAL LID ASSESSMENT MEETINGAnnual Meeting:

1. Meet w/ EV, CI to understand SW Regulations

2. Understand LID objectives and reporting

3. Review installation map; identify environmental

resources, buffer requirements, soils

4. Overall drainage systems (natural & man-made)

5. AM & EV develop LID opportunities map?

NEW CONSTR.NEW CONSTR. REPAIRREPAIR DEMOLITIONDEMOLITION

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 2SITE

SELECTION

STEP 2SITE

SELECTION

STEP 3CONCEPT

SITEDESIGN

STEP 3CONCEPT

SITEDESIGN

STEP 4SITE

RESTORATION

STEP 4SITE

RESTORATION

INSTALLATION PLANS

INSTALLATION PLANS

AREAPLANS

AREAPLANS

SITEPLANS

SITEPLANSAPPLIES TO

THESEPRODUCTS

Goal: understand and communicate

basewide LID strategies,

opportunities & constraints

• Development and Redevelopment

• Use VA for development and MD for redevelopment example goals

• EISA comparison

Common Stormwater Goals

• % Imperviousness (assume 65%)

• Rainfall Depth/ESD Runoff Depth

• QE = PE*Rv 0r ~1.24”

• Post Cn > Pre and PE>1 inch so calc Cpv

• Approx 0.4 inch depth over surface so if 30 acres then 4,500 cf

Virginia Key Points

Maryland Key Points

• Redevelopment (Assume 40% imperviousness):• Reduce Impervious area by 50% or,• ESD/LID for wq for 50% or,• ESD and reduction for 50%

• OR• On-site structural or,• Off-site structural for 50% or, • Or Combination

• OR• Retrofit off-site• Stream restoration• Trading• Planning

• AND… • Implement ESD for NET INCREASE in impervious areas

EISA 438: Norfolk 95Th Percentile

• 1.63 Inches

UFC Tools

• LID Manual NRCS Charts

• 95th Percentile Charts

PHASE 2. SITE SELECTION - new site/ new construction

Meet w/ EV, CI to identify

1. Review obj., reg., opportunities, and LID assessment

from Step 1

2. EV identify wetlands, rivers, streams, vegetative

buffers, steep slopes, and erodible soils

2. CI or EV identify current hydrologic conditions

(permeable and impermeable soils, vegetated areas

3. CI or EV identify natural and existing drainage systems

4. AM create building envelopes map where development

can occur with least impact

Goal: Choose best site w/ least impact

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 1OBJECTIVES;

OPPORTUNIES

STEP 2SITE

SELECTION

STEP 2SITE

SELECTION

STEP 3CONCEPT

SITEDESIGN

STEP 3CONCEPT

SITEDESIGN

STEP 4SITE

RESTORATION

STEP 4SITE

RESTORATION

NEW CONSTR.NEW CONSTR. REPAIRREPAIR DEMOLITIONDEMOLITION

INSTALLATION PLANS

INSTALLATION PLANS

AREAPLANS

AREAPLANS

SITEPLANS

SITEPLANSAPPLIES TO

THESEPRODUCTS

EVchecklist

SiteApproval

Copyright 2009 Low Impact Development Center, Inc.

Copyright 2009 Low Impact Development Center, Inc.

• Slide is blank

What are LID, Environmental, and SWM Issues?

Disconnectivity, bioretention, etc..

Copyright 2009 Low Impact Development Center, Inc.

Pavers and roofCopyright 2009 Low Impact Development Center, Inc.

What are issues with new area?

• Slide is blank.

Copyright 2009 Low Impact Development Center, Inc.

Copyright 2009 Low Impact Development Center, Inc.

Copyright 2009 Low Impact Development Center, Inc.