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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
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• Application of Concepts• New and Redevelopment• Identify Opportunities and Constraints• Identify IMPs• Discuss Results
Objectives
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LID UFC Process
• Define Planning Goals
• Perform Site Evaluation
• Develop LID Strategies
• Prepare LID Concept Design
• Target O & M Strategy
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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
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• Rehabilitate parking and circulation
• Construct new warehouse/office
• Integrate facilities
Program
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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
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• Development and Redevelopment
• Use VA for development and MD for redevelopment example goals
• EISA comparison
Common Stormwater Goals
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• % 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
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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
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EISA 438: Norfolk 95Th Percentile
• 1.63 Inches
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UFC Tools
• LID Manual NRCS Charts
• 95th Percentile Charts
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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
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Copyright 2009 Low Impact Development Center, Inc.
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Copyright 2009 Low Impact Development Center, Inc.
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• Slide is blank
What are LID, Environmental, and SWM Issues?
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Disconnectivity, bioretention, etc..
Copyright 2009 Low Impact Development Center, Inc.
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Pavers and roofCopyright 2009 Low Impact Development Center, Inc.
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What are issues with new area?
• Slide is blank.
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Copyright 2009 Low Impact Development Center, Inc.
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Copyright 2009 Low Impact Development Center, Inc.
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Copyright 2009 Low Impact Development Center, Inc.