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City of San Diego Low Impact Development Design … of San Diego Low Impact Development Design...
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City of San Diego Low ImpactDevelopment Design Manual
LID SymposiumSeptember 2011
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Jason Wright, P.E.
Jim Nabong, P.E.
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Project Team
City Staff:• Sumer Hasenin• James Nabong
Tetra Tech Staff:• Scott Struck• Jason Wright• Chad Helmle
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• Garbini and Garbini Landscape Architecture, Inc.
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Presentation Outline
• Goals of the Project• LID Design Manual Contents
– Introductory Concepts– Site Assessment, Planning, and Site Design– Selection of Structural BMPs– Implementation Considerations– Appendices: Fact sheets, design templates
& more…
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How do we make this… function more like this?
Overall Watershed-based Goal
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Companion Manuals
• Storm Water Standards: clarifies criteria for compliance
• The LID Design Manual: clarifies acceptable LID design practices
• Compatible with the Street Design & Drainage Design Manuals
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LID Manual Approach
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• Provide design guidelines for Engineers, Planners, and Maintenance Staff– Links to Stormwater Standards– Provides Step-by-Step Planning
Process– BMP Selection Matrix
• BMP Sizing Tool• Detailed Design Guidance• BMP Design Templates (MS)• Fact Sheets/Plant List/O&M
Checklist
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Low Impact Development Concepts
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Under Natural Conditions Runoff is
Limited........But increases After
Development
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Stormwater Management and LID Concepts
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LID incorporated into traditional parking lot design minimizes alterations to natural hydrology.
Vegetated filter strips reduces pollutants washed into storm water.
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Incorporating LID in CIP
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Conceptual rendering of the University Avenue Mobility Plan.
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Regional Considerations
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Site Assessment, Planning, and Site Design
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Step by Step Process – Step 1 (New / Redevelopment / Retrofit)
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To Complete Step 1:Identify applicable zoning, land use, subdivision, and other regulationsIdentify setbacks, easements, and utilitiesIdentify targeted pollutants and pollutants of concern
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Step by Step Process – Step 9 (Planned Site)
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To Complete Step 9:Integrate conventional stormwater management needsFinish details and notesComplete the site plans
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General Descriptions of BMP Practices
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Pollutants
Removal processes
Settl
ing
Filtr
atio
n/st
rain
ing
Sorp
tion
Bio
accu
mul
atio
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Bio
tran
sfor
mat
ion/
ph
ytor
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iatio
n
Oth
er (e
.g.,
phot
olys
is;
vola
tiliz
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n)
Sediment + + – – – –Nutrients + o + + + –Trash + + – – – oMetals + – + + + –Bacteria + (+) – + + & + *
Oil and grease – + + o + +
Organics + o o + + +Note: ( ) optional function; + major function; o secondary function; –insignificant function; & consumed by other organisms; * photolysis
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General Descriptions of BMP Practices
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Structural BMPs
Hydrologic controls Removal processes
Stor
age/
dete
ntio
n or
flow
atte
nuat
ion
Infil
trat
ion
Evap
otra
nspi
ratio
n Settl
ing
Filtr
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Sorp
tion
Bio
accu
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atio
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Bio
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ph
ytor
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Oth
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.g.,
phot
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vola
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Bioretention + (+) o o + o + + (o)Bioswale (+) (+) o o o o o o (o)Permeable pavement + (+) – – + – – – –Infiltration trench + + (o) o + o – – –Planter boxes + (+) o o + o (+) (+) (o)Sand filter o (o) – – + (o) – – (o)Vegetated filter strip – + + o o o – – –Vegetated swale (o) (o) o + + – – – –Cisterns/rain barrels + – – – – – – – –Note: ( ) optional function; + major function; o secondary function; – insignificant function
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LID Selection – Structural BMPs
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BioretentionArea Typically Served (acres): < 5Area Required for BMP: 4%–8%Major Maintenance: Mowing/plant replacementEffective Life Time: 5–20 yearsPollutant RemovalSediments: High Nutrients: MediumTrash: High Metals: HighBacteria: High Oil & Grease: HighOrganics: High
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3. General Descriptions of BMP Practices
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LID practice type
Bioretentiona Planter boxes Sand filter Vegetated swaleAttribute (no UD) (UD) (no UD) (UD)Contribute drainage area (acres) < 5 < 0.35 < 5 < 2Soil infiltration rate (inches/hour) > 0.5 < 0.5 N/A > 0.5 < 0.5 > 0.5Water table separation (feet) > 10 ft ≥ 2 ft N/A > 10 ft ≥ 2 ft > 10 ftDepth to bedrock (feet) > 10 ft ≥ 2 ft N/A > 10 ft ≥ 2 ft > 2 ftUnit slope < 2% N/A < 6% < 4%Pollutant Removal
Sediments High High High MediumNutrients Medium Medium Low LowTrash High High High LowMetals High High Low MediumBacteria High High Medium LowOil & grease High High Medium MediumOrganics High High Medium Medium
Runoff volume reduction High Medium Low Medium Low LowPeak flow control Medium Low Medium LowGroundwater recharge High Low N/A Medium Low LowSetbacks (ft) Structures > 10 ft > 10 ft
Steep slopes > 50 ft > 50 ft
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LID Manual – Appendix B
– Design Details• Description
– Advantages / Disadvantages– Major Design Elements
– Characteristics and Functions• Based on Documented Research
• 9 Step Design Process• Photos, Design Templates,
Schematics,
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LID Manual – Appendix B
• 9 Step Design Process1.BMP Configuration2.Determine the volume of water to treat3.Calculate the surface area required4.Determine the depth and type of soil media5.Design the inlet configuration6.Determine if an underdrain pipe is
necessary7.Select the appropriate overflow or bypass
method8.Select mulch and vegetation9.Additional considerations
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LID Manual – Appendix B
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LID Manual – Appendix B
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LID Manual – Appendix B -Common Elements
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LID Manual – Appendix C• Appendix C Design Templates
• Templates/details that can be used in designs
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LID Manual – Appendix D
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• Design Fact Sheets – Provide general description, example picture, considerations,
water quality benefits, but little explanation
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LID Manual – Appendix E• Local Plant Listxposure, zones
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LID Manual – Appendix F
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Facility Inspection and Maintenance Check Lists
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LID Manual Input Process Workshops
Engage key players January 2010 solicited initial input
on first draft
Charrette Exercise September 2010 Charrette Exercise using two
CIP projects to validate the manual steps
Coordinated with individual departments Incorporated Changes
Based on Feedback
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Questions?