Analyzing a Development Site
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Transcript of Analyzing a Development Site
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Analyzing a Development Site
for Low Impact Development design
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LID Design Guide
Analyze your project● Select LID options
Design site and document drainage● Show how criteria are met
Specify preliminary design details● Integrate LID with paving and landscaping
Iterate
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LID Design Guide
Analyze your project● Select LID options
Design site and document drainage● Show how criteria are met
Specify preliminary design details● Integrate LID with paving and landscaping
Iterate
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Strategies, Applicability, Design
Optimize the site layout Use pervious surfaces Disperse runoff Store runoff and use it later Use bioretention (or other facilities)
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Optimize the Site Layout
Protect Watercourses and DrainagePreserve Open SpaceCluster BuildingsMinimize Pavement WidthsMinimize Parking
APPL
ICAB
ILIT
Y
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Expensive to buildDurability and maintenance issuesBest for:● Flat sites with limited access to drainage• No need for drainage pipes or structures
● On well-drained, competent soils●Where traffic is limited● For aesthetic reasons● To avoid thresholds
Pervious PavementAP
PLIC
ABIL
ITY
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Pervious Pavement Design IssuesSubgrade ● No compaction or minimal compaction● Captures and holds runoff at interface● Avoid surfacing of runoff
No subdrain● Or minimum 3 inches above soil
APPL
ICAB
ILIT
Y
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Extensive flat, landscaped areas● Next to buildings● Downgradient from paved areas
Impervious:Pervious ratios● 2:1 if treatment only criteria apply● 1:1 if flow-control (hydromodification
management) criteria apply
Disperse RunoffAP
PLIC
ABIL
ITY
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Harvesting and Reuse
Where there is an industrial demand for non-potable water● Concrete plants●Washing
Projects emphasizing water conservation and sustainability● LEED certification
Where there is intense occupancy and good facility management● High rises● Public facilities
APPL
ICAB
ILIT
Y
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Bioretention
Applicable to nearly any development site
Can reliably treat and manage runoff in small footprint
Achieves some infiltration and evapotranspiration
Flow-through planter can be used if infiltration is infeasibleAPPL
ICAB
ILIT
Y
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Example Development Site
Thanks to:Signature Propertiesdk ConsultingCity of Lafayette
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Opportunities and ConstraintsD
ESIG
N
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Opportunities and ConstraintsD
ESIG
N1%
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Opportunities and Constraints
Fill 8.5 to 15 feet deepSilty clay to clayey sand (Group “D”)
DES
IGN
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Opportunities and Constraints
Densely developed townhome project
DES
IGN
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Opportunities and Constraints
Landscaped areas around buildings and central plaza/green space
DES
IGN
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Applying the StrategiesD
ESIG
N Optimize the site layout Use pervious surfaces Disperse runoff Store runoff
and use it later Use bioretention
(or other facilities)