Post-Construction Requirements Design Challenges Dan Cloak, P.E.
Transcript of Post-Construction Requirements Design Challenges Dan Cloak, P.E.
Topics
• Low Impact Development Site Design– Design philosophy (what and why)– Benefits and some drawbacks
• Challenges to Achieving LID Site Design– Space constraints– Geotechnical and foundation design– Soil permeability– Groundwater
LID: What
• Preserve and replicate natural site hydrology
• Detain and retain runoff throughout the site
LID: Why?
• Why? Resilience.– Community engagement
and acceptance– Education and awareness– Habitat– Temperature moderation– Air quality– Most robust and effective treatment– Hydrologic control
LID: Challenges
• More facilities to build, maintain, and inspect
• Higher costs • More structural elements
(sidewalls, overflows)• More design effort
– Integration with buildings, parking, and circulation
Design Challenges and Solutions
• Space constraints– Integrate LID at earliest stages of design
• Geotechnical and foundation design– Modify and enhance structures
• Low permeability of soils• Groundwater
Space Constraints
• Solution: Incorporate site drainage and Stormwater Control Measures in preliminary site plan
Require Stormwater Plan Early
Pre-ApplicationMeeting
CompletedApplication
“DeemedComplete”
SectionReview
CEQAReview
Conditions ofApproval
Planning Commission
DetailedDesign
Plan Set and Permit
ApplicationConstruction
Strategies to Minimize Facility Size
• Minimize impervious area• Make landscaped areas self-treating or
self-retaining• Disperse runoff to landscape