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From the From the BeginningBeginning
Design Standards and Other Post-Construction Program
Elements
Post-Construction BMPsPost-Construction BMPs
Long term BMPs that help protect runoff throughout the life of the
completed project
Impervious AreaImpervious Area
• More runoff, More Pollutants
Post Construction GoalsPost Construction Goals
Water Quality Goals
– Reduce impervious area
– Limit pollutant exposure
– Diminish pollutant transport
Program Goals– Process to
ensure that “Water Quality Goals” are met
ProgramProgram
• Ordinance requiring developers to incorporate post construction BMPs
• Strategy of BMPs • Enforcement of ordinance• Long-term operation and
maintenance of BMPs
OrdinanceOrdinance
• Model Ordinance– www.stormwatercenter.net– Model Urban Runoff Program
• Reference to separate document
BMP StrategyBMP Strategy• Site and watershed conditions
– constraints– topography– areas to utilize
• Pollutants of concern– 303(d) list– pollutants expected to be present
• Options• Sizing
BMPsBMPs
Site Design
Source Control
Treatment
Site DesignSite Design
• Minimize building footprint• Cluster development (leaving more
useful open space)• Minimize directly connected
impervious areas (DCIA) – direct roof downspouts to landscape areas
• Protect slopes and channels• Aquatic buffers
Source ControlSource Control
• Outdoor material storage areas• Trash enclosures• Equipment wash areas
TreatmentTreatment
• Vegetated swales• Detention basins• Constructed wetlands
RequirementsRequirements
• Attachment 4 - Design Standards
• Conserve Natural Areas
• Limit Directly Connected Impervious Area
• Parking Lots
• Restaurants• Retail Gasoline
Outlets• Vehicle
Equipment Wash Areas
• Storage Volume • Treatment Flow
EnforcementEnforcement
• Site Plan Review– Checklist
• Site Inspection– As part of final approval
MaintenanceMaintenance
• Legal agreements• Conditional use permits• Homeowner’s association• Conditions, covenants, and
restrictions• Databases• Inspections checklists