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New Bioretention Standards
1. Construction Site Permitting and
New Bioretention Standards
Chris Cotton
Stormwater Program Coordinator
Ohio EPA – Southwest District Office
Christopher.cotton @ epa.ohio.gov
937.285.6442
2. OEPA’s Construction General PermitOEPA’s Construction General Permit
Revised every 5 yearsRevised every 5 years
ESC at active construction sites, andESC at active construction sites, and
Proper mgmt of materials, wasteProper mgmt of materials, waste
““Post-construction” runoff mgmt toPost-construction” runoff mgmt to
Improve water qualityImprove water quality
Protect stream stability/functionProtect stream stability/function
3. Post-ConstructionPost-Construction & the& the
“Water Quality Volume”“Water Quality Volume” (p 18 of CGP)(p 18 of CGP)
WQv = C x P x A/12WQv = C x P x A/12 C = runoff coefficientC = runoff coefficient
P = 0.75 inches of rainP = 0.75 inches of rain
A = area draining to BMPA = area draining to BMP
-- BMPs listed in permit (p 21)-- BMPs listed in permit (p 21)
-- Alternative BMPs => OEPA approval
4. Bioretention as Post-con BMPBioretention as Post-con BMP
• Size to handle all (or part) of a siteSize to handle all (or part) of a site
•
• 24 hour draindown24 hour draindown
•
• Rain gardens not considered bioretentionRain gardens not considered bioretention
• Lack specific design standardsLack specific design standards
• Rain gardens typically smallRain gardens typically small
• Better suited for retrofitsBetter suited for retrofits
