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Statewide Stormwater Treatment Draft Rule 62-347

The Statewide Stormwater Treatment Draft Rule 62-347 aims to improve water quality by increasing nutrient removal, establishing requirements for discharges to impaired waters, and promoting low impact design and retrofitting. It introduces performance standards for erosion and sediment control and retains sediment on-site. The rule updates best management practices (BMPs) and allows for BMP Treatment Train credits. Concerns for the mosquito control industry include increased breeding habitat and the need for routine inspections and maintenance of larger systems. BMPs include retention basins, underground storage and retention systems, swales, pervious pavement, green roofs, and wetlands.

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Statewide Stormwater Treatment Draft Rule 62-347

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  1. Statewide Stormwater Treatment Draft Rule 62-347 Steve Harrison, Environmental Manager Bureau of Entomology and Pest Control -Mosquito Control Section

  2. 62-347 —Stormwater Quality Rule • (Effective on or after July 1, 2011) • 62-347.010 • (1)-Stormwater treatment quality only; not quantity • -Does not replace current permit requirements; only changes treatment and design criteria • (2)-Incorporates by reference Stormwater Quality • Applicant’s Handbook • -Identification of rules of Water Management Districts (WMDs) that are superseded (likely to be moved to WMD rules) • (3)Does not affect agriculture or silviculture

  3. NEW RULE OBJECTIVES • Increase nutrient removal • Establish requirements for discharges to impaired waters • Statewide consistency • Update BMP design criteria • Allow BMP Treatment Train credits • Encourage low impact design • Encourage retrofitting

  4. PERFORMANCE STANDARDS

  5. Performance Standard for • Stormwater Discharges (62-40, F.A.C.) • Erosion and sediment control • Retain sediment on-site • Not violate turbidity standard • Stormwater quality – Original 1982 • 80% average annual load reduction • 95% average annual load reduction** • “Of Total Suspended Solids” • Stormwater quality –1990 • 80% average annual load reduction • 95% average annual load reduction** • “Of pollutants that cause or contribute” ** 95% for OFW’s (Outstanding Florida Waters)

  6. Problems with “Old Way” • WMD’s were allowed to adopt their own BMP design criteria – resulted in varying degrees of treatments throughout the state • Nutrient (mainly Nitrogen and Phosphorous) enrichment has increased in surface and ground waters • BMPs were never updated to adequately deal with nutrient removal • Research shows that current design and performance criteria do not properly address nutrient loadings from typical stormwater runoff conditions (Example: Wet Detention = 43% Nitrogen removal)

  7. Caloosahatchee River October 15, 2005 June 6, 2008

  8. Solutions • Unified Stormwater Treatment Rule (Draft Rule 62-347) • Update BMPs to meet new standards (New Stormwater Quality Handbook referenced in 62-347) • Utilize BMP Treatment Trains to achieve adequate treatment • Give credit for Low Impact Design

  9. BEST MANAGEMENT PRACTICES (BMPs) • Three basic types: • Retention BMPs: treatment volume is recovered through percolation into the soil • Detention BMPs: detain stormwater and discharge it at a specified rate • Source Control BMPs: nonstructural BMPs that are used to either minimize the amount of stormwater generated or minimize the amount of pollutants getting into the stormwater

  10. Retention Basins Underground Storage and retention Systems Underground Retention Vault/Chamber Swales Vegetated Natural Buffers Pervious Pavement Green Roof/Cistern System Wet Detention System Managed Aquatic Plant System Stormwater Harvesting Wetland Stormwater Treatment Train Underdrain Filtration Chemical Treatments Low Impact Designs Specific BMPs

  11. Concerns for Mosquito Control Industry? • Increase in mosquito breeding habitat? • Routine inspections? • Larger systems? • Maintenance of systems?

  12. Retention BMPs

  13. Detention BMPs

  14. Source Control BMPs • Natural Area Conservation • Site Reforestation • Disconnecting Directly Connected Impervious Areas • Florida-friendly landscaping • Rural subdivisions

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