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6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
6 bowling green ksa presentation
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6 bowling green ksa presentation

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  • 1. City of Bowling Green<br />Implementation of MCM 5<br />Post Construction<br />Matt Powell<br />
  • 2. Agenda<br />History -Regulatory Background<br />Goals<br />Program Development<br />Documentation<br />New BMPs<br />
  • 3. Program development<br />
  • 4. Bowling Green’s SW Goals<br />Improve the quality of Bowling Green and Warren County’s water resources by:<br />Implementing minimum control measures <br />Providing education to citizens<br />Provide protection of the short-term and long-term public health, safety, and general welfare by:<br />Protecting, and preserving storm water quality and fish and wildlife habitat within Bowling Green. <br />Protecting those downstream from stormwater quality impairment.<br />
  • 5. Defining the Program<br />Determine Pollutant of Concern (POC)<br />Establish Pollutant Load Reduction<br />Develop design requirements that encourage green infrastructure<br />Provide a selection of appropriate BMPs<br />
  • 6. Maximum Extent Practicable<br />To what degree must we implement this minimum control measure and achieve both compliance and unhindered growth and development?<br />Establishment of a second trigger; 10,000ft2<br />
  • 7. Hot Spot Landuses<br />Pretreatment required for following landuses:<br />Automotive Fueling Facilities<br />Automotive Repair Facilities<br />Restaurants with grease collection and disposal<br />Other landuses as determined to have a high potential of pollutant discharge into the MS4 as determined by the City Engineer<br />Typically, oil grease separators, hydrodynamic separators, etc.<br />
  • 8. Conservation Subdivision<br />WQMP = <br />Clearly defined clearing limits<br />Total impervious surfaces for development cannot exceed 15%<br />Minimum lot sizes – 1 acre<br />Disconnected roof drains<br />Stabilized sinkhole basins<br />No additional WQ treatment required<br />
  • 9. Sediment or total suspended solids (TSS)<br />Available BMP research<br />Many other programs using TSS as pollutant of concern<br />Old KYR100000– references 80% TSS reduction<br />Indicator pollutant<br />EPA has stated sediment is no. 1 reason for stream impairment<br />Pollutant of Concern<br />
  • 10. The Presumptive Program<br />The design is as described in BMP Manual<br />+<br />The installation is per the approved plans <br />+<br />The BMP is maintained per the Operation & Maintenance Plan<br />=<br />Compliance.<br />No Performance testing for preapproved BMPs<br />
  • 11. Steps Taken to Date:<br />Ordinance with post construction language<br />BMP storm water stakeholder group<br />BMP Manual revised<br />Ordinance revised<br />Developed plan review and permitting processes<br />Training<br />
  • 12. Never Again<br />Effective date = April 1 2008<br />If plan has been platted and has approved SWMP, no additional storm water quality treatment required.(The Grandfather Clause)<br />
  • 13. Documentation<br />
  • 14. Asbuilt Certification<br />Need to verify <br />That BMP was installed per approved plans<br />That WQv treatment goals being met<br />Engineer and surveyor<br />Asbuilt must be approved before:<br />Bonds released (S/D)<br />CO issued (non-S/D)<br />
  • 15. O&M Plan<br />Includes the following:<br />BMP Maintenance Agreement<br />Privately owned BMPs only<br />BMP location map<br />BMP schematics <br />BMP maintenance and inspection templates<br />Annual BMP report template<br />Recorded with the deed<br />Privately owned BMPs only<br />O&M Plan<br />The Landings<br />- Agreement<br />- Location map<br />- Schematics<br />- Inspection checklists<br />
  • 16. Maintenance<br />City to maintain BMPs in <br />residential areas<br />on public ROWs <br />Landowner to maintain all other BMPs<br />All BMPs<br />O&M Plan<br />Routine inspections<br />Annual inspection certification<br />
  • 17. A Tale of 2 Methods<br />Volume Based BMPs Calculation<br />WQv = [(P Rv)(A)]/12<br />Where,<br />WQv is the water quality treatment volume (ac-ft)<br />P is the average rainfall in inches, (in the case of Bowling Green, is 1.1 inches);<br />Rv is the volumetric runoff coefficient, which is:<br />Rv = 0.05 + 0.009(I), where I is the percent impervious cover;<br />and A is the area in acres<br />
  • 18. Manufactured BMPs<br />Treatment mechanisms different from non-manufactured BMPs<br />Must provide 3rd party testing to verify pollutant removal to get approved for use (TARP, NJCAT)<br />Nashville’s list of approved BMPs and reduction capabilities is automatically approved<br />
  • 19. Method 2<br />Rate Based BMPs Method <br />Qp=C I A<br />Where<br />Qp=unit peak flow in cfs<br />C=runoff coefficient<br />I=intensity, 2.45 inch per hour<br />A=contributing area in acres<br />Automatic 50% credit<br />
  • 20. Modification of Rate Based Method<br />Rate Based BMPs Method <br />Use of TR55 to determine Tc<br />Using synthetic storm curve Tc is used to determine I<br />I declines as Tc increases, thus encouraging green space by reducing the size of the unit required.<br />
  • 21. Treatment Train<br />Bioretention<br />80% TSS<br />Dry Detention<br />60% TSS<br />Flow<br />Flow<br />When one BMP discharges into another<br />Discharge from upstream BMP will be “clean” so downstream BMP TSS reduction will be less effective<br />TSS reduction = 80+60 – (80x60)/100 = 92%<br />
  • 22. BMP Selection<br />
  • 23. Ponds<br />Dry ponds<br />Outlet structure<br />Dry storage area<br />60% TSS reduction<br />
  • 24. Ponds<br />Wet ponds<br />Outlet structure<br />Permanent pool<br />80% TSS reduction <br />
  • 25. Ponds<br />Variations<br />Micropool<br />Extended detention<br />Multiple ponds<br />Pocket ponds<br />
  • 26. Wetlands<br />Outlet structure<br />Shallow wet treatment area<br />Upland dry storage<br />Plants are key<br />Length of flow (residence time) key<br />75% TSS reduction<br />
  • 27. Bioretention areas<br />Outlet structure<br />Small storm & large storms<br />Dry treatment area<br />Depressed planting area<br />Specific soils<br />Under drain<br />80% TSS reduction<br />
  • 28. Open Channel Systems<br />Simple outlet system<br />Treatment area<br />Dry <br />good in most all land use applications<br />Underdrain system<br />Wet <br />Not well accepted in residential<br />Long wetland<br />
  • 29. Sand filters<br />Many variations<br />Best suited for non-residential<br />Typically underground<br />Must receive drainage from only impervious surfaces<br />
  • 30. Infiltration trenches<br />Limited application due to karst topography<br />
  • 31. Questions and Discussion<br />Matt Powell<br />City of Bowling Green<br />matt.powell@bgky.org<br />

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