Stormwater Management Master Plan - MSD

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Stormwater Management Master PlanA minimum buffer is also required by the KDOW through its Kentucky Pollutant DischargeElimination System (KPDES) General Permit For Stormwater Discharges Associated WithConstruction Activities (KYR10). A minimum 25 foot buffer is required for discharges towaters categorized as High Quality or Impaired Water (Non-construction related impairment). Aminimum 50 foot buffer is required for discharges to waters categorized as Impaired Waters(Sediment impaired, but no TMDL).In order to promote enhanced water quality and aquatic habitat, natural channel designtechniques are the preferred method for the design of streams. Channel improvement projects inblueline streams are required to use natural or “soft” approaches. MSD’s Design Manualoutlines natural channel design requirements in Section 10.3.6.Green infrastructure and post-construction requirements for new development are currentlyunder development and are anticipated to be required as part of the MS4 Permit in late2011/2012. One aspect of these anticipated requirements that will benefit the stormwatermanagement program is the application of a water quality volume requirement. It is anticipatedthat the first 0.75 inches of the 80% stormwater runoff event will be required to be infiltrated,treated, or otherwise managed for new development projects.The Louisville/Jefferson County Erosion Prevention and Sediment Control Ordinance requiresdevelopments with 2000 square feet of disturbance and developments within 50 feet of asensitive feature as defined by the ordinance to obtain a Site Disturbance Permit. The SiteDisturbance Permit requires an EPSC plan to be developed which achieves 80% design removalof total suspended solids that are generated by the site. The design storm to be used is the 10-year 24 hour SCS Type II storm event.3.3.2 Proposed ProjectsOne combined sewer project, which is part of the IOAP, is proposed in the Muddy ForkBeargrass Creek Watershed. This project is the Clifton Heights Storage Basin. Moreinformation regarding this project can be found in Appendix A of this report and also in the FinalCSO Long-Term Control Plan document, which is part of MSD’s IOAP.Four green infrastructure projects are being considered in the Muddy Fork Beargrass CreekWatershed. For more information regarding green infrastructure projects, see Appendix B of thisreport and also the Final CSO Long-Term Control Plan document, which is part of MSD’sIOAP.Small scale drainage projects are taken care of through the program Project DRI. Beginning in2003, MSD initiated an aggressive program to address a wide variety of drainage issues that arebrought to us by our customers. This program, dubbed Project DRI (Drainage ResponseInitiative), assigned experienced project managers, contractors, and inspectors to addressdrainage problems on a "grade-to-drain" basis. Efforts under this program address problemsranging from structural flooding to alleviating minor standing water problems. Available fundsAugust 2010 Muddy Fork Beargrass Creek Page 4
Stormwater Management Master Planare distributed across the service area based on relative levels of customer concerns andestimated costs of repairs within geographic areas. Since 2003, MSD has spent over $125 millionin capital drainage improvements in our service area under the three phases of Project DRI.Phase 4 of Project DRI is scheduled to begin in July 2010. Projects lists for Phases 1-3 can befound in the Appendix C of this report. A final project list for Phase 4 is currently underdevelopment.August 2010 Muddy Fork Beargrass Creek Page 5
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Stormwater Management Master Plan - MSD

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