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Presented at: Phase II Storm Water Planning Meeting January 23, 2014 PowerPoint Presentation
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Residential BMP Program Update. Presented at: Phase II Storm Water Planning Meeting January 23, 2014. Residential BMP Program History 2005 – A Phase II Storm Water permit issued by NC required Towns to implement a Post-Construction ordinance that provided for BMP Maintenance

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Presentation Transcript
slide1

Residential BMP Program Update

Presented at:

Phase II Storm Water Planning Meeting

January 23, 2014

slide2

Residential BMP Program History

  • 2005 – A Phase II Storm Water permit issued by NC required Towns to implement a Post-Construction ordinance that provided for BMP Maintenance
  • 2006 – Post-Construction Stakeholders Group developed a Model Ordinance which included Jurisdictions providing BMP maintenance for single-family residential BMPs subject to Post-Construction because:
      • HOAs are not equipped to perform BMP maintenance.
      • HOAs could not afford to replace an improperly- maintained BMP
      • Most residential BMPs receive public water from Town-maintained roadways.
slide3

Residential BMP Program History

  • 2007–The City, County, and Towns approved Post-Construction ordinances that included residential BMP Maintenance by the Jurisdiction with the exception of Cornelius and Huntersville
  • 2009 – County provided some funding estimates for Towns to maintain and replace single-family residential BMPs
  • Today – County will provide updated BMP funding estimates for future single-family residential development for all jurisdictions
slide4

Residential BMP Program Funding Process

  • Identify underdeveloped single-family residential properties
    • Used Parcel ID layer information from POLARIS
    • Did not include parcels without designated land uses
    • Assumed undeveloped parcels would be Tier II and R3 density
slide5

Residential BMP Program Funding Process

Separated parcels within Town limits and those in ETJ Areas

slide6

Residential BMP Program Funding Process

  • Estimated BMP Costs
    • Constant growth over a 50-year build-out period
    • Used 3.8% construction inflation (based upon past 10 years)
    • All residential development would require BMPs
slide7

Residential BMP Program Funding Process

  • Estimated BMP Maintenance & Replacement Costs
    • BMP useful life of 20 years
    • Replacement Costs are 55% of construction cost.
    • Maintenance Costs are based upon a nation-wide study including NC
slide8

Residential BMP Program Funding Process

Estimated BMP Funding Within Town Limits and ETJ Areas

slide9

Residential BMP Program Funding Process

  • Estimated Minor System Fee Increase Needed to Fund BMP Program
    • Minor System Fee increases for all fee payers (commercial & residential)
    • Tier II equivalent rate shown below
    • Includes additional fee payers each year
slide10

Charlotte-Mecklenburg Schools Estimated BMP Maintenance Costs

Estimated Annual BMP Maintenance Cost for 122 CMS BMPs is $394,000 /yr (~$3,400 /BMP/yr)

slide11

Central Piedmont Community College Estimated BMP Maintenance Costs

Estimated Annual BMP Maintenance Cost for 14 CPCC BMPs is $34,000 /yr (~$2,400 /BMP/yr)

slide12

BMPs on Single-Family Lots

  • Oct. 2012 – NC began allowing partial built-upon area (BUA) credit for permeable pavement
  • Jul. 2013 – Charlotte-Mecklenburg allowed same BUA credit for permeable pavement when used as a BMP with exception of Watershed Caps
  • Nov/Dec 2013 – CMSWS contacted all Towns to determine if Towns wanted to allow permeable pavement (and BMPs in general) on single-family lots due to the additional complications of managing BMPs on private single-family residential lots.
slide13

BMPs on Single-Family Lots

  • In general, Towns were in favor of not allowing BMPs on single-family residential lots but were in favor of allowing optional mitigation.
slide14

Process Forward

  • For maintenance of single-family BMPs, planning for staffing (or outsourcing) should begin as development increases
  • Perform regular maintenance of BMPs to extend the useful life and reduce future costs
  • Actual BMP construction and maintenance costs should be collected to refine the modeled costs.
  • Estimated BMP Program costs should be re-modeled in 5 years
  • Pursue changes to Manuals to prohibit BMPs on single-family lots