State-of-the-Practice Report: Stormwater BMP Maintenance and Operations

This Community of Practice (CoP) report includes an overview of the State-of-the-Practice for maintenance and operation of stormwater Best Management Practices (BMPs) to comply with MUNICIPAL SEPARATE STORM SEWER SYSTEM (MS4) National Pollutant Discharge Elimination System (NPDES) Permits for State Departments of Transportation (DOTs). BMPs are designed to reduce the discharge of pollutants from all regulated activities undertaken by the DOTs within their highway right-of-way and related facilities. Some BMPs also mitigate changes in hydrology associated with the development of highways and ancillary facilities. The objective of this report is to provide information on the state of the practice of stormwater BMP maintenance and operation for DOTs and provide information on the elements of an idealized DOT stormwater BMP maintenance and operation program. Information in this report was developed based on an internet survey sent to each of the state DOTs in the U.S. The survey investigated DOT practices for maintenance of stormwater assets, specifically treatment BMPs installed pursuant to compliance with the DOT’s NPDES Permit. This report provides an overview of the state of practice for stormwater BMP maintenance and recommends areas of future research to improve the stormwater maintenance program. The survey found that in general, DOT maintenance programs are based on regular inspections and correction of identified deficiencies. DOTs are challenged with available tools to prioritize maintenance and rate performance of BMPs in the field. Therefore, DOTs can consider varying inspection frequency to coincide with estimated need. Asset management planning is increasing as a tool among DOTs, including planning for stormwater assets. However, stormwater asset management plans are generally in the early stages of development, and maintenance cost information, particularly by BMP type, is generally not captured. Indeed, few DOTs are tracking maintenances costs for their stormwater programs. This information needs to be collected to allow DOTs to report NPDES compliance costs and forecast this rapidly increasing portion of the DOT budget. BMP maintenance costs also represent a substantial portion of the whole life cost for the BMP. Accurate maintenance costs will allow practitioners to select the least-cost, permit-compliant practice for each project, as well as reduce long term costs through design refinements.

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: Appendices;
  • Pagination: 25p

Subject/Index Terms

Filing Info

  • Accession Number: 01705772
  • Record Type: Publication
  • Files: TRIS, ATRI, USDOT
  • Created Date: Apr 22 2019 2:58PM