Improved Practices for Determining the Infiltration Characteristics of Soils for Design of Stormwater BMPs

Soil infiltration test results are utilized by Design personnel to assess the suitability of a site for various stormwater best management practices (BMPs). With the recent issuance of EPA’s final Municipal Separate Storm Sewer System (MS4) permit rules, the need for such testing is expected to increase. Current practice uses a variation of the borehole infiltration test prescribed in the NHDES Alteration of Terrain (AoT) rules using conventional drilling equipment in order to estimate infiltration rates. Testing protocols are time consuming and inefficient (approximately 4 hours per test interval), particularly when multiple sites or depths must be tested. The proposed research will evaluate alternative methods for determining the infiltration rate of soils at potential BMP sites including side-by-side comparisons with current test protocols as well as calibration with grain-size analyses and permeability water tests performed in the laboratory. Appropriate formulas for converting field results to design infiltration rates compatible with AoT rules will also be developed.

Language

  • English

Project

  • Status: Proposed
  • Funding: $100,000
  • Contract Numbers:

    26962U

  • Sponsor Organizations:

    New Hampshire Department of Transportation

    John O. Morton Building
    P.O. Box 483
    Concord, NH  United States  03302-0483
  • Managing Organizations:

    New Hampshire Department of Transportation

    John O. Morton Building
    P.O. Box 483
    Concord, NH  United States  03302-0483
  • Project Managers:

    Scholz, Ann

  • Performing Organizations:

    University of New Hampshire, Durham

    Department of Civil Engineering
    Durham, NH  United States  03824
  • Principal Investigators:

    Benoit, Jean

  • Start Date: 20190501
  • Expected Completion Date: 20201231
  • Actual Completion Date: 20210630

Subject/Index Terms

  • TRT Terms: Infiltration
  • Subject Areas: I15: Environment; I51: Earthworks and Soil Drainage;

Filing Info

  • Accession Number: 01686173
  • Record Type: Research project
  • Source Agency: New Hampshire Department of Transportation
  • Contract Numbers: 26962U
  • Files: RiP, STATEDOT
  • Created Date: Nov 20 2018 8:52AM