Design and Construction of Infiltration Facilities

  • The Turf-Tec infiltrometer measures the infiltration rate of water into the soil.
  • A map of Anoka County Minnesota, shows soil areas differentiated by capacity to infiltrate water. Light lavender areas exhibit poor infiltration, while progressively darker areas represented moderate to good to excellent infiltration rates.
Status:  Complete
Report Date:  07/13/2021


MnDOT and local agencies control stormwater runoff from roadways through a range of settlement, filtration and infiltration facilities, such as wet ponds, infiltration basins, trenches and swales. Runoff infiltration facilities allow roadway contaminants to be filtered out before stormwater moves into the environment. Infiltration facilities have been used for more than 30 years, but a high rate of failure has been tied to inaccurate determination of soil infiltration rates. Researchers developed new tools and protocols to provide designers and engineers with the accurate infiltration measures they need, from initial site selection through construction. These tools and methods will support the development of successful stormwater infiltration facilities along Minnesota roadways.

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