Roadside infiltration facilities like wet ponds and swales have been used for more than 30 years to filter roadway contaminants from stormwater runoff, but they have a high rate of failure due to inaccurate determination of soil infiltration rates.Continue reading New Tools and Protocols for Successful Infiltration Facilities
Assisted by many county agency staff, researchers collected and analyzed runoff from low-volume rural roads over two years to determine how their contaminants compared to those of high-volume roadways. Results documented that runoff from low-volume roads has a lower contaminant concentration and that ditches and swales can be used to effectively treat rural road runoff.Continue reading Low-Volume Road Runoff Analyses Suggest Optimal Treatments
A recent study determined the effectiveness of a two-cell iron-enhanced stormwater filtration basin to remove phosphorus from highway stormwater runoff collected from 2012 to 2018. Researchers recommended design changes that would allow for more accurate monitoring of these filter basins.Continue reading Monitoring Performance of an Iron-Enhanced Stormwater Filtration System
This article was originally published in Catalyst, April 2020.
The Minnesota Department of Transportation (MnDOT) is exploring innovative ways to filter pollutants from stormwater runoff and meet permit requirements for construction projects. In a recent study, U of M researchers documented the performance of an iron-enhanced ditch check filter to remove phosphates from stormwater. They found that the filter was effective, though its performance decreased over time.Continue reading Redesigned iron-enhanced ditch checks could help filter pollutants from stormwater runoff
Researchers determined that natural soil amended with locally sourced materials performed well in bioslopes and bioswales. This practice will allow MnDOT to avoid hauling in costly commercial materials for stormwater management installations.Continue reading Using Regional Materials to Manage Stormwater Runoff