Edison Parking Lot Project
In 2013 the Mississippi Watershed Management Organization (MWMO) funded a complete renovation of the Edison High School parking lot. The purpose of the renovation was to install innovative stormwater recapture infrastructure to ensure that the parking lot could manage the water generated by a 4” rain event by retaining it onsite rather than allowing it to enter the storm sewer system and, ultimately, the Mississippi River.
The stormwater infrastructure incorporated into the parking lot includes a Swedish tree trench down the center of the lot. Tree trenches use a combination of non-compacted soils and rock to create an environment that can more efficiently absorb rainwater and that promotes healthier tree growth within an urban setting. The addition of trees also counteracts the heat island effect.
The south end of the parking lot is paved in permeable material with a 4 foot underground storage tank underneath. That infrastructure allows the area to absorb and process stormwater. A biofiltration swale has also been installed at the southwest corner of the lot. This is a modified raingarden specifically designed to capture stormwater coming from the alley.
Water monitoring equipment was installed in the biofiltration swale in the early spring of 2015, allowing for ongoing analysis of both the volume and the quality of the water that is passing through the parking lot's Swedish tree trench. Stantec, the engineering firm that undertook the parking lot renovation, provided the grant funds for the water monitoring equipment, as well as for paid internships for the students doing the actual monitoring. The monitoring is bening overseen by Dr. Bruce Wilson, a professor of Biosystems and Agricultural Engineering at the University of Minnesota. Dr. Wilson’s work focuses on erosion mechanics and hydrologic/water quality processes of watersheds.
Last updated Sep 14, 2015