Reinforced Soil Structure for Stream Bank Restoration Project in U.S.A

This will be a case history presentation on a real stream restoration projects in Delta, WI, USA.
The project site experienced severe erosion where flooding cut a channel over 8 feet deep into previously unaffected soils during a rain event.
A mix of engineering solution was implemented, in particular a vegetated reinforced soil system to perfectly blend into the environment.

Full Abstract: Problem: the project site experienced severe erosion where flooding cut a channel over 8 feet deep into previously unaffected soils during a rain event in 2018. The erosion exposed an outdated solid waste landfill that posed environmental contamination concerns. The liner cap of the landfill was significantly uncovered as evident on the left side of the channel looking upstream.
The rain event, estimated to be greater than the 100-year storm event for the region, caused a lake higher in the watershed area to overtop the nearby road. The landfill exposure resulted in the contamination of water bodies downstream from the project site. The area around the site
has many smaller recreational lakes lower in the watershed area that were a concern for any further contaminant from the exposed landfill.
The ownership entity, Bayfield County, worked with the Federal Emergency Management Agency (FEMA) in order to find a solution to stabilize and armor the channel to eliminate the future risk of further contamination that could be caused by future rain events.
Solution: the project required erosion control and soil stabilization elements for the channel, as well as further protection and vegetation
establishment for the regraded slopes above the channel.
As will be showed in the presentation with a cross-section (Schematic.), many different systems were involved in the final solution: Revet
Mattresses, Mechanically Stabilized Earth structures, Erosion Control blankets, and drainage geocomposites.
The project is located in Delta, WI, United States of America. During the presentation the presenter will show pictures of pre-construction eroded channel, during and final construction solution looking upstream and downstream.