Sioux Falls expands green infrastructure to reduce flooding and improve water quality

The City of Sioux Falls has completed two new green infrastructure projects designed to reduce localized flooding and improve stormwater quality through the use of rain gardens and bioretention systems.

Located at West 28th Street and South Covell Avenue and at West 35th Street and Duluth Avenue, the projects are part of the city’s Green Infrastructure Improvement Project, which has been installing nature-based stormwater management features since 2021. City officials selected the sites based on existing green space and drainage challenges in areas prone to flooding during heavy rainfall.

The systems are designed to capture stormwater near where it falls, allowing runoff to infiltrate into the ground rather than flow directly into storm sewers. During rain events, the bioretention cells filter pollutants such as sediment, oil and excess nutrients, helping protect local waterways while reducing strain on drainage infrastructure.

According to the city, the installations require approximately three growing seasons to reach full effectiveness. The projects use specially engineered soils, native vegetation and shallow collection areas to naturally manage rainfall and improve infiltration.

Sioux Falls officials said the projects demonstrate how green infrastructure can complement traditional stormwater systems while providing additional environmental benefits. Native South Dakota plant species incorporated into the sites require less maintenance than conventional turfgrass and create habitat for pollinators and other wildlife.

Educational signage and accessible pathways were also included to help residents learn about stormwater management practices and the role green infrastructure can play in reducing flooding and improving water quality. The city views the projects as models for future stormwater management efforts as communities seek resilient solutions to increasing rainfall and runoff challenges.