The Crossing Commons development is a large, multi-family residential housing complex on the south side of Coralville in Iowa. Early in the planning process, the developer sought the expertise of Impact7G to prepare a plan for managing stormwater runoff through “green infrastructure” best management practices (BMPs).

In addition to a comprehensive hydrologic review of the site, Impact7G worked with the developer to design two bioretention cells and a wet swale with drop structures. These stormwater BMPs provide a multitude of benefits including wildlife habitat, increase stormwater runoff infiltration and purification, improved aesthetics for residents, and reduced localized flash flooding. Impact7G led oversight for construction of the BMPs. Staff verified that construction specifications aligned with design standards, seedbed preparations were suitable, and that native plants were installed in accordance with planting plan.