What is stormwater runoff? Stormwater runoff refers to rainwater or melted snow that runs off streets, lawns, roofs, driveways, and other surfaces where water cannot penetrate. Stormwater can drain into underground aquifers before eventually flowing into streams, rivers or other natural water bodies. However, urban areas such as the suburbs of Chicago, have more impermeable surfaces which prevents stormwater from naturally absorbing into the ground. This generates a higher volume of stormwater runoff and less opportunity for water to be absorbed naturally.
What problems might stormwater cause? Stormwater runoff is one of the leading threats to clean water. Stormwater can flow into and overwhelm drainage ditches and storm drains and cause overflows and flooding, stream bank erosion, damage and “wash out” to roads, sidewalks, and other infrastructure, destroy natural wildlife habitats, and contaminate streams, rivers, and other bodies of water.
Contamination can happen when precipitation flows over impervious areas and pick up pollutants such as litter and trash, oil, gas, and grease from roadways, fertilizers, bacteria, and other sediments that can be toxic on their own or when combined with other toxins.
What are the solutions for stormwater in urban developments? One successful solution is a stormwater detention system. These systems are designed to collect and store stormwater using a variety of methods to allow for a slower release into a municipality’s stormwater system. A lot of the urban ponds you see, especially near newer commercial developments or subdivisions are large versions of these systems. An underground detention system can be installed in instances with limited physical space. Other “green infrastructure” solutions can include rain gardens, detention basins or ponds, and dry wells.
Do I need a stormwater detention system? Many factors determine whether your specific residence or project will need a stormwater detention system. In the greater Chicago area specifically, there are certain ordinances in place that address stormwater management requirements including any necessary permits.
The Bono team has successfully designed various types of stormwater detention systems based on the unique characteristics and qualities of a project site, location, size, budget, and other criteria important to a project. Pictured below is the installation of a DryWell system as a stormwater management solution.
While we can’t prevent stormwater runoff from happening, it is our responsibility to uphold stormwater ordinances and requirements, maintain and manage stormwater detention systems, and help to prevent pollution, erosion, and other negative impacts.
Have more questions on stormwater management? Start here on our website: storm water management engineering.