The City of Minneapolis designs flood control projects to minimize the impact on the water quality of the receiving surface water, as well as providing localized flooding relief. Since 1997, the City Of Minneapolis has completed 21 Flood Mitigation projects, and currently have a total of 11 additional projects that are slated for future construction.
Flood Mitigation Program
The 1997 torrential rainstorms in Minneapolis caused flooding in areas that had not flooded in many years. These large rainstorms did not allow City storm and sewer systems to keep up. Water backed up onto streets, into basements, lakes, rivers and creeks.
In response, the Minneapolis Flood Mitigation Program was created to lessen the effects of severe storms in the identified areas, and established the following actions:
- Construct additional detention basins and stormwater holding ponds.
- Construct new and upgrade existing storm drains.
- Replace existing storm drain grates with new ones designed to allow more water in.
- Construct additional storm drain inlets, so streets can drain quickly.
- Identify streets that experience flooding as a result of inadequate storm drain system capacity.
- Install back-up generators for existing pump stations.
- Increase inspection and maintenance of storm drain inlets and storm drains in flood-sensitive areas.
- Decrease property flooding caused by sanitary sewer back-ups by:
- Removing cross-connections between storm and sanitary systems.
- Reduce the volume and duration of ponding water during and after rainstorms.
- Replacing standard sanitary manhole covers in low areas with watertight sealed covers.
These measures also have the added benefit of reducing Combined Sewer Overflows - for more information see the Combined Sewer Overflows.
Last updated Jan 24, 2017