Flood mitigation program

Flood mitigation looks for the causes of flooding in specific areas, using modeling software to determine how to reduce or eliminate the possibility of flooding.

Heavy rain can cause urban flooding, and can happen far away from our bodies of water. Flooding can happen when:

  • The storm drain system is not big enough
  • There are not enough storm drains
  • There is not enough green space to help stormwater naturally soak into the ground

Each situation can be different, and depends on a number of factors. Flood mitigation looks for the causes of flooding in specific areas, using modeling software to determine how to reduce or eliminate the possibility of flooding.

In the past, flood mitigation projects have used these strategies to help prevent flooding:

  • Adding new storm drain inlets and pipes so streets can drain faster
  • Building stormwater holding ponds
  • Building green infrastructure such as rain gardens

Computer modeling has been completed on approximately 75% of the city. These models can further identify flood areas and determine where our future flood mitigation efforts should be. We also receive flooding complaints that help to identify areas prone to flooding. All of these efforts have resulted in increased inspection and maintenance of these areas.

2019 Flood Mitigation Study Areas

Hydrologic & Hydraulic Modeling Status  (Feb 2019)


The Southwest Harriet area in Minneapolis has had a history of flooding challenges during large rainfall events. Computer models showed many structures, streets and parks could be subject to future flooding due to lack of capacity in the storm sewer system. A flood mitigation feasibility study was completed to address these issues.

Southwest Harriet Flood Mitigation Study

Southwest Harriet Appendices

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