Water Resources Center
OSTP

The Water Resources Center is affiliated with the College of Food, Agricultural and Natural Resource Sciences and University of Minnesota Extension.

Floodplain Areas

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Systems in floodplain areas are usually associated with existing structures as new construction would be prohibited in the floodplain. An existing structure
in a floodplain with a failing system may need a replacement system.

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A septic system located in a floodplain.

The concerns about floodplain areas during flood events include surface water contamination and system damage by fine soil particles contained in the flood waters.  A system cannot be located in the floodway but may be sited in the Flood Fringe as shown in Figure 2.13.


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Figure 2.13 Floodplain Profile

For more information about building systems in Floodplain areas see Sections 2 and 4 of the Manual for Septic System Professionals in Minnesota.