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Nonstructural Flood Risk Reduction for the Red River of the North

This assessment investigates the feasibility of implementing nonstructural measures downstream from the proposed diversion channel in Fargo and Moorhead. Over 3,800 structures were evaluated for a least-cost approach to nonstructural measures. Results show that 35% of structures qualify for nonstructural mitigation, including ring levees and elevation techniques.

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Nonstructural Flood Risk Reduction for the Red River of the North

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  1. Nonstructural Flood Risk Reduction Considerations for the Red River of the North

  2. Nonstructural Assessment of: * Stand-Alone Project for Fargo and Moorhead * Area Downstream from Proposed Diversion Channel

  3. Hydrologic Data Development

  4. Structure Data Collected for Assessment • Location/Address • Hydraulic Stream Station • Structure Type • Structure Value • Content Value • First Floor Elevation • Adjacent Ground Elevation • Depth of Flooding • Velocity of Flooding • Associated Flood Damages • Construction Material

  5. Stand-Alone Assessment Facts: Develop Plans for the 100-, 200-, and 500-Year flood events 9,644 Structures Individually Evaluated Structure Types - Residential, Commercial, Public, Critical Facilities Measures Must Be Feasible to Implement (positive BCR)

  6. Nonstructural Stand-Alone Assessment

  7. Nonstructural Assessment Economic Sub-Areas (5)

  8. Nonstructural Stand-Alone Plan Assessment

  9. 100-Year Stand-Alone Nonstructural Plan Results

  10. Area Downstream from Diversion Channel Facts: Develop Plans for the Least Cost 100-Year Flood Event 3,801 Structures Individually Evaluated Structure Types - Residential, Commercial, Public, Critical, Agricultural Measures Must Be Feasible to Implement (positive BCR)

  11. Nonstructural Downstream Assessment

  12. Nonstructural Downstream Assessment Economic Sub-Areas (6)

  13. The approach to this investigation was to determine the potential for implementing nonstructural measures downstream from the Fargo-Moorhead Metro area, outside of the influence of the proposed diversion channel project. The study area was widespread taking in parts of 6 counties, 3 in Minnesota and 3 in North Dakota. Over 3,800 structures were investigated, first, for being impacted by a flood event equal to or greater than a 100-year event, and secondly, for a least-cost approach to implementing nonstructural measures. While the study area consisted on many residential and commercial structure types, there were also numerous barns, machine sheds, grain bins, and silos. These structures are more common to rural areas, where agriculture is the leading industry. For these structure types, nonstructural techniques of elevating the structure, elevating a false interior floor, wet flood proofing, or dry flood proofing was considered. In many instances where farmsteads were identified, the structure types consisted of residential, barn, sheds, bins, and silos. Where practical, groups of structures were protected by ringing the perimeter of such groups of structures with earthen berms. Since the berms are not meant to meet FEMA levee accreditation standards, they were identified as a nonstructural measure but would not qualify to meet government levee standards. Of the 1,117 structures assessed in detail, 395 or 35% of the structures were found to be qualified for nonstructural mitigation. Many of the 395 examples consist of ring levees where more than one structure is being protected from flooding. Numerous worksheets were developed for this investigation and contain the individual structure and groupings of structures. Since the floodplain is characteristically flat, there were no geographical subareas within which to subdivide into smaller economic units. This is why political boundaries, divided along county lines, were used to subdivide the total study area.

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