Roseau River Flood Damage Reduction Project Roseau, Minnesota.

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Presentation transcript:

Roseau River Flood Damage Reduction Project Roseau, Minnesota

Roseau River Flood Damage Reduction Project Steps 1 & 2

Planning Objectives  PRIMARY OBJECTIVE – To define an implementable permanent flood damage reduction project that would significantly reduce the long-term risk of catastrophic flood damages to Roseau. Such a project needs to be technically feasible from engineering and economic perspectives. The NED plan may not be implementable because of its downstream effects; however, the recommended LPP plan would be implementable.  OBJECTIVE – An important study objective is that the recommended flood damage reduction plans need to fit into long-term regional flood damage reduction goals (long term a number of local and State sponsored plans are being pursued to reduce flooding throughout the Roseau River subbasin). The recommended plan fits with the regional flood damage reduction plans and could be complemented by the implementation of those plans. The local watershed district and city are pursuing plans to assist with drainage issues in the basin.

Planning Constraints  PLANNING CONSTRAINT – A key objective for the non- Federal sponsor is that the project would not induce damages to areas upstream or downstream of the study area and that damage to the “opposite side of the river” from any proposed project features would not occur or is minimized.  PLANNING CONSTRAINT – Poor riverbank and levee foundation stability are problems in the project area.  PLANNING CONSTRAINT – An environmental issue that could affect project design is the potential presence of hazardous, toxic, or radioactive waste (HTRW) materials.

Planning “Concerns”?  CONCERN – The project area could potentially have historically or culturally significant sites, which are common near riverbanks in the region.  CONCERN– Federally designated threatened species may have habitat in the project area.  CONCERN - Fish passage in the river is an important issue for many agencies involved in the coordination of this plan.

Local Concerns  LOCAL CONCERN – Citizens and city officials are concerned about the probable negative spiral effect that another major flood or floods would have on the community. Specifically, if a major flood breached the existing temporary levee system, many structures would be damaged to the point where they would need to be condemned and removed. Another traumatic flood event with damages at Roseau would be difficult to overcome. From social and economic perspectives, the concern is that future significant flood damages would significantly decrease available housing, decrease community and neighborhood cohesion, adversely affect local property value and the tax base, and likely result in a decline in the community population. It could also have adverse effects on regionally significant business, especially the Polaris plant in Roseau.

Planning Opportunities  OPPORTUNITY – To identify and analyze structures in and around the river that contribute to the flooding problems.  OPPORTUNITY – An opportunity to pursue recreation, ecosystem restoration, and aesthetic features in the project area exists.  OPPORTUNITY – The city of Roseau has fiscal and political support from the State of Minnesota, increasing the financial resources available for this plan.  OPPORTUNITY –This project would provide an opportunity to protect historically/culturally significant structures from high risk of flooding.  OPPORTUNITY – Establish or improve the riparian corridors along waterways (including ditches); encourage the use of native vegetation.

Roseau River Flood Damage Reduction Project S tep 3 Management Measures

Flood Damage Reduction Measures  No Action  Upstream Floodwater Storage  Permanent Levee/Floodwall System  West Aligned Diversion Plan  East Aligned Diversion Plan  North Aligned Diversion Plan  Northeast Aligned Diversion Plan  Channel Modifications/Riverbank Unloading  High-flow Cutoff Channels  Railroad Bridge Modifications  Nonstructural Measures

Additional Measures  Ecosystem Restoration Restore habitat areas currently in marginal farmlands. Considered to be optional features to the project, not stand alone features.  Recreation Multi-purpose trails; off-road vehicle trails; a canoe trail; camping facilities. Tree and native plantings.

Roseau River Flood Damage Reduction Project S tep 4,5,6 Comparison, Evaluation & Selection

Eliminated Measures - Preliminary Screening  Upstream Flood Water Storage  Channel Modifications  Non-Structural Measures

Evaluation & Comparison of Alternatives Eliminated the following: West Aligned Diversion Channel North Aligned Diversion Channel Northeast Aligned Diversion Channel High Flow Cutoff Channels Railroad Bridge Modifications Ecosystem Restoration

Evaluation & Comparison of Alternatives AlternativeNet Benefits Levee/Floodwall 25-year$188, year$1,189, year$1,074,000 East Diversion 50-foot$1,103, foot$1,210, foot$924,000

Evaluation & Comparison of Alternatives Optimization of the East Diversion Plan Bottom WidthNet Benefits 50-feet$1,103, feet*$1,210, feet$924,000 *NED Plan

Reducing residual damages 150-foot Plan = High Residual Damages Team Reintroduced Secondary Features:  Small In-Town Levees  Railroad Bridge Modifications  Non-Structural Measures

Plan Selection East Diversion Channel (NED Plan Features)  4.5 miles diversion channel  763 acres of land acquisition  5.1 miles of levees within the diversion channel w/ riprap in some spots  2 gated culverts  Control structures  Construction of 3 bridges  Relocations of electrical, sewer, gas and telephone infrastructure  8.25 acres of affected wetlands  ~ 200 acres of native plantings to provide ground cover in project area  Lower driveway (0.6’) on west side of river to maintain existing breakout flows

Plan Selection East Diversion Channel with Downstream Storage Areas (LPP Plan Features)  ~4.1 miles of add’l levees used to contain peak flows w/in storage areas  ~5.1 miles of reduced levee heights; reduction varying from 2 to 5 feet  1,089 acres of add’l land acquisition for storage areas/associated levees  0.69 miles of add’l road raises ranging from 2 to 4 feet  9.0-acre reduction in disposal stockpiles; material to be used in levee construction  4 add’l spillways along the levee system to allow for peak flow storage  1.46 additional acres of affected wetlands

Plan Selection Recreation Plan Features  3 multi-purpose recreational trail loops  4.3 miles of canoe trails  Scenic overlook, 2 interpretive sites, & birding stations  9 miles of off-road vehicle trails  Restrooms, picnic facilities, grills  5 acres of hardwood planting for trail & park areas  Planting of 25 acres of wooded areas near trails