Current Design Studies

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All alternatives analyses are driven by WSAFCA and the City's desire and obligation to ensure your health and safety through flood risk-education. They are conducted within the context of a rational, objective, data and science-driven processes defined by state and federal regulations. They are administered under the highest standards of professional practice. Analyses are reviewed by WSAFCA, the state's Department of Water Resources, U.S. Army Corps of Engineers and an independent Board of senior consultants. These experts confirm the effectiveness, efficiency, feasibility of construction, risk-reduction, delivery of ancillary benefits and operation and maintenance demands.

From the initiation of the detailed design in early 2010, the design team has focused on the segments of levee that have properties adjacent to the levee with the goal of avoiding impacts whenever feasible.

A detailed value engineering study was conducted for Segments known as B and F to identify the feasible alternatives, costs and cost sharing for these segments <<see map>>. This study included identifying the alternatives that would have the smallest footprint to minimize property impacts.

Two design alternatives (Alternative 1 and Alternative 2) were developed to the 15% level of design completion and presented to the WSAFCA Board on January 12, 2012.

As a result of evaluation and outreach regarding design studies, on March 8, 2012, the WSAFCA Board of Directors identified the preferred design alternative known as Alternative 2, based on previous technical information and staff recommendations. With an identified preferred alternative, additional analysis will focus on the effects of the alternative on private property, the environment and community, to determine how best to minimize and mitigate those impacts.

The identified preferred Alternative 2 proposes the following corrective measures for each segment:

  • Segment A: fix-in-place/levee slope flattening and conventional seepage cut-off wall.
  • Segment B: fix-in-place/levee slope flattening and conventional seepage cut-off wall; adjacent levee with seepage berm; setback levee with seepage berm.
  • Segment C: setback levee with seepage berm.
  • Segment D: setback levee with seepage berm; setback levee with conventional cut-off wall.
  • Segment E: setback levee with conventional cut-off wall; setback levee with seepage berm.
  • Segment F: setback levee with seepage berm, adjacent levee with seepage berm.
  • Segment G: adjacent levee with conventional cut-off wall.

Currently working toward 65 percent design completion, the final project selection will be based on completion of environmental studies. Value engineering studies in areas known as Segments B and F were conducted to make sure all technically feasible measures were investigated to minimize impacts to private property owners adjacent to the levee. 65 percent design results are anticipated to be shared with the WSAFCA Board in March or April 2013.

The Environmental Impact Statement and Report should be complete by mid 2013. The Environmental Impact Statement/ Report determines potential effects on both the natural and built environments are analyzed and disclosed to the public. Additionally, analysis of the activity's alternatives and development of mitigation measures to reduce effects are required.

Once the design process advances to a level that defines adjacent property impacts, WSAFCA will engage in formal real estate acquisition proceedings with owners whose properties are likely to be affected by the project. This is estimated to be in summer 2013 with initiation of the appraisal process.

WSAFCA is committed to the goal of settling all real estate acquisitions with the best possible outcome for all parties involved while delivering benefits to the community that complement the primary objectives of protecting lives and property.

The selection of the final project alternative is anticipated to occur upon certification of the Environmental Impact Statement and Report and when design to 100 percent is complete in fall 2013.

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