Midway Reach 30% Design Final Report

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From the report:
“The Midway Reach is a confined valley with bedrock-controlled pockets of floodplain. The channel widens slightly through this reach, with valley-bottom widths ranging from 150 feet to 400 feet, allowing for narrow floodplain development confined by valley walls, residential property, and US 34. The channel bed is comprised of boulders, cobbles, and gravel, with small to moderate sized bedform features (e.g., steps, pools, riffles) and average slopes of 2.5% and 2.3% for the Upstream and Downstream reaches, respectively. Expansion and widening during the 2013 flooding caused significant bank erosion, over-widening of the channel, and stripping of vegetation and riparian habitat. Extensive incision and scouring within this reach resulted in the disconnection of the floodplain with the channel in some sections and removal of large material and bedforms. Subsequent deposition on the receding limb of the flood caused debris and sediment to accumulate in relatively less confined sections of the reach. The postflood emergency response efforts in this reach resulted in filling the floodplain benches with excess alluvium and the removal of large material from the channel to armor infrastructure and adjacent banks and to clear the channel.”

Downloads: (large .pdfs)
01 BTWC_PriorityReaches_30%_BasisOfDesign_Midway_FINAL_20180228
02 Appendix A—30% Design Planset
03 Appendix B—Hydraulic Modeling Results
04 Appendix C—Aquatic Habitat Exhibit
05 Appendix D—Design Calculations Midway rev
06 Appendix E—Revegetation Restoration Plan Approach and Exhibits
07 Appendix F—Opinion of Probable Costs
08 Appendix G—Monitoring&AdaptiveMgmtStrategy_20180228
09 30signComments_Midway_FINAL

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