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Mid-Barataria Diversion - Status Update

Mid-Barataria Diversion - Status Update. Andrew Beall Project Manager Governor’s Advisory Commission Meeting December 5, 2012. committed to our coast. committed to our coast. Keystone of the 2012 Master Plan: Reconnecting the River. Uses up to 50% of the Mississippi River’s peak flow.

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Mid-Barataria Diversion - Status Update

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  1. Mid-Barataria Diversion- Status Update Andrew Beall Project Manager Governor’s Advisory Commission Meeting December 5, 2012 committed to our coast committed to our coast

  2. Keystone of the 2012 Master Plan: Reconnecting the River Uses up to 50% of the Mississippi River’s peak flow. Flow regimes of sediment diversions based on flow in river. Large-scale diversions (250,000 cfs) operate at full capacity for short periods of time (typically less than a month) and in some years, are not operated at all at full capacity. Coastal Protection and Restoration Authority of Louisiana

  3. Mid-Barataria Diversion • Identified 8 Diversion Projects, including one in the vicinity of Myrtle Grove • “Mid-Barataria Sediment Diversion” • 50,000-250,000 cfs sediment diversion in the vicinity of Myrtle Grove intended to maintain existing land and build new land • Two phases- initial 50,000 cfs magnitude, then increase to larger 250,000 cfs magnitude sometime in the future Coastal Protection and Restoration Authority of Louisiana

  4. State/EDF Joint Myrtle Grove Investigation • Final Comprehensive Report – December 2011 • Joint venture between CPRA & Environmental Defense Fund intended to provide the LCA Feasibility Study with robust decision making tools in the form of numerical hydrodynamic models based on site specific observational data • Included site specific river data collection, riverside hydrodynamic modeling, and bayside hydrodynamic and land building modeling • Multi-dimensional river modeling of an array of diversion sizes, locations and alignments to identify optimal intake location and diversion configuration • Bayside hydrodynamic modeling of water levels and velocities to evaluate impacts of different discharges and operating regimes Coastal Protection and Restoration Authority of Louisiana

  5. Mid-Barataria Basis for Design #1 – Capacity 75,000 cfs – Dr. Ehab Meselhe’s results (sediment/water ratios) #2 – Alignment Based on an intensive Mississippi River data collection and modeling effort, the location of the intake channel and the outfall channel alignment has been carefully selected at river mile 60.7 above Head of Passes to optimize the capture of sedimentfrom the river.  Coastal Protection and Restoration Authority of Louisiana

  6. Mid-Barataria Diversion Alignment

  7. Mid-Barataria Basis for Design • Geotechnical • Channel/Guide Levees • Structure • Flume • MR&T Levee • Back Hurricane Levee • Surveys • Interior Alignment Survey • LA-23 Survey • MR&T Levee Tie-in Survey • Hurricane Levee Tie-in Survey • Drainage Canal Survey #3 –Data Collection Required • Geotechnical Engineering/Analysis: • Slope stability & Consolidation/Settlement (Concurrent) • Headworksfor Diversion Structure (Deep Foundations and Loadings) • Bridge Pile Capacities (Deep Foundations) Coastal Protection and Restoration Authority of Louisiana

  8. Mid-Barataria Basis for Design • Dredging plan for excavation in front of flume • Revetment Removal • MR&T Levee Tie-In • Flume • Structure • Channel & Guide Levees • Rail Road Bridge • Highway 23 Detour • Highway 23 Bridge • Pump station/Drainage Plan • Back Hurricane Levee Tie-in #4 –Design of Construction Features Packaged into 5 construction volumes which can be bid separately or in combinations. Coastal Protection and Restoration Authority of Louisiana

  9. Other Critical Items • NEPA Compliance • Solicitation of Views/Public Involvement • Cultural Resources • Permitting – Section 404, Section 408 • NEPA Document • Operations and Maintenance Plan • Adaptive Management Plan • Land Rights • Ship Simulation Coastal Protection and Restoration Authority of Louisiana

  10. Selection Process Milestones and Current Status • June 2012 Requested a Statement of Interest and Qualifications from 8 IDIQ firms • Informational meeting held June 28 • July 2012 SIQ submittals were evaluated by a panel of 5 technical reviewers • 4 firms shortlisted • August 2012 Shortlisted firms give detailed presentation to the CPRA Chiefs • HDR selected as the design firm • Hurricane Isaac • October 2012 Initial Tasking provided to HDR for Project Management and Initiation Tasks • November to December 2012 – Contract Negotiations with HDR • January 2013 Anticipated NTP Coastal Protection and Restoration Authority of Louisiana

  11. Proposed Milestone Schedule Increment I (6 months) Increment II (12 months) 1st Quarter 2014 2nd Quarter 2014 Start January 2013 1st Quarter 2013 2ndQuarter 2013 3rd Quarter 2013 4th Quarter 2013 PermitSubmittal USACE Permit Review Engineering Tasks Survey Geotechnical 30% Design Effort 60% Design Effort 95% Design Effort E&D Land Rights Tasks NEPA Tasks Coastal Protection and Restoration Authority of Louisiana

  12. Questions? committed to our coast committed to our coast

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