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

Keystone of the 2012 Master Plan: Reconnecting the River 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. Uses up to 50% of the Mississippi River’s peak flow. Coastal Protection and Restoration Authority of Louisiana

Identified 8 Diversion Projects, including one in the vicinity of Myrtle Grove “Mid-Barataria Sediment Diversion” 50, ,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 Mid-Barataria Diversion

Coastal Protection and Restoration Authority of Louisiana 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 State/EDF Joint Myrtle Grove Investigation

#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 sediment from the river. Coastal Protection and Restoration Authority of Louisiana

#3 –Data Collection Required Geotechnical 1.Channel/Guide Levees 2.Structure 3.Flume 4.MR&T Levee 5.Back Hurricane Levee Surveys 1.Interior Alignment Survey 2.LA-23 Survey 3.MR&T Levee Tie-in Survey 4.Hurricane Levee Tie-in Survey 5.Drainage Canal Survey Geotechnical Engineering/Analysis: 1.Slope stability & Consolidation/Settlement (Concurrent) 2.Headworks for Diversion Structure (Deep Foundations and Loadings) 3.Bridge Pile Capacities (Deep Foundations) Coastal Protection and Restoration Authority of Louisiana

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

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

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

Start January st Quarter nd Quarter rd Quarter th Quarter st Quarter nd Quarter 2014 Engineering Tasks Land Rights Tasks NEPA Tasks USACE Permit Review Geotechnical Survey E&D Increment I (6 months) Increment II (12 months) 95% Design Effort60% Design Effort30% Design Effort Coastal Protection and Restoration Authority of Louisiana Permit Submittal

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