Mid-Barataria Diversion- Status Update

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Andrew BeallProject Manager

Governor’s Advisory Commission MeetingDecember 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

Coastal Protection and Restoration Authority of Louisiana

• Identified 8 Diversion Projects, including one in the vicinity of Myrtle Grove

• “Mid-Barataria Sediment Diversion”• 50,000-250,000 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

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 – Capacity75,000 cfs – Dr. Ehab Meselhe’s results (sediment/water ratios)

#2 – AlignmentBased 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.

Mid-Barataria Basis for Design

Coastal Protection and Restoration Authority of Louisiana

Mid-Barataria Diversion Alignment

#3 –Data Collection Required

Geotechnical1. Channel/Guide Levees2. Structure3. Flume4. MR&T Levee5. Back Hurricane Levee

Surveys1. Interior Alignment Survey 2. LA-23 Survey3. MR&T Levee Tie-in Survey4. Hurricane Levee Tie-in Survey5. 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

Mid-Barataria Basis for Design

#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

Mid-Barataria Basis for Design

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

Other Critical Items

Coastal Protection and Restoration Authority of Louisiana

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

Selection Process Milestones and Current Status

Start January 2013 1st Quarter 2013

2nd Quarter 2013

3rd Quarter 2013

4th Quarter 2013

1st Quarter 2014

2nd 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

Proposed Milestone Schedule

Permit Submittal

Questions?

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