Post on 31-Dec-2015
description
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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