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.
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
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
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
#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
• Dredging plan for excavation
• Channel & Guide Levees
• Rail Road Bridge
in front of flume
• Revetment Removal
• Highway 23 Detour
• MR&T Levee Tie-In
• Highway 23 Bridge
• Flume
• Pump station/Drainage Plan
• Structure
• Back Hurricane Levee Tie-in
Packaged into 5 construction volumes which can be bid separately or
in combinations.
Coastal Protection and Restoration Authority of Louisiana
• NEPA Compliance
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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 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
Start January 2013
Increment I (6 months)
1st Quarter
2nd Quarter
2013
2013
USACE Permit Review
Increment II (12 months)
1st Quarter
3rd Quarter
4th Quarter
2014
2013
2013
Permit
Submittal
2nd Quarter
2014
Engineering Tasks
Survey
Geotechnical
E&D
30% Design Effort
60% Design Effort
Land Rights Tasks
NEPA Tasks
Coastal Protection and Restoration Authority of Louisiana
95% Design Effort
Questions?
committed to our coast
committed to our coast