increase atchafalaya flow to terrebonne governor’s advisory commission meeting 7 august 2013...
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Increase Atchafalaya Flow to TerrebonneGovernor’s Advisory Commission Meeting7 August 2013
committed to our coastcommitted to our coast
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Coastal Protection and Restoration Authority of Louisiana
Master Plan Projects
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Coastal Protection and Restoration Authority of Louisiana
• Dredging of GIWW east of the Atchafalaya River and installation of a bypass structure at the Bayou Boeuf Lock to increase freshwater and sediment flows from the Atchafalaya River to Terrebonne marshes
• Modeled to maintain a minimum of 20,000 cfs east along the GIWW towards the HNC
• Included in the 1st Implementation Period (2012-2032).
• Engineering and design, construction, and operations and maintenance 50 year budget of $299M.
• Projected to build, sustain, or maintain 13-27 square miles of land
Master Plan AssumptionsSpecific Project Details
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Study Area Map
FOURLEAGUE BAY
CAILLOU LAKE
LAKE PALOURDE
LAKE DE CADE
Bay JunopCocodrie
Dulac
Montegut
Thibodaux
Lockport
LOST LAKE
TERREBONNE BAY
Houma
Galliano
Franklin
Morgan City
GU LF INTR ACOASTAL WATER WAY
ATCHAFALAYA RIVE R
BAYOU LAFOURC HE
BAY
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RR
EB
ON
NE
ATCH AFALAYA BAY
LAKE MEC HAN T
BA
YO
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BAYOU SCHAFFER
Increase Atchafalaya Flow to Terrebonne Study Area
TE-110 Study Area [20130625]
Extended Study Area
TE-110 Study Area [20130722]
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Projected Future Land Loss – Master Plan Moderate Scenario
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Target Area Map
FOURLEAGUE BAY
CAILLOU LAKE
LAKE PALOURDE
LAKE DE CADE
Bay JunopCocodrie
Dulac
Montegut
Thibodaux
Lockport
LOST LAKE
TERREBONNE BAY
Houma
Galliano
Franklin
Morgan City
GU LF INTR ACOASTAL WATER WAY
ATCHAFALAYA RIVE R
BAYOU LAFOURC HE
BAY
OU
TE
RR
EB
ON
NE
ATCH AFALAYA BAY
LAKE MEC HAN T
BA
YO
U S
EG
NE
TT
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HO
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A N
AV
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BAYOU SCHAFFER
Increase Atchafalaya Flow to Terrebonne Study and Target Area
TE-110 Study Area [20130722]
TE-110 Target Area
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Coastal Protection and Restoration Authority of Louisiana
• Purpose: Utilize freshwater and sediment from the Atchafalaya River in order to build, sustain, and maintain wetlands within the Terrebonne Basin
• Objective 1:• Distribute Atchafalaya River resources to the Terrebonne Basin in order to
increase the potential to build, sustain, and maintain wetlands
• Objective 2:• Use material dredged from the GIWW as a component of this project to
directly create additional wetlands within the project area
• Need:• This project is needed in order to achieve, in part, the goals of the 2012
Louisiana Coastal Master Plan and address hydrologic alterations within the Terrebonne Basin. The lack of both freshwater and sediment inputs due to hydrologic alterations have resulted in increased saltwater intrusion and high subsidence rates, thus significantly contributing to wetland loss within the Basin.
Project Specific Purpose and Need
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Coastal Protection and Restoration Authority of Louisiana
Project Kick Off Site Visit – May 30, 2013• Toured:
• Bubba Dove Flood Control Structure in the Houma Navigational Canal and potential future Houma Navigational Canal Lock site
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Coastal Protection and Restoration Authority of Louisiana
Project Kick Off Site Visit – May 30, 2013• Wetlands in the vicinity of Minor’s Canal to Marmande Ridge near Lake
Theriot, Lake Decade, Lake Penchant, and Bayou Penchant
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Coastal Protection and Restoration Authority of Louisiana
• Project Kick off Meeting Held – 23 May 2013
• Data Gap Analysis Compete – September 2013
• Alternatives Formulation, Evaluation, & Comparison - Summer 2013 – Summer 2014
• Plan Selection – Summer 2014
DRAFT Project Schedule
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Coastal Protection and Restoration Authority of Louisiana
Questions/Comments
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Coastal Protection and Restoration Authority of Louisiana
Master Plan – Increase Atchafalaya ProjectPotential Marsh Creation Component
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Coastal Protection and Restoration Authority of Louisiana
• Creation of approximately 1,190 acres of marsh along the GIWW in Terrebonne Basin (through sediment dredging of the GIWW) to create new wetland habitat, restore degraded marsh, and reduce wave erosion
• Included in the 1st Implementation Period (2012-2032).
• Engineering and design, construction, and operations and maintenance 50 year budget of $37M.
Master Plan AssumptionsSpecific Project Details