1 Section 206: Aquatic Ecosystem Restoration Big Escambia Creek, Escambia Counties, Alabama and...
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Transcript of 1 Section 206: Aquatic Ecosystem Restoration Big Escambia Creek, Escambia Counties, Alabama and...
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Section 206: Section 206: Aquatic Ecosystem RestorationAquatic Ecosystem Restoration
Big Escambia Creek, Big Escambia Creek, Escambia Counties, Escambia Counties, Alabama and FloridaAlabama and Florida
Presented By:Presented By:Charles Owens Charles Owens
Project Management Project Management
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Aquatic Ecosystem RestorationSection 206
WRDA 1996, as amendedObjective: restore degraded aquatic ecosystems
A Restoration Project is adopted for construction only after investigation shows that the restoration will improve the environment, is in the public interest, and is cost-effective.
Each project is limited to a Federal cost of not more than $5 million. This Federal limitation includes all project-related costs for feasibility studies, planning, engineering, construction, supervision, and administration.
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EscambiaEscambia RiverRiver
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ALAL
FLFL
CSX Railroad
Northern Portion of Big Escambia CreekNorthern Portion of Big Escambia Creek Pre-ConstructionPre-Construction
NN
Fannie Road
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Looking West
EscambiaEscambia RiverRiver
Southern Portion of Big Escambia CreekSouthern Portion of Big Escambia Creek Pre-ConstructionPre-Construction
Looking East
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ALAL
FLFL
CSX Railroad
Fannie Road
NN
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Gravel Mining OperationGravel Mining Operation
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Restored ChannelExisting Channel
Restored Channel
Logjam #1
Original Channel
Restored Channel
Logjam #2
Original Channel
Big Escambia Creek Big Escambia Creek
RestorationRestoration ProjectProject
Primary Diversion StructureSecondary Diversion
StructureRestored Creek Channel
Key:
Bank Log Vane
Cross- Vane
Log Vane
Root Wad
Root Wad Footer
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Restored Existing Restored Existing ChannelChannel
Northernmost Northernmost LogjamLogjam
Braided Channels as a Braided Channels as a result of the Logjamresult of the Logjam
CSX Railroad CSX Railroad BridgeBridge
Original ChannelOriginal Channel
Northern Portion of the Restoration Northern Portion of the Restoration ProjectProject
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Primary Primary Diversion Diversion StructureStructure
Restored ChannelRestored Channel
Fannie Road BridgeFannie Road Bridge
Existing ChannelExisting Channel
Southern Portion of the Restoration ProjectSouthern Portion of the Restoration Project
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A view of the Southern Portion of the Project located south of the Primary Diversion Structure looking northward
Again south of the Diversion Structure but now looking southward
Notice minimal removal of trees adjacent to the channel
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Three J-Hooks Structures Three J-Hooks Structures located in one of the Big located in one of the Big
Escambia Creek Bends Escambia Creek Bends Root Wads are forced into the ground in Root Wads are forced into the ground in order to stabilize logs running parallel order to stabilize logs running parallel and perpendicular to the creeks’ bankand perpendicular to the creeks’ bank
• Cables are used to reinforce stability of the Cables are used to reinforce stability of the structures at the Middle and Bank Rootwad/Log structures at the Middle and Bank Rootwad/Log ConnectionConnection
• Geotextile fabric is placed in the upper portion Geotextile fabric is placed in the upper portion
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• In addition to these In addition to these structures, Rootwad Clusters structures, Rootwad Clusters have been placed within the have been placed within the creek’s pools to increase creek’s pools to increase aquatic habitataquatic habitat
• Cross veins have been Cross veins have been utilized to also divert flowutilized to also divert flow
Trees have been driven into Trees have been driven into the creek bottom leaving the creek bottom leaving the exposed rootwadthe exposed rootwad
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Adaptive Management Process: Adaptive Management Process: • The project team and contractor discussed Minor Channel The project team and contractor discussed Minor Channel Re-Alignment due an Existing Natural Eastern Bank of Re-Alignment due an Existing Natural Eastern Bank of Extensive Roots Intertwined within it; thus, providing natural Extensive Roots Intertwined within it; thus, providing natural bank stabilitybank stability
• Natural Bank is more stable than that of the Man-made Bank Natural Bank is more stable than that of the Man-made Bank
Eastern Bank Eastern Bank with Root with Root
massmass
Additional Root Additional Root mass further mass further south along the south along the channelchannel
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Restoration of Big Escambia Creek Restoration of Big Escambia Creek promoted Additional Point Sand Bars promoted Additional Point Sand Bars
to occur within the channelto occur within the channel
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Project Benefits
Restoration of Ecological Conditions Along the Lower Four Mile Reach of Big Escambia Creek Watershed.
Reduction of Flood Damages at Flomaton, Alabama and Century, Florida.
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Project Completion
The Project was completed in August 2005.
The project was damaged by Hurricanes Ivan, Dennis and Katrina.
– Emergency Funding Requested to Restore Hurricane Damaged Areas.