storm damage reduction project town of kitty hawk, north carolina
DESCRIPTION
Storm Damage Reduction Project Town of Kitty Hawk, North Carolina Coastal Planning & Engineering of North Carolina July 7, 2014 Ken Willson. Outline:. Preliminary Overtopping Analysis: Identifying Problem Areas Recommended Actions Preliminary Design Concepts: Volumes - PowerPoint PPT PresentationTRANSCRIPT
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Storm Damage Reduction Project
Town of Kitty Hawk, North Carolina
Coastal Planning & Engineering of North Carolina
July 7, 2014
Ken Willson
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Outline:• Preliminary Overtopping Analysis:
Identifying Problem Areas Recommended Actions
• Preliminary Design Concepts:• Volumes
• Schedule Update:Environmental DocumentationEngineering DesignOffshore Sand Search
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1. To reduce the vulnerability of public infrastructure including NC 12, Town roads between NC 12 and U.S. Highway 158, and utilities to storm-induced erosion;
2. To reduce flooding experienced in many non-oceanfront areas throughout the Town during ocean over wash conditions, including portions of highway NC 12 and U.S. Highway 158; and
3. To reduce the vulnerability of homes within the Town that front the Atlantic Ocean and are exposed to wave events during nor’easters and other large storm events as well as natural erosional trends.
Goals of the Storm Damage Reduction Project
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• LiDAR Analysis
• Site Visit (Feb. 21, 2014)
• Management Action Alternatives:
– Uniform Dune Elevation
– Adding Material/Truck Haul
– Relocation of Parking Areas
– Raising Driveways/Parking Areas
– Modification to Public/Emergency Vehicle Beach Access
Preliminary Overtopping Analysis
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Preliminary Overtopping Analysis(Uniform Dune Elevation)
– Property owners should be advised to construct a continuous and uniform dune
– Adjacent property owners should coordinate to ensure uniformity
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Preliminary Overtopping Analysis(Adding Material/Truck Haul)
– Beach Push/Scraping can cause a loss of sand from adjacent areas– Case by case determination of best place for sand placement– Consider sand removed from road for use
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Preliminary Overtopping Analysis(Adding Material/Truck Haul)
– Beach Push/Scraping can cause a loss of sand from adjacent areas– Case by case determination of best place for sand placement– Consider sand removed from road for use
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Preliminary Overtopping Analysis(Relocation of Parking Areas)
– Spaces on west side of structures– Consider limiting parking to one or two cars– Consider incentives to limiting parking – Work with neighbors to provided parking to renters
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Preliminary Overtopping Analysis(Relocation of Parking Areas)
– Spaces on west side of structures– Consider limiting parking to one or two cars– Consider incentives to limiting parking – Work with neighbors to provided parking to renters
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Preliminary Overtopping Analysis(Raising Driveways/Parking Areas)
– Reconstruct driveway to follow adjacent dune contours– Consider incentives– Potential for adjacent property owners to work together
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Preliminary Overtopping Analysis(Raising Driveways/Parking Areas)
– Reconstruct driveway to follow adjacent dune contours– Consider incentives– Potential for adjacent property owners to work together
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Preliminary Overtopping Analysis(Raising Driveways/Parking Areas)
– Raising emergency vehicle beach access
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Preliminary Overtopping Analysis(Raising Driveways/Parking Areas)
– Raising emergency vehicle beach access
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Preliminary Overtopping Analysis(Modification to Public/Emergency Vehicle
Beach Access)
– Install timber walkover/drive-over structures at public/emergency vehicle access points.
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Preliminary Overtopping Analysis(Modification to Public/Emergency Vehicle
Beach Access)
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Preliminary Design
Concepts
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Storm Damage Reduction Project
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Design Beach
Storm Damage Reduction Project
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Constructed Beach Fill
Storm Damage Reduction Project
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Post-ConstructionAdjustment in 1-3 years
Storm Damage Reduction Project
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Advance Fill
Design Beach
Storm Damage Reduction Project
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Dune
+13.0 ft.
Loss of Advance Fill In 5-7 years
Design Beach
Storm Damage Reduction Project
Berm Width6.0 ft.
NAVD88
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Storm Damage Reduction Project
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Storm Damage Reduction Project
When structures are seaward of the dune, more sand is required toconstruct the design seaward of the structures.
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Storm Damage Reduction Project
When structures are seaward of the dune, more sand is required toconstruct the design seaward of the structures.
Built in front of structures
Berm Width6.0 ft.
NAVD88
Dune
+13.0 ft.
Design Beach
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Design Beach
Storm Damage Reduction Project
When structures are seaward of the dune, more sand is required toconstruct the design seaward of the structures.
Tie into existing dune
Berm Width6.0 ft.
NAVD88
Dune
+13.0 ft.
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ALTERNATIVE VOLUME (CY) DENSITY (CY/FT)
ALTERNATIVE 1 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Tie into Existing Dune)
1,583,000 81.3
ALTERNATIVE 2 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Seaward of Structures)
2,872,000 147.4
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Storm Damage Reduction Project
When structures are seaward of the dune, more sand is required toconstruct the design seaward of the structures.
Built in front of structures
Berm Width6.0 ft.
NAVD88
Dune
+13.0 ft.
Design Beach
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Storm Damage Reduction Project
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Storm Damage Reduction Project
When structures are seaward of the dune, more sand is required toconstruct the design seaward of the structures.
Built in front of structures
Berm Width6.0 ft.
NAVD88
Design Beach
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ALTERNATIVE VOLUME (CY) DENSITY (CY/FT)
ALTERNATIVE 1 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Tie into Existing Dune)
1,583,000 81.3
ALTERNATIVE 2 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Seaward of Structures)
2,872,000 147.4
ALTERNATIVE 2A – Dune and Berm Design (20 ft. wide, 13 ft. high dune – Where Needed; 50 ft. wide, 6 ft. high berm (Seaward of Structures)
2,707,000 138.9
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Storm Damage Reduction Project
50’ Berm Width6.0 ft.
NAVD88
Design Beach
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Storm Damage Reduction Project
Built in front of structures
50’ Berm Width6.0 ft.
NAVD88+13.0 ft.
Design Beach
20’ Dune Width
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Storm Damage Reduction Project
30’ Berm Width6.0 ft.
NAVD8810’ Dune
Width+12.0 ft.
Design Beach
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ALTERNATIVE VOLUME (CY) DENSITY (CY/FT)
ALTERNATIVE 1 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Tie into Existing Dune)
1,583,000 81.3
ALTERNATIVE 2 – Dune and Berm Design (20 ft. wide, 13 ft. high dune; 50 ft. wide, 6 ft. high berm (Seaward of Structures)
2,872,000 147.4
ALTERNATIVE 2A – Dune and Berm Design (20 ft. wide, 13 ft. high dune – Where Needed; 50 ft. wide, 6 ft. high berm (Seaward of Structures)
2,707,000 138.9
ALTERNATIVE 3 - Berm Only (50 ft. wide, 6 ft. high berm 1,508,000 77.4
ALTERNATIVE 4 – Minimal Dune Design (10 ft. wide, 12 ft. high dune – Where Needed; 30 ft. wide, 6 ft. high berm (Seaward of Structures)
1,620,000 83.1
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Schedule Update
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Geotech Investigation
Preliminary Draft EA (August 29, 2014)
CONSTRUCTION (February 2016)
Bidding (11/2/15 – 12/1/15)
Environmental Documentation
EngineeringDesign
Public Comment on Draft EA(November 4 – December 3, 2014)
Final EA (March 3, 2015)
Submit Draft BA and EFH
(July 15, 2014)
Submit Final BA and EFH
(Sept 13, 2014)
1 – YearCoordination
BOEM/USACE/NMFS/USFWS
Submit Permit Applications(April 30, 2015)
Permits Issued (September, 2015)
Draft EA(November 3, 2014)
