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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. Outline:. Preliminary Overtopping Analysis: Identifying Problem Areas Recommended Actions Preliminary Design Concepts: Volumes

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slide1

Storm Damage Reduction Project

Town of Kitty Hawk, North Carolina

Coastal Planning & Engineering of North Carolina

July 7, 2014

Ken Willson

outline
Outline:
  • Preliminary Overtopping Analysis:
    • Identifying Problem Areas
    • Recommended Actions
  • Preliminary Design Concepts:
    • Volumes
  • Schedule Update:
    • Environmental Documentation
    • Engineering Design
    • Offshore Sand Search
slide3

Goals of the Storm Damage Reduction Project

  • 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;
  • 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
  • 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.
slide4

Preliminary Overtopping Analysis

  • 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
slide5

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
slide6

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
slide7

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
slide8

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
slide9

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
slide10

Preliminary Overtopping Analysis

(Raising Driveways/Parking Areas)

  • Reconstruct driveway to follow adjacent dune contours
  • Consider incentives
  • Potential for adjacent property owners to work together
slide11

Preliminary Overtopping Analysis

(Raising Driveways/Parking Areas)

  • Reconstruct driveway to follow adjacent dune contours
  • Consider incentives
  • Potential for adjacent property owners to work together
slide12

Preliminary Overtopping Analysis

(Raising Driveways/Parking Areas)

  • Raising emergency vehicle beach access
slide13

Preliminary Overtopping Analysis

(Raising Driveways/Parking Areas)

  • Raising emergency vehicle beach access
slide14

Preliminary Overtopping Analysis

(Modification to Public/Emergency Vehicle Beach Access)

  • Install timber walkover/drive-over structures at public/emergency vehicle access points.
slide15

Preliminary Overtopping Analysis

(Modification to Public/Emergency Vehicle Beach Access)

storm damage reduction project2
Storm Damage Reduction Project

Constructed Beach Fill

storm damage reduction project4
Storm Damage Reduction Project

Advance Fill

Design

Beach

storm damage reduction project5
Storm Damage Reduction Project

Berm Width

6.0 ft.

NAVD88

Dune

+13.0 ft.

Loss of Advance Fill

In 5-7 years

Design

Beach

storm damage reduction project6
Storm Damage Reduction Project
  • When structures are seaward of the dune, more sand is required to
  • construct the design seaward of the structures.
storm damage reduction project7
Storm Damage Reduction Project

Built in front of structures

Berm Width

6.0 ft.

NAVD88

Dune

+13.0 ft.

Design

Beach

  • When structures are seaward of the dune, more sand is required to
  • construct the design seaward of the structures.
storm damage reduction project8
Storm Damage Reduction Project

Tie into existing dune

Berm Width

6.0 ft.

NAVD88

Dune

+13.0 ft.

Design

Beach

  • When structures are seaward of the dune, more sand is required to
  • construct the design seaward of the structures.
storm damage reduction project9
Storm Damage Reduction Project

Built in front of structures

Berm Width

6.0 ft.

NAVD88

Dune

+13.0 ft.

Design

Beach

  • When structures are seaward of the dune, more sand is required to
  • construct the design seaward of the structures.
storm damage reduction project10
Storm Damage Reduction Project

Built in front of structures

Berm Width

6.0 ft.

NAVD88

Design

Beach

  • When structures are seaward of the dune, more sand is required to
  • construct the design seaward of the structures.
storm damage reduction project11
Storm Damage Reduction Project

50’ Berm Width

6.0 ft.

NAVD88

Design

Beach

storm damage reduction project12
Storm Damage Reduction Project

Built in front of structures

50’ Berm Width

6.0 ft.

NAVD88

20’ Dune

Width

+13.0 ft.

Design

Beach

storm damage reduction project13
Storm Damage Reduction Project

30’ Berm Width

6.0 ft.

NAVD88

10’ Dune

Width

+12.0 ft.

Design

Beach

slide37

Geotech

Investigation

Environmental

Documentation

Engineering

Design

Preliminary Draft

EA (August 29, 2014)

Draft EA

(November 3, 2014)

Submit Draft

BA and EFH

(July 15, 2014)

Public Comment on Draft EA

(November 4 – December 3, 2014)

Submit Final

BA and EFH

(Sept 13, 2014)

Final EA

(March 3, 2015)

Submit Permit Applications

(April 30, 2015)

1 – Year

Coordination

BOEM/USACE/

NMFS/USFWS

Permits Issued (September, 2015)

Bidding (11/2/15 – 12/1/15)

CONSTRUCTION (February 2016)

thank you
Thank You!

Questions?

Ken Willson – Kenneth.Willson@CBI.com