WILMINGTON HARBOR

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WILMINGTON HARBOR DREDGED MATERIAL MANAGEMENT
PLAN (DMMP)
Scoping Meeting Presentation Dec 8, 2005
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DMMP Background
HQ Policy Federal navigation projects must
demonstrate

sufficient dredged material disposal capacity for
20 years minimum. Oct
1997 Phase I - Preliminary Assessment May
2001 Phase II Upper Portion of Wilmington Hbr
Eagle Island Management Plan
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DMMP Process

• Year 1 data collection, surveys, mapping,
  coordination, evaluations to address major
  alternatives
• Years 2 3 data analysis, preliminary design,
  NEPA process (anticipated to be EIS)

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Hilton RR Bridge
DMMP Absolutes
New Hanover County
28 MI
Cape Fear Memorial Bridge
State Port

• Address all of Wilmington Harbor
• Dredging Mgmt Study
• Mgmt Plan for Eagle Island and other upland
  disposal sites

Brunswick County
Carolina Beach
MOTSU (Sunny Point)
Fort Fisher
MOTSU buffer zone
N
Mouth of Cape Fear River
WILMINGTON HARBOR DMMP
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Potential Alternatives

• New Confined Disposal Facilities (CDFs) at Eagle
  Island by expansion north

Eagle Island
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Eagle Island
Cell 5
Cell 4
Cell 3
Cell 2
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Loran Station
Construct CDF at the Coast Guard Loran Station on
River Road
N
River Road
Loran Station
Snows Cut
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Restoration/Rehab of CDFs

• Dike restoration/rehab at all existing CDFs
  (river islands)
• Restore capacity at existing sites by ocean
  disposal and/or beneficial use
• Islands 8 10
• Restore original footprint on channel side
• Create ecosystem restoration feature (rock sill)

z
Island 10
Island 8
Snows Cut
River Road
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Mid-Harbor Open Water Site

• Open water disposal site near Snows Cut (100-200
  acres)
• Could be done in conjunction with MOTSU proposed
  site

open water site?
Snows Cut
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Hilton RR Bridge
New Hanover County
MOTSU Buffer Area
28 MI
Cape Fear Memorial Bridge
State Port
New CDFs parallel to Dow Road at Carolina Beach
Brunswick County
Carolina Beach
MOTSU (Sunny Point)
Fort Fisher
MOTSU buffer zone
N
Mouth of Cape Fear River
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MOTSU buffer

• Eagle-Island type CDFs w/ multiple cells
• Pump sand in buffer area to beach prior to
  building CDFs

MOTSU buffer
Dow Road
Carolina Beach
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Sand Recycling

• Begin systematic sand recycling at Islands 3
  4 (Snows Marsh)
• Create borrow hole in the Reaves Point to Snows
  Marsh Channels (sand to depths of 55)

Snows Marsh
Island 3
Island 4
Fort Fisher Ferry
z
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Littoral Zone Disposal

• Establish a littoral zone disposal site for sand
  recycling
• Site in water depths 30-40
• For small quantities of sand not designated for
  Bald Head
• or Caswell Beaches (Sand Mgmt Plan)
• Could be added to the Sand Mgmt Plan

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Overflow Study
The effects of normal overflow process on
silt/clay content
Sediment w/ 20 silt Sediment w/10 silt?
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QUESTIONS?