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 ing distances to about 1,000 m of the shoreline for maximum production.
To achieve economical production, about 10 m of sediment is required.
The PN 250 has a pump capacity of 800 m3/hr (1,046 yd3/hr). The PN
400's pump capacity is 2,400 m3/hr (3,140 yd3/hr).
Current usage
The PUNAISE has been demonstrated successfully on three projects in
The Netherlands during the mid-1990s: Bloemendaal, Zandvoort, and
Heemskerk.
Potential application
The PUNAISE dredging system has potential application at the following
sites:
a. Grays Harbor, Washington, for beach nourishment for an area south
of the south jetty (Seattle District, Corps of Engineers).
b. Disposal area "E" at the Columbia River, Oregon, and at the
Washington entrance bar. Area "E" is an open-water hopper
dredge disposal site that mounds up during normal hopper dredge
disposal operations. Using the PUNAISE, material could be placed
in northerly locations to enhance natural beach replenishment ac-
tivities (Portland District, Corps of Engineers).
c. Marshland creation in conjunction with a dredging sediment catch
basin in the Southwest Pass of the Mississippi River (New Orleans
District, Corps of Engineers).
d. Various beach protection locations along the east coast between
New York and Florida (New York District, Philadelphia District,
Wilmington District, Jacksonville District, Corps of Engineers).
Cost
Unit costs per cubic yard of sediments excavated with the P UNAISE range
between $3.00 and $4.50.
9
Chapter 4
Detailed Evaluations
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