EP 1110-1-8
(Vol. 12)
31 July 03
CHAPTER 4 METHODOLOGY FOR DREDGING PLANT AND MARINE EQUIPMENT
SECTION I. GENERAL
4.1
Contents
This chapter contains the methodology used to compute ownership and
operating rates for dredging plant and permanent floating plant such as floating pile-
driving equipment. Dredging plant is marine equipment used for dredging operations for
the majority of its life or designed and built for marine/dredging use.
4.2
General
a. The ownership and operating rates provided in table 2-1, category M-10,
are based on the methodology in chapter 2 for nondredging equipment. However, the
cost data (Acquisition Cost, Horsepower, and Fuel Type) may be used for calculation of
dredging plant and marine equipment rates, provided they are calculated in accordance
with the methodology provided in this chapter.
b. Table 4-1 shows ownership and operating cost factors for various types of
dredging plant. When a type of plant is not listed, the cost is estimated by using the
factors listed in this table for a similar type of plant.
c. The methodology for determining operating rates for hopper dredges was
omitted from this pamphlet due to the limited number of hopper dredges and the
complexity of the methods used to calculate the rates. Further information on hopper
dredges can be found in Engineer Regulation (ER) 1110-2-1302, Engineering and
Design, Civil Works Cost Engineering, and on the Internet at
methodology for calculating ownership cost is in section V of this chapter.
d. For mechanical dredges, the cost of the bucket is typically included in the
plant value, therefore, no additional allowance should be made for ownership cost. If
the bucket cost is not included in the plant value, the bucket may be treated as a
separate unit of equipment.
SECTION II. ANNUAL USE
4.3
Time Available to Dredge
a. The number of months available per calendar year (yr) for dredging shall be
based on the work time available to dredge, excluding downtime for major repairs, work
in dry dock, bad weather, and environmental restrictions. Figure 4-1 depicts months
available for dredging, including mobilization and demobilization, based on historic data
collected by the U.S. Army Corps of Engineers' regional dredge estimating teams. The
data in figure 4-1 shall be used for computing the ownership costs unless specified
otherwise in the contract documents.
4-1
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