12 December 2001
Table 5-5 Submarine Dimensions*
Diameter of "Barrel"
Breadth at Stern
Planes (m (ft))
*Note: "Trident" class missile submarines, having much larger draft and requiring
special service, are accommodated at special facilities.
Aircraft Carrier Facility Special Requirements. Dredge depth
requirements for Nimitz Class Aircraft Carriers are summarized below.
Water depth requirements for Nimitz Class Aircraft Carriers transiting to
and moored at homeports, ports of call, and shipyards are delineated in
COMNAVSEASYSCOM ltr 11460 Ser 03D3/242 dtd 3 Jan 95, included as Appendix B.
It specifies the minimum water depth required while the ship is in the waterway;
however, it does not specify dredge depth requirements. The minimum water depth
required to operate carriers in inner channels and turning basins on the way to and at
piers at home ports is between 14.9 and 15.24 m (49 and 50 ft) depending on harbor
salinity. These numbers are similar for ports of call. Due to the reduced draft when
visiting shipyards, the minimum water depth required to operate carriers in inner
channels and turning basins on the way to and at piers at shipyards is between 14 and
14.3 m (46 and 47 ft) depending on harbor salinity. Applying these requirements to
determine dredge depths requires additional port specific information. Appendix B
specifies the following:
"The dredging project depth can be traded off with tides to obtain the
necessary water depth in inner channels and turning basins with the
corresponding operational conditions." Therefore, planners should
consider channel accessibility and operational restrictions imposed when
selecting a design water level above the extreme low water. To facilitate
uniform application of the minimum water depth requirement in referenced
letter, formal criteria guidance is required.
"Shallower and/or narrow channels and/or higher speeds will require
greater allowance for squat." Since narrow channel widths and greater
speeds result in greater ship sinkage during transit (squat), and thus
deeper water, planners should also include these effects.
"Port specific fouling clearance studies can be performed if requested and
funded" to possibly reduce the 6.0 ft fouling clearance criteria. The
clearance criteria was derived from condenser fouling studies on
stationary ships berthed at NAVSTA Norfolk, VA in 1980. Locations that
exhibit more or less potential for fouling may require more or less
clearance to prevent it.