UFC 4-150-06
12 December 2001
Entrance Channel Length. In order to safely negotiate the entrance
channel, vessels normally must maintain a higher rate of speed than is
required or permitted within a harbor. Thus, the entrance channel should
be of a length sufficient to allow vessels to reduce velocity before entering
the harbor proper. For vessels entering with speeds in the range of 5 to
10 knots, allow one vessel length of slowing distance per knot of entering
speed between the entrance and the turning basin. For medium-sized
vessels with no tug-assisted speed arrestment, a minimum of 1066.8 m
(3,500 ft) should be provided. CEM Section V-5 deals with the crucial
elements of channel design: width, depth and alignment. In addition, the
special requirements of entrance channels are discussed.
5-51
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