UFC 4-159-03
3 October 2005
Table 3-5. Facility Design Criteria for Mooring Service Types
MOORING
WIND*
CURRENT**
WATER
WAVES
SERVICE TYPE
LEVEL
N.A.
TYPE I
Less than 35 knots
1 knot or less
mean lower
low to mean
higher high
P=1 or
TYPE IIA
Vw=50 knots (max.)
1.5-knot
extreme low to
R=1 yr
max.
mean higher
high
P=1 or
TYPE IIB
Vw=64 knots (max.)
2.0-knot
extreme low to
R=1 yr
max.
mean higher
high
P=0.02 or
TYPE III
P=0.02 or
P=0.02 or
extreme low to
R=50 yr
R=50 yr
R=50 yr
mean higher
high
TYPE IV
P=0.01 or
P=0.01 or
extreme water
P=0.01 or
R=100 yr
R=100 yr
levels
R=100 yr
*Use exposure D (UFC 1-200-01 Design: General Building Requirements; flat,
unobstructed area exposed to wind flowing over open water for a distance of at least 1
mile or 1.61 km) for determining design wind speeds. Note that min. = minimum return
interval or probability of exceedence used for design; max. = maximum wind speed
used for design.
**To define the design water depth for ship mooring systems, use T/d=0.9 for flat keeled
ships; for ships with non-flat hulls, that have sonar domes or other projections, take the
ship draft, T, as the mean depth of the keel and determine the water depth, d, by adding
0.61 meter (2 feet) to the maximum navigation draft of the ship (note, may vary
depending on sonar dome size)
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