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 Table 8. MOORING SERVICE TYPE III DESIGN WATER LEVELS
(in feet)
Extreme
Recommended
MHHW
MLLW
Avg.
Site
Extreme
Avg
Low
Heavy Weather
Yearly
High
Yearly
High/Low
Low
High
Bath, ME
8.7 /0.0 FEMA
Portsmouth
12.78
11.30
8.90
0.00
-2.50
-3.00
12.8 / -3.0
NSY
SUBBASE New
10.76
6.28
3.08
0.00
-2.30
-3.82
10.8 / -3.8
London
Norfolk NSY
8.85
6.15
3.15
0.00
-2.0
-2.40
8.9 / -2.4
NAVSTA
8.39
5.60
2.80
0.00
-2.1
-3.21
8.4 / -3.2
Norfolk
NAB Little
7.10
2.93
0.00
-2.50
7.1 / -2.5
Creek
Newport News
8.39
3.15
0.00
-3.21
8.4 / -3.2
Ship Building
SUBBASE
9.11
7.04
0.00
-2.22
9.1 / -2.2
Kings Bay
NAVSTA
7.50
6.40
4.92
0.00
-2.0
-3.20
7.5 / -3.2
Mayport
1.78
0.00
-3.57
? / -3.6
NAVSTA
6.13
Pascagoula, MS
(1980-
1986)
NAVSTA
16.15
1.44
-0.25
16.15 / -0.25
Ingleside, TX
NAVSTA
14.35
13.31
11.11
0.00
-
-3.60
14.4 / -3.6
Everett
SUBBASE
14.67
13.33
11.13
0.00
-
-3.79
14.7 / -3.8
Bangor
Puget Sound
15.40
13.94
11.74
0.00
-3.90
-5.00
15.4 / -5.0
NSY
NAS North
8.35
7.50
5.73
0.00
-2.0
-2.88
8.4 / -2.9
Island
Pearl Harbor
3.51
-
1.95
0.00
-
-1.47
3.5 / -1.5
NSY
Yokosuka
7.15
0.00
7.15 / 0.0
JAPAN
GUAM
2.4
0.00
4.7 / 0.0
1) Tidal benchmarks are from NOAA http://www.opsd.nos.noaa.gov/bench.html
2) Avg yearly high water and low water is from "Shore Protection Manual," USACE, 1984.
3) Extreme high values are from observations. For Norfolk, water levels above MLLW (assuming storm surge
occurs at MHHW) are: 7.9 ft = 20 year storm; 8.9 ft = 50 year storm; and 9.8 ft = 100 year storm.
19
NFESC TR-6012-OCN Rev B
U.S. NAVY HEAVY WEATHER
MOORING SAFETY REQUIREMENTS
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