TM 5-850-1
Table 2-1.
Diameter of Berth (in Yards) Using Ship's Anchor and Chain
Length of various vessels in ft
Depth of water in ft at MLW
100
200
300
400
500
600
700
800
900
1,000
10 ..........................................
165
235
300
365
20 ..........................................
205
270
340
405
470
540
30 ..........................................
245
310
380
445
510
580
645
710
780
40 ..........................................
285
350
420
485
550
620
685
750
820
885
50 ..........................................
325
390
455
525
590
655
725
790
885
925
60 ..........................................
365
430
495
565
630
695
765
830
895
965
70 ..........................................
405
470
535
605
670
735
805
870
935
1,005
80 ..........................................
445
510
575
640
710
775
840
910
975
1,040
90 ..........................................
480
550
615
680
750
815
880
950
1,015
1,080
100 ........................................
520
590
655
720
790
855
920
990
1,055
1,120
110 ........................................
560
630
695
760
830
895
960
1,030
1,095
1,160
120 ........................................
600
665
735
800
865
935
1,000
1,065
1,135
1,200
130 ........................................
640
705
775
840
905
975
1,040
1,105
1,175
1,240
140 ........................................
680
745
815
880
945
1,015
1,080
1,145
1,215
1,280
150 ........................................
720
785
850
920
985
1,050
1,120
1,185
1,250
1,320
160 ........................................
760
825
890
960
1,025
1,090
1,160
1,225
1,290
1,360
170 ........................................
800
865
930
1,000
1,065
1,130
1,200
1,265
1,330
1,400
180 ........................................
840
905
970
1,035
1,105
1,170
1,235
1,305
1,370
1,435
190 ........................................
875
945
1,010
1,075
1,145
1,210
1,275
1,345
1,410
1,475
200 ........................................
915
985
1,050
1,115
1,185
1,250
1,315
1,385
1,450
1,515
This table is based on the following assumptions:
(a)
Length of chain is equal to 6 times depth of water.
(b)
Anchor drags 90 ft from initial position.
(c)
Basic formula B = 2/3 (0.987 x 6D + L + C) for scope of chain of 6 times the depth of water. Correction to
scope to get radius of swing = 0.987. Where:
B = diameter of berth in yd.
D = depth of water in ft at MLW.
L = length overall of vessel in ft.
C = 90 ft allowance for drag of anchor.
(d)
To maintain scope of chain of 6 tines depth for rise in tide, add 2/3 (5.92 T) to berth diameter where T = height
of tide in ft.
Department of the Navy
2-3
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