Column 17 is the shoaling coefficient K$2 related to the values of
(T^)2/d2 (Column 16).
Column 18 is H =
x Ks2 (product of Columns 13 and 17) .
Column 19 is obtained by using Equation 3-38
N = —
To
where + = R/Vc = — = 1.38 hours or 4,970 seconds.
F
26
Column 20 is H
= 0.707 H /log N\ H is from Column 18.
max s
After one line of computations across is completed, the next line is
begun, using F = Fz + AF <_ 137 where Y1 is from Column 14 of the
preceding completed line. For example, consider the line correspondmg to
X = 40 being completed. Then the computation for the next line X = 35
is as follows:
Fg = 66.4 from line X = 40, Column 14.
Column 6, Fc = 66.4 + 5 = 71.4 nautical miles for line X = 35 .
Compute
Column 7, Ho = 5.08 x/71.4' = 42.9 feet.
Column 8, To = 2.13 V42.9' = 14.0 seconds.
-.2
ri
i
T”
<14>
Column 9, =— = ------ =173
dr
113
rp2
Column 10, K, = 0.924 (Table 3-3) for values of =£ = 1.73.
dr
Column 11,
A = 3°4 H°
- (304 f42'9) (0-924)
(dr)’
ôïiF--------------- °'943 •
np2
Column 12,
lÿ = 0.89 (from Figure 3-35) for values of
= 1.73 and
d*p
A = 0.943 .
Column 13,
= Ho Ky = 42.9 (0.89) = 38.2 feet.
Column 14,
F,' =
"K
5.08
2
38.2~|2
5.08
— 56.6 nautical miles
J
3-68