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Current Calculations
Example of
Current
Problems
In the following example, we will calculate the times of the minimum
currents and the times and speed of the maximum currents on the
morning of 8 September 1993 at a location known as Sewells Point.
All of the figures in these examples are excerpts from the Tidal Current
Tables.
OPNAV 3530/40 (4-73)
HT OF TIDE
Date
Location
Time
Ref Station
Step
Action
1.
2.
3.
4.
Enter the desired date.
Enter the location. Look up Sewells
Point alphabetically in the index to
stations. The index to stations is
located in the back of the Tidal
Current Tables. Find the index
number (#5121) for Sewells Point,
note this number because you will use
it in step 4.
Enter the desired time.
The reference station is found by first
finding our local or subordinate station
(Sewells Point) #5121, in table 2, and
then look in the center of the
DIFFERENCE column and follow it
upward to the line entitled "on
Chesapeake Bay Entrance p. 44."
Completed Strip
Form
08 SEP 93
Sewells Point
1100
Chesapeake Bay
Entrance p. 44
Figure 7-9. Excerpt from Tidal Current Tables.
7-19
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