TR No. 22 
¥\. = the number of impeller rotations from the start of the 
run to time tos 
J = time from the start of the run to the start of the kth 
k 
sample; 
NM, = the number of impeller rotations from the start of the 
s run to time +, . 
If the average current from ty tot is U (meters-sec”+), then the 
position of the kth sample relative to the channel buoys is 
X, (meters) = U(4,-% ) + 0.1461 Cn =Op). 
Accurate measurements of U, over the distance between Stations I and 
II were not available. However, a large error in Ue does not result in a 
corresponding large error in x,; for 
a le (0. 146!) = pele 
CC) 
Thus: 
x L : e é 
Xie = (Nip uae) | i+ me xX, ia 
If a value of 1/2 the current through Station I is used for U., and 
if this value is in error by 150%, then 
a> oe 
= han = OK /4 ( 1008 } = t8.4%, £12.5%. 
mR pt 08/4 
Table 3 gives the positions of the samples relative to the channel 
buoys as determined from 
= + 
x, = 008 (th - t,) 0.1961 (N, - n) 
and are assumed to be correct to within around 10%. 
17 
