Studies on water movements and sediments in Southern Lake Michigan : part 1[-3] ... / by John C. Ayers.

RESULTS
Current Studies
Studies in the Chicago Region
Our studies in the Chicago region were in large part
centered around 41050.01 N, 87~30.0' W near the site of the
diffuser proposed by the lakes states in the recent Chicago
litigation. Their primary purpose was to provide information
on the direction of currents under various winds.
Drogue run, 28 April 1963 (Fig. 1): A surface drogue and
a 44-foot drogue were set at 41~50.6', 87029*5'. The deep
drogue apparently went aground promptly, for it made no movement in two-plus hours. It is not shown in Figure 1.
The surface drogue moved due west a distance of 3200 feet
in 2 hours 16 minutes, giving an indicated current velocity of
0.27 mph.
The wind regime of the 26th through the 28th was:
26 Apr. E 10-12 knots
27 Apr. AM SE 7k
PM NE 13 k
28 Apr. AM SE 10 k
PM ENE 15 k
Drogue run, 4-7 June 1963 (Fig. 2): Four radio drogues
were set near the diffuser site on 4 June. During 5 June,
while the ship was detained in Chicago harbor, the drogues
could be heard distinctly. During the position fixing of 6
June and the recoveries on 7 June the ship homed on the
drogues by radio and found them readily.
Drogues I and II were set at 0804, but drogue I (set for
43 feet in charted depths of 48 feet) did not move and was

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