Cook Plant preoperational studies 1970 / John C. Ayers ... [et al.].

two miles overland in an exposed 2-foot-diameter pipe before going underground
at the lakeward edge of the sand dunes and into a pipe leading to the submerged
diffusing chamber. From the diffusing chamber the effluent is discharged at
7500 gpm through three nozzles spanning 90~ of arc between northwest and southwest. Each nozzle is directed upward from the lake bottom at 45~. The outfall
complex is at 14 feet of depth on Lake Michigan low-water datum.
These data were very kindly provided by Mr. Earl Watt of the Company.
They are very much appreciated, and our thanks to Mr. Watt are here formally
tendered.
On 23 October 1970 the temperature of the effluent water in the pipe was
measured through an opening in the pipe just before it went underground at the
lake edge. It was 20.7~C; the air temperature was 13.5~C; in its overland
extent the pipe had disposed of 6.0~C of temperature on this morning.
On the lake the wind was southeast at 5-10 mph; there were no large waves,
but long swells averaging about 3 feet in height were running from south to
north.
The outfall plume was located visually through a slight discoloration of
the water and a modification of surface roughness. Directly over the outfall
complex the water temperature was 12.7~C.
A parallelogram of measurement stations, arranged in lines parallel to
and perpendicular to the trend of the shoreline, was occupied; these stations
are shown in Figure 3. At each measurement station the ship was stopped and
a partial vertical profile of temperature obtained from a thermistor chain of
six YSI (Yellow Springs Instrument) Model 402 thermistors spaced one foot apart
on a weighted line and read with a YSI Telethermometer Model 44. In the first
lowering-position the thermistors sensed temperatures at 0, 1, 2, 3, 4, and 5
feet of depth; the whole chain was then lowered 6 feet and readings at 6, 7,
8, 9, 10, and 11 feet taken; usually the vertical soundings were stopped at

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