Water temps at various depths

After reading some posts on water temps at different depths I fooled
around taking readings in my pond at different depths. In the middle
my pond is right at 21 feet. The temp at this depth is 61 degrees. It
stays at approximately this temp untill I get to 15 feet where it then
gets into the 70's. The temp gradually increases from 15 foot depth
and 72/73 deg until it hits approximately 4 feet of depth where it
gets into the high 70's. The water never gets into the low 80's
unless I am in the upper 6 to 10 inches of water. One inch of water
gives me a temp of 86 deg in the sun, with outside temp of 90 deg.
This is one reason I run my suction line for my fountain and aerator
pump etc from the deep section of the pond so I can shower the
shallower areas with colder water, and keep my overall temps at the
upper levels lower. I know just by waling around in the waters up to
you knees in the area aerated by the pump it is much cooler as
compared to walking around areas not aerated by the pump in other
sections of the pond.

I would assume the opposite would be true in winter...The warmer
(more uniform water temp) water would be deeper as compared to water
chilled by wind and lack of sun during winter.

I used an electronic thermometer and probe lowered into the water
while attached to a tape measure. I wll have to repeat this once it
gets into the winter season here and see just how low my bottom temp
is then as compared to the upper levels. I cana't vouch for the
accuracy of the thermometer but its sucessfully used for hatching oout
poultry etc so its pretty close..


Visit my website: http://www.frugalmachinist.com
Opinions expressed are those of my wife,
I had no input whatsoever.
Remove "nospam" from email addy.