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given that it could be as far as 620 ft, I kind of doubt that would work. Also, there will be a lot other stuff in the well casing, I'm not even sure there is clear sight of the bottom.
yes but
a) submarine sonar is very powerful - it can kill marine life. Pricey even if not restricted.
b) submarines don't try to shoot the beam down a 1.5" pipe.
the resistance idea is on a sound theoretical basis but has lots of practical complications: corrosion, differing conductivity of the water over time and mechanically maintaining the distance between the wires in a 1.5" pipe while avoiding contact with the metal shaft. If one was willing to attempt that, a better solution would be measuring capacitance between two sealed wires. However keeping the wires at a uniform distance over a 600' height is just not practical.
Personally, I think measuring the head pressure while pumping is the best solution. it does mean that you can't monitor on a minute by minute basis but don't think it's all that valuable. I think you can derive all the info you want from that data. To get minute-by-minute data with the pump off, the bubbler is the best solution.
I have also considered trying to capture neutrino flux markers and calculate the volume of the water. With a known diameter of 6" - the volume of equipment/pipes/wires embedded a fairly accurate number can be derrived.
I actually put my location in the post just before yours. I am in Anacortes. I am on a part with no aquifers per se. It is a fairly large area on the South end.
Since the airflow in the tube will be low, I would consider decreasing the diameter to attain the pressure rating you need. McMaster-Carr has a nice variety of nylon tubing available at less the $0.25 per foot. See: mcmaster.com
John
Yes, just what i was about to suggest.
Thinner tubing can handle much higher pressures,
but if you go very thin the response time will be increased.
Less than a quarter of an inch will take quite a while to squeeze
out the water to get an indication.
Unless you leave it bubbling all the time i suppose.
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