Thanks for your post Teej, seems strange to me. Density and gravity are constant for the well, so we are left with depth. The water table of this well is affectively a constant for the moment. That leaves nothing. So any pump will do? Wouldnt the pump have to be strong enough to hold the weight of the prime? That weight is a function of height x width of the water column. If the pump cannot hold the prime it collapses and we have to start all over again.
Like I said, I am not an engineer, but I see two problems, one the weight of the water column, that I guess really isn't a problem, and the displacement problem of how much water is moved with each cycle.
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