not a well expert by any means, but the first thought that comes to mind is keeping the end of the
feed pipe off the bottom of the well
other thoughts...
use a laser measuring device? of
course you'd have to build a bracket for it so the light reflects off the
water and not the casing
a float, a string, a pulley and a weight: tie a float to a string and drop it in the well > the string comes out of the well casing and is run through a pulley > the other end has a (small) weight on it and acts as a gauge
i'm guessing that if the float were the right size and shape, it wouldn't hang up on any of the well plumbing
if you have any really small children... never mind... bad idea
it's late and my mind is working in very strange ways, which is why i must have thought of this [brilliant] idea...
you need a blower, a laptop and a microphone - the blower blows air across the top of the well head > the microphone picks up the tone > the laptop determines the frequency of the tone and, with that, you know how much of the well casing is empty LOL
