6/17/2011 1:06 PM
We use a portable Water Level Sounder, brand is Powers Electric Products. 100' depth one is PWS-100F for $310, goes up in price a little per hundred more. Works great, drop it in and once it touches water it sends a current, we then mark and use a roll tape to measure depths. We have to do weekly readings from April-Oct, off times its once a month.