Thats the nice thing about have a ball valve on the water line you can adj. it to where the water lever quits dropping, then time it to see how long it takes to fill up a five gal bucket, then you know how many gpm your well will make. some well will drop the water lever 5, 10 , 20 feet then stop dropping and hold that lever while they pump, what I alway did was start out slow so I wouldn't pick up a lot of crap and jam the pump, then open her up and pump full bore if the water droped to the bottom of the well I would start closeing the ball valve to where the water lever start to hold it's own then i would time it to see how long it took to fill a five gal bucket. good luck.
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