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Message: <blockquote data-quote="Allen" data-source="post: 492217" data-attributes="member: 389">One last thing.  There is a limit to how deep one can go and pull water with a suction pump.  In theory, you can pull water from a standing water surface to a depth of about 33.9 ft.  In reality, that wouldn't produce much water because eventually you would cause the water to boil when attempting to pull it up from much more than about 25 ft.  If your pump is capable of producing that much vacuum, it can be very hard on the screen, pump, etc.   Remember, it doesn't matter how deep the well is screened, this part is all about transmissivity of the geologic medium and the depth to the standing water level in the sand point. Basically, if I were in your shoes I would aim for a total depth of 23 ft, this would put the standard 3 ft screen at a depth of 20-23 ft.  If your water table is indeed at 15 feet, that should suffice to operate a sand point if you have good sand and gravel.  Once you install the screen, wait a few hours and figure out how to measure the water surface in the well casing.  One trick I have used is a weighted, narrow bobber and a fishing rod.  You drop the bobber down inside the pipe and you should be able to feel when the bobber hits the water. [ATTACH=full]85567[/ATTACH]Using the above style, you would want to also tie the string to the top of the bobber. Or tape the string to the bobber. I have faith that you will figure it out.  You just wouldn't want to be pulling on the bottom of the bobber, or there's a chance it will get stuck as it turns sideways when you try to pull it back out.If you can't get production at that screened interval, try driving it deeper to see if you can get into a cleaner sand/gravel layer.  The only limitation here is how deep you can physically drive the sand point.  There are some nuances to this, but the point here is that even if the water table is at 15 feet, that doesn't mean the geologic medium is permeable enough to produce the pumping rates you desire.  That clay smear on the screen is real in some areas, and obviously it's very difficult to install a production well in a clay rich layer. Fun project!</blockquote>

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