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I have 6 inch borewell of 1200 feet (domestic use). With camera test, we could see water storage is at 960 feet. i.e approx storage of 200 feet. i.e around 1000 liters. my question is, can we put motor? will it work? What happens if we pump and water is just enough for pipe above? after we stop motor, will it discharge water back or will it hold in pipe and next pumping will push out?

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  • $\begingroup$ i am referring to submersible pumps. texmo. $\endgroup$ Aug 29 '17 at 8:09
  • $\begingroup$ Make sure you've observed the lowest water level over at least a full year's weather cycle before placing the pump (unless you are going to place it at the bottom of the bore hole) $\endgroup$ Aug 29 '17 at 13:04
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You cannot possibly use any pump with suction at that depth. You must have a multistage submersible pump. This would be a small ESP in the oil industry where liquids are pumped from as deep as about 15,000 ft with over 100 pump stages. A good domestic water well company will have some applicable pumps and check valves. You will need some serious electric power and equipment to install and recover the pump for service. You may need "pump off" control to shut off the pump when the water level drops too low and other things . It sounds like you need an actual engineer to set it up.

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You should be able to find submersible motor / pumps for this and most, if not all, will have a one way valve to stop the backflow, this means delivery is quick when the motor is turned on.

You just need to source one that will work at the pressure created by the depth.

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    $\begingroup$ To clarify: if the lowest standing water level is X meters below ground level, then place the pump at (X+2) meters down and the pump must support (X + 2 + 'spare') meters of pressure. That is, if I understand the layout correctly. $\endgroup$ Aug 29 '17 at 13:02
  • $\begingroup$ That also depends on the suction head the pump is capable of ... $\endgroup$
    – Solar Mike
    Aug 29 '17 at 14:04
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    $\begingroup$ The OP commented that he's using a submersible, so suction head won't matter (unless things really go wrong) $\endgroup$ Aug 29 '17 at 15:44
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Place a retaining valve and the water will stay in the pipe.

enter image description here

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  • $\begingroup$ where does this valve go in relation to his submersable pump? $\endgroup$
    – agentp
    Oct 28 '17 at 13:42
  • $\begingroup$ on the lhs of the pipe - effectively under the word "place"... $\endgroup$
    – Solar Mike
    Oct 28 '17 at 14:30
  • $\begingroup$ it doesnt help to hold the water column above the pump. $\endgroup$
    – agentp
    Oct 29 '17 at 13:15
  • $\begingroup$ On my situation I have the start pipeline ------------- Valve - pump ------------- collector arranged in this order ("----" symbolizes pipe) $\endgroup$ Oct 30 '17 at 13:39

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