New Well and Pump - Low GPM ???? - Miscellaneous Items - SPRINKLER TALK FORUM

New Well and Pump - Low GPM ????

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rjhuss

Active Member

Posts: 9

Location: USA

Sunday, June 1st 2003, 10:04am

New Well and Pump - Low GPM ????

I just installed a new shallow sand point well ( 25ft). I used a 2" pvc point. On the surface I reduced the 2" pvc to 1.5" then connected a check valve and a union to the front of my pump.

The pump I am using is a Myers QP15 ( 1.5hp).

My configuration is almost the same as my Neighbors setup with the exception that he used a 2" check valve before he reduces to 1.5" for the pump.

This configuration for me is only producing about 10 GPM. My neighbor is getting about 18 - 20 gpm out of his setup.

All GPM measurments were done using a piece of 1" poly and a stop watch and 5 gal pail.

Does anyone have any idea's why my GPM is so low?
Could the size of the check valve make a difference?

Thanks for your help.

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Rays Sprinklers

Supreme Member

Posts: 493

Location: USA

Thursday, June 26th 2003, 11:04am

Hey,
Well if it is the EXACT same set up as your neighbor, than the aact that you reduced before the check valve then thats the reason for your lower GPM>>>>although 10 GPM is fine for a sprinkler system. Im not so sure about wells and pumps, but if its exactly the same without any other factors, than thats your reason!

Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers

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Warren

New Member

Posts: 2

Location: USA

Thursday, July 31st 2003, 2:56pm

RJ,
With regard to GPM's from any given well, there are several things to consider before you even reach the pump.

First is the underground source of water and how and where your point hits the source vs how your neighbor's hits the source. He may be in a much more porous location and is able to pul more water from the bed than you can is you are in a tighter material.

Second, the longer you pump a well, the greater the underground void around the point becomes. The larger the void, the greater the initial volume of water your well will product. Again, however, if the general layer of material you are in is less permeable, then you are bound to reach a less maximum constant GPM.

Third. Pure volume not dependent on the underground source is strictly a matter of pipe size and pressure applied. The smaller the pipe the less volume if the pressure remains a constant. So if you want the maximum volume you must have the maximum diameter pipe you can running into the pump. Any reduction in size prior to the pump will reduce the volume by default.

Warren