Two Well System ??'s

[gpick]

I have a well system which could be like that shown in your graphic  http://www.cyclestopvalves.com/simple/home.php?anim=2well  if I add a pump system to the second well.  The difference is that my wells would supply 3 buildings:  a 2 bedroom 2 bath house 1,000' feet from and 40' above the well head, a 4 bdrm 3 bath house 150' from and 15' feet above the wellhead and a barn with studio apartment and laundry room 400' from and 15' below the wellhead.

The current active well is 300', 50' static, and 15 GPM.  The other well is 200', 50' static and 5 GPM.   When water is on at the barn level there is very little pressure in the upper house.  Therefore, I was planning on using the second well to serve only the upper house and use the deeper well for the rest.  I have a Goulds 3/4 hp pump I was going to move to the shallower well and add a new Goulds 1 1/2 hp 10GS15412 for the deeper well.  Which would work the best -- two separate systems or one system with two pumps? 

Thanks in advance.

[Cary Austin]

I think the new 1.5 HP pump maybe all you need.  You need about 20 PSI extra to make up for the 40’ elevation to the house.  So you need to run a 60/80 pressure switch with a CSV set at 70 PSI.  Even in the shallow well the ¾ HP can only be turned up to about 30/50 if the well pulls down to 200’.  You can run a two well system this way but the ¾ pump will only help keep some water going at 30/50 when the 1.5 HP pump is not working.  If the 12 GPM from the 1.5 HP doesn’t keep up, you will need to put another pump this size in the second well to double the volume at the higher pressure