View Full Version : sprinkler job

02-25-2006, 06:04 AM
Hello every one I'm helping a friend with his sprinklers. He has a house in 2.5 acres. He has a 3hp goulds centrifiagal pump pulling from a pond with a lift around 15' on a 2" intake. We are going to use six zones useing mostly big heads(rainbirds) that are rated to spray 45' at 10gpms. We are planning on the discharge side to come out from the zone valve with 1 1/2" for a 100' feet and then reduce to 1". One of the longest lays will be around 300'. Will this work or will we have to make some adjustments


02-25-2006, 07:25 AM
Are you saying these heads use 10 gallons per minute? I'm not sure what gpms means. That's a pretty big head.

You should get ahold of a friction loss chart and figure your gallon per minute usage per zone and size the pipe accordingally. Use the words "Friction loss chart" in Google.

It will be useful to know what this Goulds pump can do with a 15 foot lift at around 40 psi. There are medium and high head pumps, and they both pump differently.


Gary Swart
02-25-2006, 06:14 PM
Consider this. Go to an irrigation supply house and see if they have designers on staff or that they contract with. Have a good scale drawing with you. When I did this for my yard system, the designer took my drawing and laid the entire system out including pipe sizes and sprinkler sizes. This service was free on condition that I would purchase all of my supplies for the job from them. Even if you had to pay for this, in my opinion it would be worth a lot with so many variables to take into consideration.

03-01-2006, 10:55 AM
Oh its very interesting. Could you provide me more information ?