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The first post

Monday, May 1st 2017, 10:50am

by WanderingNunican (Guest)

Drip and standard irrigation question

I have been running calculations for my new sprinkler system and I have what seems to be a very basic question that is answered nowhere on the internet.
I have a one acre lawn and will be pumping from a lake with a 2HP pump through a 2" poly mainline about 200' long. After running the numbers on the head required, etc, I have determined my flow rate to be in the neighborhood of 35 GPM and should have 35PSI at the heads. This is great for my rotors, but I would like to add a drip line or two for landscaping.
Here is my issue... my pump is moving gallons per minute and my drip emitters run in the neighborhood of a gallon per hour. I would need 2100 1 gal/hr emitters on the drip zone to make up the volume of water I'm pumping. Obviously nobody would do this this so I'm in the wrong somewhere. I don't want the pump cycling on/off, nor do I really want to be running a 2hp pump for an hour to water my garden (wasting electricity).
I suppose I could run the drip zones at the same time as I run other zones to fix this, but like I said, there is nothing on the google machine about this and I don't want to build and learn that I'm wrong. Perhaps everybody just uses spray heads on wells since the water is free? If I was on city water this would be a no brainer.....
Thanks for any and all advice!