There is a lot of math involved to give an answer, and I had the same question over 2 months ago and got the answer quickly by AI. I've used Drip irrigation for several years and always used my best guess and some lines failed to preform from overextending the limits. This year I standardized my lines and used AI to calculated my new set up. The math required the pressure regulator PSI I was using, the gallons of water per minute available before the regulator and the line pressure to the regulator to start and then the line lengths, emitters GPH, and so on.

ask AI and you will eventually get the correct answers. AI even calculated the amount of water applied per square foot, how far it would peculate down and wick sideways and estimate how long to run it based on my soil type. AI will prompt your for information so give it a try.

I do love my drip lines. 0.7 gallons per hour, no wasted water, no hoses to pull around, even watering and all I need to do is switch a few valves.

Thanks. How do you do .7 gph ?

i see the minimum emitters available are 1 gph.

I had asked the AI. It had a great suggestion to install on off buttons per quarter inch line. I will be doing that but i am thinking if i should instead add the on off button for the half inch lne but it could be difficult to insert for the half inch line.

Joypdx, The 0.7 gpm emitters are built into the inside of the 1/4" tubing I use that are spaced 6" apart or 12" apart, it comes in 50' rolls for $15, and 50' is the absolute limit for one off a 1/2" tubing. A roll spaced 6" apart is 100 emitters. I have 1 gpm, 2 gpm and adjustable individual emitters to pierce into 1/2" tubing but found the 1/4" tube with embedded emitters is much easier for rows.

Each row is valved on/off from a main line and run three main lines and I select which one I want to run, only one will run otherwise it will overload water volume and pressure, but works for me. You can buy 1/2" tubing in 500' rolls for about $50 and the best bargain. 1/2" Valves can be found on Amazon for less than a buck each and work until they don't but I've only had one leak. Tee's, elbows and other fittings are cheap, about $12 in 25 and 30 packs so I can put many on/off valves without breaking the bank.