I saw the thread 'Ask a Plumber' and since we also need water help outdoors where it doesn't rain consistently, I thought I would see if anyone here has irrigation related questions. The majority of my work is landscape irrigation and not agricultural or golf course in nature. I do work on fruit tree groves sometimes. I specialize in making old systems better by converting to low flow rotating sprinklers and drip irrigation. Also, I install smart (weather based) controllers that change the watering based on weather at your property.
Back in the 90's, I co-authored an irrigation design book to help solve some of the mysteries of how water works in pipes, valves and fittings so the installer will know how much water is available and what the pressure will be.
So, any sprinkler or drip design/ repair/ adjust/ upgrade questions, please ask away!
Here's that book with a couple of the tables from inside (sorry, it is now out-of-print):