I use irrigation during dry periods. I use the poor boy methods as best I can.
I use the plain old aluminum 4 inch and 6 inch irrigation pipe. It is old. All of it was attained as used. Get some gaskets if you get used pipe. Gaskets are cheap and they are generally dry and cracked in the old pipes.
Most of the sprinkler impact heads that were replaced came off of ebay. Use minimum bids and take your time acquiring them. If they have small delivery jets you can drill them out to a larger size easily.
Your suction line has to be leak proof. You can only lift water approximately 20 feet (dpending on temperature). My pump sits on a temporary platform about 12 feet above the water.
I move the pipe when it is time to move. It is best to water at night to avoid excess evaporation. Small areas are covered with branches off of the main pipe using 2 inch lay flat connected to 2 inch PVC crafted spray risers. The 2 inch PVC is about 4 feet long with a tee in it then it reduces to 3/4 with a spray nozzle on top. I have approximately 1700 feet of pipe with spray nozzles and 800 feet of lay flat with about a dozen crafted nozzles.
During the extreme drought it cost about $35 a bale to irrigate based on fuel cost etc.
You can do calculations for volume, based on GPM, to get inches of water disbursed. I calculated how long it would take to water one premium coastal pasture with 1 inch and it came to 52 hours, based on pump delivery. The pipe had to be moved several times during that evolution.
Rain water has nitrogen entrained within it from the atmosphere. The nitrogen will disburse from the water in what chemist refer to as the "7-up effect" (decaying over time). Water in the river and creeks has already had its nitrogen decayed out of it unless it is fresh run-off. Generally when there is fresh run-off, you have no need to be irrigating in the first place. Anyway, irrigated water is not as good as rain for grasses. Irrigation sure as heck beats nothing. :lol:
If you would like more specifics PM me and I will reply as I get time. I can tell you how to build risers out of PVC pipe in detail. Lay flat hose is the cheapest route if you build the risers. Use the "inside couplings" from Lowe's with two hose clamps for the hose connectors (much cheaper) in between risers.