Irrigation was a technique for distributing water.
While on Amerind, James T. Kirk proposed a system to irrigate the local fields and double the food supply. It would depend on a canal bringing water from a lake to the lodge. (TOS: "The Paradise Syndrome")
In 2370, Kira Nerys discussed irrigating the Trilar Peninsula with Minister Rozahn for an entire day. She was surprised that Benjamin Sisko knew, but he explained that he'd overheard her shouting at a monitor for the last two days. (DS9: "Sanctuary")
While acting as a priest in the Fair Haven holoprogram, The Doctor told a story about two feuding farmers, one of which at one point clogged an irrigation ditch belonging to the other. (VOY: "Spirit Folk")