To irrigate land means to supply it with water in order to help crops grow. None of the water from Lake Powell is used to irrigate the area. + irrigation ir·ri·ga·tion The agricultural land is hilly and the irrigation poor
[ 'ir-&-"gAt ] (verb.) 1615. Latin irrigatus, past participle of irrigare, from in- + rigare to water; perhaps akin to Old High German regan rain; more at RAIN.