The economical use of irrigation water is one of the chief problem of agriculture in arid region. Much more land is available than can be irrigated by the supply of water even then methods of greatest economy are employed. The total crop of arid regions is therefore limited not by land but by water and the welfare of the regions demand that the irrigation water be used as efficiently as possible.
Harris, F. S., "Bulletin No. 146 - The Irrigation of Wheat" (1916). UAES Bulletins. Paper 112.