In these years, too, owing to the extension of drainage works, the irrigable area of Egypt was greatly enlarged, so that if perennial cultivation was at all to be increased, it was necessary to increase the volume of the river, and this could only be done by storing up the flood supply.
In the Terrenos de secano, or non-irrigable districts, the average price of an acre ranges from £7 to £17; in the Terrenos de riego, or irrigable land, it ranges from boo to £250.
The Irrigation Commission of 1901 advised an expenditure of 30 millions sterling, spread over a term of twenty years, and irrigating 62 million acres in addition to the 47 millions already irrigated at that time; but it was estimated that that programme would practically exhaust the irrigable land in India, and that some of the later works would be merely protective against the danger of famine, and would not be financially productive.
The irrigable area of Wyoming is estimated at about 6,200,000 acres, lying chiefly in Bighorn, Sheridan and Johnson counties in the N.W.
It has been estimated that the irrigated and irrigable area under private canals is about 80,000 acres, and that that still undisposed of in 1909, irrigated by the state under the Carey Act, amounted to 180,000 acres.