Plate 6



   It is not sufficient merely to conserve water; water must be controlled for effective use. Lockpipe valves (see also Plates 22 and 23) and drains for water conservation and irrigation (see also Plates 8 and 9) provide this control and facilitate the movement of large quantities of water both economically and profitably. Pictures are of irrigation drains on "Yobarnie". Each is flowing at the rate of over 100,000 gallons an hour.