Preparing land for irrigation and methods of applying water . 4—~; Fig. 25.—Irrigating field strips. The sketch is taken from a 40-acre field in the vicinity of water from a pumping plant located on the northeast corner ofthe tract is delivered into a large cement standpipe 3 feet in diameterand about 7 feet in height above the ground level. This standpiperegulates the flow of water to the distributary and provides sufficienthead to force the water through the entire system of pipes. The mainunderground distributary is a cement pipe 10 inches in internal diam- U. S. Dept. of Agr., Bu
Preparing land for irrigation and methods of applying water . 4—~; Fig. 25.—Irrigating field strips. The sketch is taken from a 40-acre field in the vicinity of water from a pumping plant located on the northeast corner ofthe tract is delivered into a large cement standpipe 3 feet in diameterand about 7 feet in height above the ground level. This standpiperegulates the flow of water to the distributary and provides sufficienthead to force the water through the entire system of pipes. The mainunderground distributary is a cement pipe 10 inches in internal diam- U. S. Dept. of Agr., Bui. 145, Office of Fxpt. Stations, hngation Investigations. Plate Fiq. 2.—Distributing Water from Sections of Metal Ppe Attached to MainPipe by Canvas Elbows. 53 eter and is laid across the upper side of the field, as shown. Thecement stands are placed 10 rods apart, each thus serving a strip ofland containing about 5 acres. The metal pipes are first strung down the first strip, end to , then, at the stand, the first length of pipe is either joineddirectly to the stand by a right-angled elbow, as shown in Plate V, fig-ure 1, or the connection may be made by a short piece of canvas hosefrom 6 to 10 feet in length. Many prefer this latter method, as it givesgreater freedom of movement to the first two or three sections of pipeand also protects the cement stand from disturbance by careless han-dling. When the sections of pipe are jointed and extend nearly tothe lower end of the field, the water is turned in and the irrigation ofthe first strip begun. Many irrigators distribute the stream from themetal pipe directly. Others distribute by
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