Irrigation practice and engineering by Etcheverry Bernard Alfred

Author:Etcheverry, Bernard Alfred
Language: eng
Format: epub, pdf
Tags: Irrigation
Publisher: New York, McGraw-Hill

FIG. 27.—Steel dam.

FIG. 28.—Steel dam with opening.

gator may handle as much as 3 to 4 second feet, distributed into 3 field ditches; 2 second feet represent more nearly the head of water which an average irrigator can handle. With a continuous flow of 2 or 3 cubic feet per second, two men each working 1/2 day will irrigate 8 to 12 acres; and with 4 cubic feet as much as 16 to 20 acres. The form and size of supply ditches and field ditches depend on the volume of water to be carried, the character of the soil, the grade of the ditch, the method of construction, and will be discussed in the following chapter.

The field ditches usually carry from 1 to 1 1/2 cubic feet per second. When placed across the slope, a flat grade is very desirable, in order to obtain an even overflow over the downhill bank when the water is checked at intervals. A minimum grade of 1/2 to 1 inch in 100 feet is sufficient; grades of 3 to 6 inches are more desirable and more generally used. When placed down

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