. Bulletin of the Department of Agriculture. Agriculture; Agriculture. USE OF CONCRETE PIPE IN IRRIGATION. 49 a pressure gate that controls the height of water in the stand. This arrangement is applicable where there is a constant down grade. Where excessive grades are encountered, it is usual to use overflow distributing hydrants. In this case each hydrant relieves the 32.—Relief stand for preventing excess pressure on concrete pipe. sure at every tree row. It is not possible to pile up pressures that will exceed the height of the hydrants in this case, irrespective of the grade
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. USE OF CONCRETE PIPE IN IRRIGATION. 49 a pressure gate that controls the height of water in the stand. This arrangement is applicable where there is a constant down grade. Where excessive grades are encountered, it is usual to use overflow distributing hydrants. In this case each hydrant relieves the 32.—Relief stand for preventing excess pressure on concrete pipe. sure at every tree row. It is not possible to pile up pressures that will exceed the height of the hydrants in this case, irrespective of the grade of the feed pipe. There are three general types of overflow hydrants used and each type may have several modification?. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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