. Farm development; an introductory book in agriculture, including a discussion of soils, selecting & planning farms, subduing the fields, drainage, irrigation, roads, fences, together with introductory chapters concerning farm business, and the relations of general science to agriculture . ifice would be cubic feet persecond or United States gallons (of 231 cubicinches). Usually the orifice is of fixed depth and ad-justable length. (See Figure 153.) The standard headof 6 inches (in sketch the head is marked by block B, 6inches long and tacked on side of box), or whatever headit m
. Farm development; an introductory book in agriculture, including a discussion of soils, selecting & planning farms, subduing the fields, drainage, irrigation, roads, fences, together with introductory chapters concerning farm business, and the relations of general science to agriculture . ifice would be cubic feet persecond or United States gallons (of 231 cubicinches). Usually the orifice is of fixed depth and ad-justable length. (See Figure 153.) The standard headof 6 inches (in sketch the head is marked by block B, 6inches long and tacked on side of box), or whatever headit may l)e, is maintained by the gate C. This gate isplaced securely in the ditch bank and raised or lowered * Trautwines Engineers Pocket Book. IRRIGATION 259 according as more or less water is being drawn abovethe orifice. The amount of water let through under theconstant head is regulated by the slide A shown inFigure 153. An acre inch means sufficient water to cover an acreof land an inch deep, and is 226,875 pounds, , or 886 barrels of 32 gallons each. Constructing farm supply ditches and field ditches.—The location and construction of ditches to carry thewater to the fields can be done with the reversible roadmachine, Fresno scraper, especially devised scrapers, the. Figure Sliiiwing plank sciiipei- in use, plneing tlie embEUilinient all on one siiieof the ililch. road plow, the common stubl)le plow, the spade andother suitable implements. In many cases the earthfrom the ditch can be made to serve as an embankmentin checking off nearly leyel fields or in terracing the hill-sides with slight fall so as to hold water in flooding. Locating field laterals.—In making shallow lateralsthrough the farm, and often temporary ditches throughthe fields, it is necessary to curve about small eleva-tions so as to have only very slight grade to theditches. 26o FARM DEVELOPMENT The biped level shown in Figure 158 is used in map-ping out field laterals around slight ele
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
