The California fruits and how to grow them; . te, gallons per hour, 12, gallons 212 CALIFORNIA FRUITS: HOW TO GROW THEM per day; cubic foot per second, cubic feet per minute, 72cubic feet per hour. One acre-inch of water (that is, 1 inch indepth over an acre of surface) equals 27,152 gallons, or 3,630cubic feet, and 1 miners inch will supply this quantity in hours. Thus a simple calculation shows that a little streamof 5 miners inches will supply enough water to cover an acre deep in about 23 hours—a fair amount for one irrigationof soil of average cha
The California fruits and how to grow them; . te, gallons per hour, 12, gallons 212 CALIFORNIA FRUITS: HOW TO GROW THEM per day; cubic foot per second, cubic feet per minute, 72cubic feet per hour. One acre-inch of water (that is, 1 inch indepth over an acre of surface) equals 27,152 gallons, or 3,630cubic feet, and 1 miners inch will supply this quantity in hours. Thus a simple calculation shows that a little streamof 5 miners inches will supply enough water to cover an acre deep in about 23 hours—a fair amount for one irrigationof soil of average character if it has not been allowed to becometoo dry before the application. In fact this is an average amountactually used for an irrigation of shallow-rooted plants like mostfield and garden crops. Weir Measurement.—The term weir is not always understoodby those who use it. The term can properly be used only forstructures designed to allow the water to flow over the crest witha considerable fall on the down-stream side. There are a large. Weir box in operation showing post from which to measure depth of stream. number of forms of weirs, taking their names from the shape ofthe weir notch, or the form of crest. The triangular weir has aV-shaped notch. The rectangular weir has a horizontal crest withvertical sides. Both of these forms of weir are good, when usedby the expert irrigator or engineer who understands the principlesand factors which enter into their calculations. In order to avoidthe variable factors which enter into the calculations for the flow WEIR MEASUREMENT 213 of water over weirs, Cipoletti invented the form of weir whichhas taken his name and which is in general use throughout theirrigated sections of the world. The Cipoletti Weir.—The Cipoletti weir has a thin horizontalcrest, the sides of the weir notch sloping back from the verticalat an angle equal to one inch in horizontal for every four inchesin vertical. This, for each additional inch in depth the w
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectfruitculture, bookyea
