Water-supply Paper, Bände 341-342

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U.S. Government Printing Office, 1915
 

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Seite 54 - ... year. 1 foot equals 0.3048 meter. 1 mile equals 1.60935 kilometers. 1 mile equals 5,280 feet. 1 acre equals 0.4047 hectare. 1 acre equals 43,560 square feet. 1 acre equals 209 feet square, nearly. 1 square mile equals 2.59 square kilometers. 1 cubic foot equals 0.0283 cubic meter. 1 cubic foot of water weighs 62.5 pounds. 1 cubic meter per minute equals...
Seite 54 - States gallons per second; equals 448.8 gallons per minute; equals 646,317 gallons for one day. 1 second-foot for one year covers 1 square mile 1.131 feet or 13.572 inches deep. 1 second-foot for one year equals 31,536,000 cubic feet. 1 second-foot equals about 1 acre-inch per hour.
Seite 161 - River almost exactly on the Arctic Circle and about 25 miles directly west of Fort Yukon. Its mouth is about 5 miles west of the confluence of Chandalar River with the Yukon. The drainage comes almost entirely from the south and west through a complex system of watercourses, and in outline the basin is extremely unsymmetrical. The headwaters interlock with those of Little Chena and Chatanika rivers and flow...
Seite 499 - ... proceeds rather slowly, for otherwise precipitation will occur later in pipe lines or in boilers. FEED-WATER HEATING. Water heaters are designed primarily to utilize waste heat in stationary boiler plants by raising the temperature of the feed water and thereby lessening the work of the boilers themselves, but tì\oy also effect some purification, and many heaters have been specially designed with that end in view.
Seite 480 - ... operation. If it is desired to compute the scaleforming ingredients of waters whose analyses in this report give no values for silica, iron, or aluminum, Cm may be taken as 20 without introducing great error. In clear waters suspended matter (Sm) would of course be zero; and consequently for most Georgia ground waters the amount of scale may be estimated practically from the figures representing silica, calcium, and magnesium. Suspended matter can not, however, be disregarded in estimating the...
Seite 488 - Many open dug wells and many pits constructed as reservoirs around the tops of casings are exposed to fecal contamination from above or through cracks in poorly built side walls. Care should be taken that the casings of deep wells do not become leaky near the surface of the ground so as to allow pollution to enter. As a matter of ordinary precaution the ground should be kept clean and water should not be allowed to become foul or stagnant near any well, no matter how deep. If shallow dug wells are...
Seite 488 - If shallow dug wells are necessary they should be constructed with water-tight walls extending as far as practicable into the well and also a short distance above ground. The floor or curbing should be water-tight and pumps should be used in preference to buckets for raising the water. Every possible precaution should be taken to prevent feet scrapings and similar dirt from getting into the well.
Seite 498 - Softening. The principal objects of water softening are to remove the substances that cause incrustations in boilers, particularly calcium and magnesium, and to neutralize those that cause corrosion. Chemicals of known strength properly dissolved in water are added to the raw supply in such proportion as to precipitate all the dissolved constituents that can be economically removed by such treatment. The water is then allowed to stand long enough to permit the precipitate to settle, after which the...
Seite 74 - Macon County. WILCOX FORMATION1 The Wilcox formation outcrops in a belt extending northeastward from the vicinity of Fort Gaines on Chattahoochee River probably to Flint River in the northeastern part of Sumter County; east of the Flint it has not been certainly recognized. The width of the outcrop is believed to average not more than 5 or 6 miles. The formation is...
Seite 122 - ... the well. 5. A suitable exposure of the edge of the porous stratum, so that it may take in a sufficient supply of water. 6. An adequate rainfall to furnish this supply. 7. An absence of any escape for the water at a lower level than the surface of the well.

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