Geological Survey Circular, Bände 20-24

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Geological Survey, 1949
 

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Seite 44 - ... the number of gallons of water a day, at 60° F., that is conducted laterally through each mile of the water-bearing bed under investigation (measured at right angles to the direction of flow) , for each foot of thickness of the bed, and for each foot per mile of hydraulic gradient (Meinzer's coefficient: see Stearns, 1927, p.
Seite 54 - The conductance varies with the concentration and degree of ionization of the different minerals in solution and with the temperature of the water.
Seite 58 - Nitrate in water may indicate previous contamination by sewage or other organic matter as it represents the final stage of oxidation in the nitrogen cycle. The quantities of nitrate usually present in surface waters...
Seite 58 - The reported quantity of dissolved solids- -the residue on evaporation -consists mainly of the dissolved mineral constituents in the water. It may also contain some organic matter and water of crystallization. Waters with less than 500 parts per million oí COMPOSITION OF SURFACE WATERS 15 dissolved solids are usually satisfactory for domestic and some industrial uses.
Seite 44 - Methods for determining permeability of water-bearing materials: US Geol. Survey Water-Supply Paper 887, pp.
Seite 58 - ... as dissolved solids (the residue on evaporation) consists mainly of the dissolved mineral constituents in the water. It may also contain some organic matter and water of crystallization. Waters with less than 500 parts per million of dissolved solids are usually satisfactory for domestic and most industrial uses. Waters with more than 1,000 parts per million of dissolved solids are likely to be unsuitable for most domestic and industrial uses.
Seite 59 - Hardness between 50 and 150 parts per million does not seriously interfere with the use of water for most purposes, but it does slightly increase the consumption of soap, and its removal by a softening process is profitable for laundries or other industries using large quantities of soap.

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