Public Water-Supplies : Requirements, Resources, And the Construction of Works

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Public Water-Supplies : Requirements, Resources, And the Construction of Works
F E Frederick Eugene Turneaure
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Health, Report for 1892. p. 555.
Digitized by Google 480 SLOW SAND FILTRATIOI^.
The loss of head in the gravel can be kept low either by means of a thick layer, or by putting the drains close together. Wide spacing requires fewer drains, but larger sizes and more gravel. When the cost of drains and gravel is known, the most economical arrangement for a given loss of head can be determined by a few trials.
Thus with a rate of 3 million gallons per acre per day (equal to about 75 gallons per squa
...re foot per day), and drains 20 feet apart, the total flow through each foot of width of gravel will be 10 X 75 = 750 gallons. With 6 inches of 20 mm. gravel the average flow per square foot will be 2 X 750 == 1500 gallons, and by the above table the loss of head is seen to be about .00037 foot per foot. The average distance travelled is 5 feet, hence the total loss of head in the gravel will be .0018 foot. This is a very small loss and would usually be much smaller than necessary. A still thinner layer of gravel might therefore be used, or the drains placed farther apart.

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