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MEASUREMENT OF FLOWING WATER.
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summary,
taken from the official records for the month of August for the years
1875 to 1882 inclusive. This month is taken as a dry month, as prior to
that time the numerous side streams swell the amount delivered at the
gauge:
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The
Eureka Lake ditch, with 2,500 inches turned in at the head, delivers at
the gauge, 33 miles distant, about 1,800 inches in the dry season.
The above statistics lead to the adoption of values of the co-efficient c, varying
from 31 to 45, in estimating the capacity of ditches* on heavy grades
of forty miles length flowing from sixty to eighty cubic feet per
second, such as referred to—that is :
The
loss incurred in the distribution of water is denoted by the following
figures, taken from the official records of two mining companies. The
amount received is measured at or near the distributing reservoirs; the
amount used, at or near the pressure boxes. The difference shows the
losses from leakage, evaporation, absorption, and wastage arising from
excess of constant supply over the amount needed, with interruptions
at the claim :
* These ditches are constructed on the rough mountain sides in rock more or less disintegrated.
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