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Ch. 9: Measurements of FLowin Water

Ch. 9: Measurements of FLowin Water Page of 331 Ch. 9: Measurements of FLowin Water Text size:minus plus Restore normal size   Mail page  Print this page
Ditches in California.—In the mining districts of California ditches are constructed boldly, with steep grades and on irregular lines with numerous sharp curves. The cross sections, originally uniform, become more or less varied. Absorption, percolation, evapora­tion, and leakage reduce the flow. A distinct, reliable factor for each of these sources of loss cannot well be in­corporated in the coefficient of discharge. If, then, it is intended to cover all of these common sources of loss by such a coefficient, its value must be a material modifica­tion of values commonly given in the text books. It would be certainly an affectation of accuracy to apply so complicated a formula as that of Kutter in such a case, since the modifying conditions, which can be estimated but roughly, call for a large reduction of the calculated result. This will be apparent from the measurements of discharge given further on. The simple formula, expresses more fitly the result of experience in such cases, wherein—
Q is the quantity of water which the ditch is capable of carrying in cubic feet per second.
a the effective area of cross section of ditch, as origin­ally constructed, in square feet.
Ch. 9: Measurements of FLowin Water Page of 331 Ch. 9: Measurements of FLowin Water
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