Journal of electricity, power, and gas . Vol. 44. pp. 267 to 281) and & I. No. 200, p. 88.) The limiting head obtainablein each case was, however, less than 6 ft. and thelength ft. The curves were plotted carefully and passedthrough the points accurately, and assuming that thecurve, becomes a straight line from 6 ft. on the quan-tity per foot was obtained at a head of 15 ft. for eachsection, call it q then the length necessary to carry200,000 sec. ft. would be 200,000 -=- q — 1. The sectionNo. 1 and No. 2 give the greatest q or least L. q=194 sec. ft. — h= 15 ft., L= 1032 ft. This as
Journal of electricity, power, and gas . Vol. 44. pp. 267 to 281) and & I. No. 200, p. 88.) The limiting head obtainablein each case was, however, less than 6 ft. and thelength ft. The curves were plotted carefully and passedthrough the points accurately, and assuming that thecurve, becomes a straight line from 6 ft. on the quan-tity per foot was obtained at a head of 15 ft. for eachsection, call it q then the length necessary to carry200,000 sec. ft. would be 200,000 -=- q — 1. The sectionNo. 1 and No. 2 give the greatest q or least L. q=194 sec. ft. — h= 15 ft., L= 1032 ft. This assumes aconstant coefficient from 6 ft. on up which may or maynot be true. Now consider the problem from the other pointof view (see Table 2). The columns headed h and Qper ft. are taken directly from the experiment as tab-ulated ; the column H is the head over the proposeddam or 15 ft.; the column Ratio n is obtained byconsidering the 1 ft. model with its head h and en- March 28, 1914.] JOURNAL OP ELECTRICITY, POWER AND GAS 271. Pig. 1. Comparison of Different Water Power Fees Charged by the Departments Having Jurisdiction. H larging it n times or — times; it also is the length of hthe model; the column headed Q shows the quantityflowing over the model nh feet deep and n feet long,and is found by Q = qnr/2; and finally the last columnis the length of the proposed dam to carry 200,000 15 ft. high. Computations for the Quantity Over a Model DamProportional Method vs. Direct Experiment. TABLE 1. Experi by the Head Correctedtaken as Head onUnit and Weir menTabulated tal5 ftper 1 ft. Dis ComputedDischarge 5 Error h = .5907 q = h= .6305 q = h. .9S61 n—H/h. , , u— Crest for «=qxn— Per 2 27,12 H. =Q,xl
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