Manual of military engineering . 4eld of a stream may be measured asiiient ot follows :—Select some 12 yards or 15 vards of the stream ..; ... where the channel is fairly uniform, and there are no the breadth and average depth in feet in three or fourplaces. Drop in a chip of wood and find the time it takes totravel, say, 30 feet. Thus obtain the surface velocity infeet per second. Four-fifths of this will give the mean velocity,and this multiplied by the sectional area in square feet willgive the yield per second in cubic feet of water. quantityivquiivd yield. rCucteGJ LATRI
Manual of military engineering . 4eld of a stream may be measured asiiient ot follows :—Select some 12 yards or 15 vards of the stream ..; ... where the channel is fairly uniform, and there are no the breadth and average depth in feet in three or fourplaces. Drop in a chip of wood and find the time it takes totravel, say, 30 feet. Thus obtain the surface velocity infeet per second. Four-fifths of this will give the mean velocity,and this multiplied by the sectional area in square feet willgive the yield per second in cubic feet of water. quantityivquiivd yield. rCucteGJ LATRINES. S 0 3 0 rr -^ . 4-. M 38 Z ss J-^
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