4 DEPARTMENT BULLETIN 1110. 
shown in the figure. At the same time the gauge readings on the 
crest were taken to the nearest one-sixteenth of an inch, with an 
ordinary carpenter’s folding rule held vertically at the center of the 
flume and on the upstream edge of the crest. All the weir bulkheads 
were made of 2-inch material, having the upper edge or crest planed 
straight and at right angles to the side. Both corners of the crest 
were slightly rounded with sandpaper in order to approach field 
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Fiac. 2.—The farmer’s short-box measuring flume, used at the Fort Collins laboratory. 
conditions as nearly as possible. The discharge for each test was 
determined volumetrically in the calibration tanks at the laboratory. 
In all, four sizes of flumes, each with four heights of crest, were 
calibrated. The flumes were 1, 2, 3, and 4 feet in width and the 
weirs were nominally 4, 8, 12, and 16 inches in height, but by meas- 
urement were found to be 344, 74, 10%, and 14;% inches, or 0.307, 
0.594, 0.907, and 1.203 feet, respectively, in height. The thickness 
of the crest was in all cases 1;% inches. For each width of flume and 
