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 



PLAN 



^x^^^^m^M^^m:'''^^mi^ '^^^mm^^^ e i^-:^':^:i^^^^mm 



SECTION AND ELEVATION 



Fig. 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 3{^, 7i, lOf, and 14^6 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 



