THE FARMER’S SHORT-BOX MEASURING FLUME. 3 . 
the weir box, a definite location for the gauges, and a uniform plan 
of conducting the tests. 
Table 1 gives the standard weir-box dimensions and positions of 
the gauges. The letters used refer to Figure 1. It will be noted that 
the location of the gauges is the same for all the sizes of flumes. The 
discharge over this type of weir is very nearly proportional to the 
width of the flume, and therefore the condition of the flow is very 
nearly independent of the width; consequently, the position of the 
gauges need not be changed for the various sizes of flumes. The 
gauge point, 1 foot upstream from the weir bulkhead, was so located 
as to be outside the influence of the contraction lines of the water 
entering the flume, and not too near the crest. Because of the dis- 
turbed condition of the water below the crest the gauge point, 2 feet 
downstream from the weir bulkhead, was placed as far below the 
crest as the dimensions of the smallest flume would permit. The 
elevation of the zero of the gauges is not given. It depends on the 
height of the weir crest, and for convenience should be at the eleva- 
tion of the crest. 
TABLE 1.—Standard dimensions for farmer’s short-box measuring flumes. 
| | A dod | Be aay tees Ged 7 | BRS ae ene Ae NUE 
| | | | Dis- | Dis- | 
hey : Length |Length | t#uce | tance | | Thick- 
Size | Capacity of | Grpox of box | fom | from Depth | ness |Length pets 
of weir per Gisscd | hhelow |: Mtoe weir | Depth | or | of of Length | Height 
poi.) second. weir | weir | oe eae | oe ‘cut-off | walls | wing aiken mee 
bulk- | bulk- | *| wall. | and | walls. ; = 
head. | head. | 1°... | to | | floor. 
Feet Cubic feet. Fee. | Feet. | Feet. | Feet. | Feet: | Feet. | Inches.| Feet. | Feet. | Feet. 
1 0.3 to 3.5 2 2 | 25 1 Dil aah ait 0.5 | 4 0.5 IESE ae) 
ES | 0.5 ta8_.-.:-2 7 hl EES es 1 2 (1) 0.5 | 4 0.5 P5 (2) 
- <i al Uo a 2 3 1 de (@) 0.5 | + 0.5 2% ee (2) 
~1 | tio... 2 3.5 1 wi eee os wee eee 6 1 3 (3) 
4 | 1.5 to 14. 2 4 1 2 1 6 1 4 (2) 
1 The distance E depends on the height of P and the capacity required. 
2 The height of the crest P depends on the fall available in the lateral. 
All the tests upon which the tables and charts are based were made 
at the hydraulic laboratory at Fort Collins, Colo.2 The general 
arrangement of the apparatus used in the calibration is shown in 
Figure 2. The flume itself is similar to that shown in Figure 1, ex- 
cept that auxiliary walls, with a side slope of 1 to 1, have been 
attached to the upper end of the structure in order to approach more 
nearly the condition in a lateral. The,points for taking the gauge 
readings are the same as in the standard measuring flume, but to 
increase the accuracy the gauge readings above and below the crest 
were taken by means of hook gauges located in the stilling wells 
4 For a complete description of the hydraulic laboratory, see Engineering News, vol. 70, No. 14, pp. 
662-665, Oct. 2, 1913, V. M. Cone. 
