DEPARTMENT BULLETIN 1110. 



Table 2. — Free-flow dischatges in cubic feet per second, per foot in width of farmer^ 

 short-box measuring flumes — Continued. 







2 by 4 inch 



2 bv 6 inch 



2 by 8 inch 



2 bv 12 inch 



2 by 16 inch 







weir, 0.307 feet 



weir, 0.450 feet 



weir, 0.594 feet 



weir, 0.907 feet 



weir, 1.203 feet 







Wgh. 



high. 



high. 



high. 



high. 



Uppe 



r gauge 

 jad. 





















h 



























Head 



Dis- 



Head 



Dis- 



Head 



Dis- 



Head 



Dis- 



Head 



Dis- 





- 



on 

 crest. 



charge. 



on 

 crest. 



charge. 



on 



crest. 



charge. 



on 

 crest. 



charge. 



on 



crest. 



charge. 



Feet. 



iTiches. 



Inches. 



Sec-ft. 



Inches. 



Sec-ft. 



Inches. 



Sec-ft. 



Inches. 



Sec-ft. 



Inches. 



Sec-ft. 



0.70 



8-1 



7A 



2.25 



7A 



2.14 



n 



2.11 



7-A 



2.09 



7^ 



2.07 



.71 



84 



7H 



2.29 



7A 



2.18 



7A 



2.16 



7t^ 



2.13 



7A 



2.12 



.72 



8g 



7« 



2.34 



7^ 



2.23 



7t^ 



2.20 



7A 



2.18 



7i 



2.16 



.73 



8i 



7J 



2.39 



7H 



2.28 



7A 



2.25 



7i 



2.22 



71- 



2.21 



.74 



81 



8 



2.44 



7a 



2.32 



n 



2.30 



7i 



2.27 



7A 



2.26 



.75 



9 



8i 



2.49 



7| 



2.37 



li 



2.35 



7A 



2.32 



7-ft 



2.30 



.76 



9i 



8i 



2.55 



8 



2.42 



n 



2.39 



7« 



2.37 



7i 



2.35 



.77 



9i 



81 



2.60 



8J 



2.47 



m 



2.44 



7H 



2.41 



7f 



2.40 



.78 



9S 



8i 



2.65 



8A 



2.52 



8-iV 



2.49 



7i 



2.46 



7-B 



2.45 



.79 



9i 



8A 



2.70 



8A 



2.57 



8A 



2.54 



8 



2.51 



7-ti 



2.49 



.80 



9S 



8H 



2.75 



8-1 



2.62 



8i 



2.59 



^ 



2.56 



8 



2.54 



.81 



9i 



8« 



2.81 



8i 



2.67 



8i 



2.64 



8A 



2.61 



8J 



2.59 



.82 





m 



2.86 



8f 



2.72 



^ 



2.09 



8i 



2.66 



8A 



2.64 



.83 



9'H' 



9 



2.91 



8f 



2.77 





2.74 



8f 



2.71 



8A 



2.69 



.84 



lOA 



9i 



2.96 





2.82 



8H 



2.79 



8A 



2.76 



8t^ 



2.74 



.85 



lOA 



9i 



3.02 



8H 



2.87 



81 



2.84 



8A 



2.81 



84 



2.79 



.86 



lOA 



9| 



3.07 



&iV 



2.92 



81 



2.89 



88 



2.86 





2.84 



.87 



IOtV 



' 9J 



3.13 



9A 



2.97 



m 



2.94 



8i 



2.91 



8-H 



2.89 



.88 



lOA 





3.18 





3.03 



^ 



2.99 



8« 



2.96 



8f| 



2.94 



.89 



lOH 



9tt 



3.24 



9| 



3.08 



9A 



3.05 



8il 



3.01 



8i 



2.99 



.90 



lOH 



9H 



3.29 



9i 



3.13 



9i 



3.10 



9t»j 



3.06 



9 



3.04 



.91 



lOH 



9-H 



3.35 



9-^ 



3.19 



91 



3.15 



9i 



3.11 



9A 



3.09 



.92 



llA 



10 



3.41 



9H 



3.24 



9A 



3.20 



9J 



3.17 



9A 



3.15 



.93 



llA 



m 



3.46 



9H 



3.29 



^■h 



3.26 



9A 



3.22 



9i 



3.20 



.94 



llj 



m 



3.52 



9tI 



3.35 



9H 



3.31 



9A 



3.27 



9i 



3.25 



.95 



Hi 



lOf 



3.58 



IOtV 



3.40 



9J 



3.36 



9i 



3.32 



9i 



3.30 



.96 



Hi 



lOi 



3.63 



101 



3.46 



91 



3.42 



9f 



3.38 



9t=. 



3. .36 



.97 



iif 



lOA 



3.69 



m 



3.51 



9« 



3.47 



9H 



3.43 



9H 



3.41 



.98 



• iif 



lOH 



3.75 



lOf 



3.57 



IOtV 



3.53 



9-ii 



3.49 



9} 



3.46 



.99 



Hi 



lOH 



3.81 



lOft- 



3.62 



lOA 



3.58 



9H 



3.54 



9i 



3.52 



1.00 



12 



lOH 



3.87 



lOA 



3.68 



lOi 



3.64 



10 



3.60 



91* 



3.57 



In order to illustrate the use of the table in finding the discharge, 

 assume a 1.5-foot flume with a 2 by 8 inch weir, and a head of 2f 

 inches measured on the crest. In the column headed "Head on 

 crest" for the 2 by 8 inch weir, find the 2|-inch head, and on the 

 same line, to the right in the column headed "Discharge," read 0.39 

 cubic feet per second. This is the discharge for a 1-foot flume. To 

 find the discharge for a 1.5-foot flume, multiply 0.39 by 1.5 and get 

 0.58 cubic feet per second, the discharge for a 1.5-foot flume under 

 conditions given above. Had the 2|-inch head been measured at 

 the upper gauge, then it would have been necessary to find the head 

 in the column headed "Head in inches" for the upper gauge and to 

 read the discharge of 0.31 cubic feet per second on the same line in 

 the discharge column for the 2 by 8 inch weir. The discharge for a 

 1.5-foot flume is then 1.5 times 0.31, or 0.46 cubic feet per second 

 when the head is measured at the upper gauge. The difference in 

 the two values obtained shows the necessity of using the proper 

 column in finding the head. 



