8 
DEPARTMENT BULLETIN 1110. 
TABLE 2.—Free-flow discharges in cubic feet per second, per foot in width of farmer’s 
short-box measuring flumes—Continued. 
2by 4 inch 2 by 6inch 2by &inch 2 by 12inch 2 by 16 inch 
weir, 0.307 feet | weir, 0.450 feet | weir, 0.594 feet weir, 0.907 feet weir, 1.203 feet 
high. high. high. high. high. 
Upper gauge 
head. — 
Feed | Spite. (Beadle) | Bead ih Tipige )yBiead Ct cysignd sees fina 
crest. charge eredt charge crest. charge. aeeat charge rs charge. 
| 
Feet. | Inches. | Inches. | Sec-ft. | Inches. | Sec.-ft.| Inches. | Sec.-ft. | Inches. | Sec.-ft. | Inches. | Sec.-ft. 
OJON 6 e 8B 1) Tel 2.25 Toe | 2.14 | 74 DM lig 735 2.09 | Ty 2.07 
Syl RA 7H 2, 29 Ta5 2.18 | TPs 2.16 T+? 2.13 | THs 2. 12 
~ t2| 8& | TR 2. 34 Ts 2.23 | Tre 2. 20 | 75 2.18 74 2.16 
73 83 74 2. 39 Tit. 2.98 | ree 2. 25 | 73 2. 22 | 73 2.21 
74 | Rf 8 2. 44 73 2.32 73 2. 30 74 2.21 | Ts 2. 26 
75 | 9 8t 2.49 7% 2.37 | 74 2.30 7-25 2.32 75 2. 30 
76 92 84 2.55 | 8 2. 42 7% 2.39 7# 2. 37 | 7 2535 
77 9} 82 2. 60 81 2.4 713 2. 44 | 7 2.41 | u 2.40 
78 93 84 2. 65 Bis | 2.52 | Sts 2. 49 | 7 2. 46 74 2.45 
79 94 Rs 2.70 8 Ps 2. 57 | 8335 Pei Mal 8 2501 7 2. 49 
| | | 
. 80 9g 844 2515 83 2. 62 8+ 2. 59 Roy 2.56. | 8 2. 54 
. 81 9} | 84S 2. 81 84 2. 67 82 2.64 | S35 2.61 | 84 2. 59 
- 82 O44 | 81% 2. 86 88 2.72 | Sy 2.69 84 2. 66 | 835 2. 64 
- 83 OH; | 9 2.91 83 2.77 | 835 201 83 2. ea 835 2. 69 
. 84 10, 9} 2. 96 83 2. 82 | 8H 2.79 | 85 2.76 Sos 2. 74 
.85| 10 | 94 3. 02 See | 2B 33 2. 84 | Sa 5.81 | 8h 2.79 
. 86 1055 | 93 3. 07 9¢5 2. 92 | 8} 2. 89 | 83 2. 86 83 2. 84 
e710. | POR 3.13 8; | 2: O77 Sit 2. 94 | 83 2.91 Sit 2. 89 
Lee | WOME! OMe? 8.18 94 3. 03 ee 2.99 | Shy 2.96 | ht 2. 94 
. 89 10# | 94 3. 24 93 3. 08 935 3. 05 S43 3. O1 | 8; 2.99 
-90| 10344! O42]. 3829 94 3.13 | 94 3.10 925 3. 06 9 3. 04 
-91 105 942 | 3.35 9-35 3. 19 | 98 3.15 94 3. 11 975 3. 09 
. 92 Hee!) AGG 3 at 94 3.24 | Oy 3. 20 | 94 331% 93, 3.15 
- 93 lls; | 104 3. 46 948 3. 29 9y%5 3. 26 | 95; 3. 22 gi 3. 20 
94) 113 104 3.52 O18 | 3.35) 944 3.31 | Oty 327 | 9 3.25 
-95 113 10% 3. 58 1045 3. 40 | 93 3. 36 | 94 3.32 | 94 3. 30 
. 96 114 | 10% 3. 63 105 3. 46 | 94 3. 42 98 3.38 9335 3. 36 
OY. THR | 10%; 3.69 104 3. 51 | 944 3.47 | 944 3. 43 944 3. 41 
. 98 112 10H; | 3.75 102 3.57 | 107; 3.03. | O43 3. 49 | 93 3. 46 
go Wg | Oe Bee. tea 3.62 bY 10-8, 3.58 | 944 3. 54 95 3. 52 
1.00 12 10H: | 3. 87 10-25 3. 68 104 3. 64 10 3. 60 943 | 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 23 
inches measured on the crest. In the column headed ‘‘Head on 
crest”’ for the 2 by 8 inch weir, find the 22-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 22-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. 
