Xl'RSERV PRACTICE FOR PRAJRIE-PLAIXS PLANTING 



69 



Table 17. — Discharge table for a 24-inch, rectangular, sharp-crested weir with end 



contractions ' 



Head 



Discharge 



Head 



Discharge 







Cubic feet 



Gallons 







Cubic feet 



Gallons 







per second 



per min- 







per second 



per min- 



Feet 



Inches 





ute 



Feet 



Inches 





ute 



0.01 



H 



0.006 



3 



0.51 



6^ 



2.33 



1,049 



.02 



H 



.018 



8 



.52 



6j4 



2.40 



1,080 



.03 



H 



.034 



15 



.53 



6% 



2.46 



1, 107 



.04 



M 



.052 



23 



.54 



&H 



2.53 



1,138 



.05 



H 



.072 



32 



.55 



65/6 



2.60 



1,170 



.06 



i/e 



.096 



43 



.56 



6% 



2.67 



1,202 



.07 



l3/i 6 



.122 



55 



.57 



613/i 6 



2.74 



1.233 



.08 



15 /16 



.146 



66 



.58 



6i5/ 6 



2.81 



1.265 



.09 



lMe 



.176 



79 



.59 



7/ 6 



2.88 



1,296 



.10 



me 



.206 



93 



.60 



73/ 6 



2.96 



1.332 



. 11 



me 



.236 



106 



.61 



7/1 6 



3.03 



1,364 



.12 



1^6 



.270 



122 



.62 



7/l6 



3.10 



1,395 



.13 



l%6 



.304 



137 



.63 



7?/l 6 



3.17 



1.427 



. 14 



l'Me 



.340 



153 



.64 



71/16 



3.25 



1,463 



. 15 



im* 



.378 



170 



.65 



713/6 



3.32 



1, 494 



.16 



ime 



.416 



187 



.66 



715/6 



3.40 



1. 530 



. 17 



2/ 6 



.456 



205 



.67 



8/16 



3.47 



1,562 



.18 



2%6 



.496 



223 



.68 



83/i 6 



3.56 



1,602 



.19 



25/16 



.540 



243 



.69 



8/4 



3.63 



1,634 



.20 



2% 



.588 



265 



.70 



8H 



3.71 



1,670 



.21 



2H 



.632 



284 



.71 



8^ 



3.78 



1. 701 



.22 



2% 



.677 



305 



.72 



Stt 



3.86 



1. 737 



.23 



2% 



.723 



325 



.73 



8% 



3.94 



1. 773 



.24 



2% 



.769 



346 



.74 



m 



4.02 



1,809 



.25 



3 



.817 



368 



.75 



9 



4.10 



1.845 



.26 



3^ 



.865 



389 



.76 



9H 



4.18 



1,881 



.27 



3H 



.914 



411 



.77 



91/ 



4.26 



1,917 



.28 



m 



.965 



434 



.78 



m 



4.34 



1. 953 



.29 



m 



1.02 



459 



.79 



m 



4.42 



1,989 



.30 



3H 



1.07 



482 



.80 



m 



4.51 



2,030 



.31 



3% 



1.12 



504 



.81 



9% 



4.59 



2, 066 



.32 



31^6 



1.18 



531 



.82 



913/6 



4.67 



2,102 



.33 



31^6 



1.23 



554 



.83 



915/16 



4.75 



2,138 



.34 



4Mb 



1.28 



576 



.84 



10/ 6 



4.84 



2,178 



.35 



m& 



1.34 



603 



.85 



103/6 



4.92 



2,214 



.36 



m 6 



1.40 



630 



.86 



105/e 



5.01 



2,254 



.37 



4^16 



1.45 



653 



.87 



10/1 6 



5.10 



2,295 



.38 



49/16 



1.51 



680 



.88 



109/16 



5.18 



2,331 



.39 



41/16 



1.57 



707 



.89 



lOH/6 



5.27 



2.372 



.40 



4i% 6 



1.63 



734 



.90 



1013/e 



5.35 



2. 408 



.41 



41M6 



1.69 



761 



.91 



1015/ 6 



5.44 



2,448 



.42 



5He 



1.75 



788 



.92 



11/16 



5.53 



2.489 



.43 



53/ 6 



1.81 



815 



.93 



113/6 



5.62 



2. 529 



.44 



514 



1.88 



846 



.94 



1114 



5.71 



2.570 



.45 



b% 



1.94 



873 



.95 



ll 3 ^ 



5.80 



2.610 



.46 



5H 



2.00 



900 



.96 



in. 



5.89 



2. »i51 



.47 



554 



2.07 



932 



.97 



11H 



5.98 



2. 691 



.48 



53/4 



2.13 



959 



.98 



ll 3 / 



6.07 



2. 732 



.49 



5% 



2.20 



990 



.99 



11% 



6. 15 



2. 768 



.50 



6 



2.26 



1,017 



1.00 



12 



6.25 



2,813 



Computed from the formula Q=3.247LH 



1.566Z 

 l+2£> 



gage) flowing over a 24-inch, rectangular, sharp-crested weir, expressed 

 in hundredths of a foot as well as in inches and fractions. Example: 

 Water-level reading on measuring gage is 3% inches, which according 

 to table 17, indicates that 389 gallons of water per minute is flowing 

 over the weir. If the water level were halfway between Z% inches and 

 3% inches on the gage, at 3 3 { 6 inches, half the difference between 411 

 and 389, or 11, would be added to 389, making the flow 400 gallons 

 per minute. 



PIPE AND DITCH DISCHARGE DATA 



Nurserymen are frequently confronted with the necessity for com- 

 puting sizes of pipe needed to deliver water in desired quantities and 

 without undue loss of pressure. As an aid in selecting correct pipe 

 sizes for various flows of water, it is necessary to consider such factors 

 as volume, loss of head, and distance the water must travel. 



