FARM POWER AND MACHINERY. 



239 



Flow in Ditches and Flumes 



Velocity in feet per second, and quantity in gallons per minute. For various sizes 

 and slopes. 



oi 



3/i Velocity 10. 46 10. 64 0.82 

 Inch G. P. M. 97! 322 735 



a 

 fe 









1>^ 



Inches 



i 3 

 I Inches 



I 4K 

 i Inches 



Velocity jO.65 

 G. P. M.l 142 



1.1 

 2250 

 0.91 1.2 1.6 

 457 i 105,03225 

 Velocity I0.93| 1.3' 1.6l 2.2 

 G. P. M.j 210 65011425 

 Velocity! 1.1 1.61 2.0 



1.4i 1.6, 1.9 2.1 2.3 

 5100 9000 15375:23000 33000 

 2.0 2.3; 2.7' 3.0i 3.3 

 7200 12900 2 1760:33060 147250 



P. M.| 247 



2 8 

 4400 10060 



2.7; 3.4 



3.3l 3.8: 4.21 4.7 

 18600 30750146125 J69000 

 4.0I 4.6 



810 1800 ! 5475 1122251 22500137125! 



' }i Velocity 



i Inch G. P. M.j 

 t ! 



i IK Velocity i 



! Inches G. P. M. 



i ' \ 



3 Velocity ; 

 Inches G. P. M.j 



i 4>^ Velocity j 

 Inches G. P. M.j 



6 1 Velocity j 

 Inches G. P. M.^ 



1.2 

 270 1 



1.6 1.9 



825 1725 



2.6i 

 52001 



3.7' 

 7500 



2.5 

 45370 



3.6 

 65250 



1.71 2.2 2.7 

 382 1130 2430 



2.4 3.1 3.9 5.2 

 54011560 3510 10500 



2. 31 3.8 4.8> 6.4 

 6S0{1920 4312 12900 



3.3| 4.4 5.5 7.3 

 74212220 4950 14775 



3.2^ 3.7: 4.2 4.6 5.0' 5.4 

 1147; 52085 03375 05025 07200 0975001 



4.5 5.2 5.9 6.5 7.1' 7.7 

 16200 29250 47625171520 10200 0140250 



6.4 7.4 

 22950J 41625 



7.8 

 28050 



O, 



Oi-l 

 o . 



ao 



CO 



o 



§ o 



% [Velocity 

 Inch jG. P. M. 



\}i j Velocity 

 Inches! G. P. M. 



3 I Velocity 

 Inches; G. P. M. 



4K iVelocity 

 Inches G. P. M. 



1.7 2.3; 2.7i 

 382 1162 24301 



2.4 

 540 



3.4 

 765 



4.1 



3.2 

 1620 



3.6' 4.4; 5.0 5.6^ 6.2i 6.8 7.3 

 7275 15750 28125 45000 68250 97500 13750 



3.9 5.1 

 3510 10275 



4.5> 5.51 7.2 

 2250 j4950 I 14550 



5.5 6.7.1 



915 12775 16O37 



I 6 Velocity ; 4.8: 6.4; 7.7 

 Inches G. P. M.il072 3225 6937 ^ 



6.2 

 22350 



7.1 8.0 

 39750 1645001 



Useful Information — Water 



Doubling the diameter of a pipe increases its capacity four times. Friction cf 

 liquids in pipes increases as the square of the velocity. 



The mean pressure of the atmosphere is usually estimated at 14.7 pounds per square 

 inch, so that with a perfect vacuum it will sustain a column^of mercury 29.9 inches or a 

 column of water 33.9 feet high at sea level. 



To find the pressure in pounds per square inch of a coliunn of water, multiply the 

 height of the column in feet by .434. Approximately, we say that every foot elevation 

 is equal to one -half pound pressure per square inch; this allows for ordinary friction. 



To find the velocity in feet per minute necessary to discharge a given volimie of 

 water in a given time, multiply the number of cubic feet of water by 144 and divide the 

 product by the area of the pipe in inches. 



To find the area of a required pipe, the volume and velocity of water being given, 

 multiply the number of cubic feet of water by 144 and divide the product by the velocity 

 in feet per minute. The area being found, it is easy to get the diameter of pipe necessary. 



