34 



BULLETIN 495, U. S. DEPARTMENT OF AGRICULTURE. 



POWER. 



The kind and amount of power a farmer should use for spray 

 irrigation must depend "inch upon his local facilities for obtaining 

 fuel or electricity. The fuels most commonly used in the humid re- 

 gions are gasoline, kerosene, natural gas. and, in Florida, wood. In 

 the arid regions the heavier oils, as well as electricity, are more avail- 

 able and can be added to the other common sources of power. With 

 an engine a farmer is incurring no fuel charge except when it runs, 

 although where a plant is to be run more or less continuously during 

 an irrigation season, as in the arid districts, electricit} 7 is a much 

 more automatic, cleaner, and often cheaper power to use. Some 

 farmers may have a portable engine or tractor for other uses on the 

 farm which can be used economically if the pump is purchased to 

 suit such power. 



Table 6. — Horsepower required to lift different quantities of water to eleva- 

 tions of 10 feet to 800 feet. 



[Efficiency of pumping plant, 50 per cent of theoretical. Use for estimating purposes only.] 



Gallons per 

 minute. 



Elevation in feet. 



10 20 30 40 50 60 70 80 90 100 125 150 175 200 250 300 



5.. 

 in. 

 15. 



25. 



h.p 



0. 025 

 .050 

 .075 

 .100 

 .125 



30 



35 



.150 

 .175 



40 



.200 



45 



50 



60 



.225 

 .250 



300 



70 



.350 



80 



.400 



100 



.500 



125 



175 



.625 

 .875 



200 



1.00 



250 



1.25 



300 



1.50 



350 



400 



1 . 75 

 2.00 



500 



2.50 



600 



3.00 



700... 



3.50 



800 



900 . 



4.00 

 4.50 



1,000 



5.00 







h.p. 



0.05 

 .10 

 .15 

 .20 

 .25 



.30 

 .35 

 .40 

 .45 

 .50 



.60 

 .70 

 .80 

 .90 

 1.00 



1.25 

 1.50 

 1.75 

 2.00 

 2.50 



3.00 

 3.50 

 4.00 

 4.50 

 5.00 



li.p 



0.07 

 .15 

 .22 

 .30 

 .37 



li.p. 



0.10 

 .20 

 .30 

 .40 

 .50 



.45 .60 

 .52 .70 

 .60 



.90 

 1.00 



.90 

 1.05 

 1.20 

 1.35 

 1.50 



1 



2.25 



2.62 



3.00 



3.75 



1.20 

 1.40 

 1.60 

 1.80 

 2.00 



It. p. 



0.12 

 .25 

 .37 

 .50 

 .62 



.75 



.87 



1.00 



1.12 



1.25 



1.50 

 1.75 

 2.00 

 2.25 

 2.50 



h.p. 



0.14 

 .30 

 .45 

 .60 

 .75 



h.p. 



0.16 

 .35 

 .52 

 .70 



.90 1.04 

 1.05 ! 1.22 



1.20 

 1.35 

 1.50 



1.40 

 1.56 

 1.74 



h.p. 



0.20 

 .40 

 .60 

 .80 



1.00 



1.20 

 1.40 

 1.60 

 1.80 

 2.00 



1.80! 2.101 2.40 



2.10 2.44 



2.40 2.80 



2. 70 3. 14 



3.00 3.50 



2.50 3.12 



3.00 3.75 

 3.50 4.37 



4.001 5.00 

 5.00 6.25 



2. 80 

 3.20 

 3.60 

 4.00 



3.75 4.36 5.00 



4.50 5.24J 6.00 



5.25 6.12 7.00 



6.00 7.00i 8.00 



7.501 8.7510.00 



h.p. 



0.22 



.44 



1.12 



1.35 



1.58 

 1.80 

 2.02 

 2.24 



2.70 

 3.14 

 3.60 

 4.04 

 4.50 



5.62 

 6.75 

 7.8 

 9.00 

 11.25 



h.p. 



0.25 

 .50 

 .75 



1.00 



1.25 



1.50 

 1.75 

 2.00 

 2.25 

 2.50 



3.00 

 3.50 

 4.00 

 4.50 

 5.00 



6.25 

 7.50 

 8.75 

 10.00 

 12.50 



li.p. 



0.31 



.62 



.94 



1.25 



1.56 



1.87 

 2.19 

 2.50 

 2.81 

 3.12 



3.75 

 4.38 

 5.00 

 5.62 

 6.25 



7.81 



9.37 

 10.94 

 12. 50 



1.5.62 



h.p. 

 0.37 

 .75 

 1.12 

 1.50 

 1.87 



2.25 



2.62 



3.00 



3.3 



3.75 



4.50 

 5.25 

 6.00 

 6.75 

 7.50 



9.37 



11.25 

 13.12 



15.00 



is. 75 



h.p. 

 0.43 

 .87 

 1.31 

 1.75 

 2.18 



2.62 

 3. 15 

 3.50 

 3.94 

 4.37 



5.25 

 6.12 

 7.00 

 7.87 

 8.75 



10.94 

 13.12 

 15.31 

 17. 50 

 21.87 



h.p 

 0.50 

 1.00 

 1.50 

 2.00 

 2.50 



3.00 

 3.50 

 4.00 

 4.50 

 5.00 



6.00 

 7.00 

 8.00 

 9.00 

 10.00 



12. 50 

 15.00 

 17.50 



20.00 

 25.00 



h. p. 

 0.62 

 1.24 

 1.88 

 2.50 

 3.12 



3.74 



4.38 

 5.00 

 5.62 

 6.24 



7.50 

 8.76 

 10.00 

 11.24 

 12.50 



15.62 

 18.74 

 21.88 

 25. 00 

 31.24 



4.50 6.00' 7. .50 9.00 10. .50 12.00 13. 50 , 15. 00 18.75 22. 50 26.25 30.00 37.50 



5.25 7.00' 8. 75 10. 50 12. 25 14. 00 15. 75 17. 50 21. 87 26. 25i30.62 35.00. 43.74 



6. 10 8. 00 10. 00 12. 00 14. 00 16. 00 18. 00 20. O0J25. 00 30. 00 35. 00 40. 00. 50. 00 



6. 75| 9. 00 11. 25 13. 50 15. 75 18. 00 20. 25 22. 50 28. 13 33. 75 39. 37 45. 00 56. 26 



7. 50 10. 0012. 50 15. 00 17. 50 20. 00 22. 50 25. 00,31. 25 37. 50 43. 75 50. 00 62. 50 



6. 00 9. 00 12. 0015. 00 18. 00 21. 00 24. 00 



7. 00 10. 50 14.00 17. .".0 L'l . 00 24. 50 28. 00 



8. 00112. 00 16. 00 20. 00 24. 00 28. 00 32. 00 

 9. 00 13. 50 IS. 00 22. .50,27. 00 31. 50 36. 00 



10. 00|15. 00 20. 00 25. 00 30. 00 35. 00 40. 00 

 I I I I I I 



27.00 30.00 

 31.50 35.00 

 36. 0040. 00 

 40. 50 45. 00 

 45. 00,50.00 



37. 5045. 00 52. 50 

 43.7552.5061.25 



50. 00 

 56. 25 

 62. 50 



60.00,70.00 

 67.50 78.75 

 75. 00 87. 50 



60.00 

 70.00 

 80.00 

 00. 00 

 100.00 



75.00 

 87.50 

 100.00 

 112.50 

 125.00 



h.p. 

 0.75 

 1.50 

 2.25 

 3.00 

 3.75 



4.50 

 5.25 

 6.00 

 6.75 

 7.50 



9.00 

 10. 50 

 12.00 

 13. 50 

 15.00 



18.75 

 22.50 

 26.25 

 30.00 

 37.50 



45.00 

 52. 50 

 60.00 

 67. 50 

 75.00 



90.00 



105.00 

 120.00 

 135.00 

 150.00 



Table 6 gives the power necessary to lift different quantities of 

 water different heights. The table is based on an efficiency of 50 

 per cent of the theoretical horsepower, and will serve the farmer for 



