8 MISC. PUBLICATION 2 2 5, IT. S. DEPT. OF AGRICULTURE 



Table 14. — Discharge or flow of water; unit conversion factors, with approximate 



values. 



Cubic feet 

 per minute 



Gallons per 

 second 



Cubic 



feet per 

 second 

 (second- 

 feet) 



Gallons per 

 day 



Acre-feet 

 per hour 



Acre- 

 feet per 

 day 



Miner's 

 inch i 



Liters per 

 second 



Cubic 



meters per 



second 



1 



0. 124675 



(H) 



1 



7. 48052 

 (7H) 



90. 514.3 



(90) 



3. 7712 



(3) 



0. 187013 



(H) 



0. 264178 



(H) 



264. 170 



(265) 



0. 01667 



[Ho] 



0. 133681 



(H) 



12.1 



(12) 



0.5042 



0.025 



[Mo] 



0. 035315 



(Ho) 



35. 3145 



(35) 



10. 771. 92 

 86, 400. 



646, 316. 93 

 7, 820, 435. 52 



325, 828. 8 

 16, 157. 92 

 22, 824. 98 



0. 001377 



0.01105 



(Ho) 



2 0. 082645 



(Ha) 



0. 0417 



0. 002066 



0. 002919 



2. 91855 

 (3) 



0. 0330 



0. 2652 



1. 9835 



(2) 



24.0 



1 



0. 0496 

 0. 0701 

 0. 0452 



0.667 



0. 471938 



(H) 



3. 78533 



(334) 



28. 3163 



(28) 



342. 627 



(350) 



14. 2740 



(14) 



0. 707906 



1 



999. 973 

 (1000) 





8. 02083 



0. 003785 



(8) 

 60 



726 



30. 252 

 (30) 

 1.5 



40 



484 



(500) 



20. 168 



(20) 



(Hso) 



0. 028317 



(He) 



0. 342636 



(H) 



0.0145 



[1H] 



2. 11892 



3 0. 001 



(2) 

 2, 118. 87 





1 



(2000) 









1 Approximate values only; the miner's inch, used in many Western States to measure water flow, is the 

 quantity of water that will pass through an orifice 1 square inch in cross-section under a given head, and 

 varies from 1.36 to 1.73 cubic feet per minute. In California the legal standard is 1.5 cubic feet per minute, 

 or the flow through an aperture 2 inches high in a 1.25-inch plank under a 6-inch head above the center of 

 the stream. 



2 Or 1.98347 (approximately 2) acre-feet per day. 



3 See footnote 1, table 11. 



Table 15. — Approximate quantities of forest products represented by 1,000 feet of 

 timber board measure (1 M feet b. in.) 



Product 



Quantity 



Product 



Quantity 





10, 000 

 5,000 

 3,000 

 3,000 

 1,000 

 500 

 250 



Fence posts. 





Lath _-_ .. 



Round timber (ratio, 6:1) cubic feet 



Sawed material (ratio, 12:1) cubic feet._- 

 Poles (telephone) 



166 667 





83. 333 

 16 667 







Steres (m 3 ) 



7 25 





Cords. - .. ------- 



5 













Table 16. — Approximate x equivalents of forest products 



Cubic feet 



Board feet 



Cords 



Cubic 

 meters 



(steres) 



1 - - 



26 



1,000 

 500 

 138 



2 



1 

 0.25 



0. 0283 



200 3 - 



7.25 



90 < -. 



2.5 



35 



1 







1 Most of these volumetric units are not capable of absolute conversion because of the character of the 

 product and the manner of its utilization. 



2 The board foot per cubic foot ratio varies greatly, depending upon usage. Theoretically, 1 cubic foot 

 contains 12 board feet. For average values 6 should be used, though 10 is a convenient figure for approxi- 

 mations. When the conversion applies to trees, ratios of 3 to 8 should be applied. 



3 The number of cubic feet of wood per thousand board feet varies as between softwoods and hardwoods. 

 In softwoods, conversion factors vary from 160 to 220 cubic feet (working average about 183), and in hard- 

 woods, from 220 to 250 (working average 242) . 



4 Standard cord is 4 by 4 by 8 feet and contains 128 cubic feet gross volume (3.625m 3 ) . Because of methods 

 of piling, character of material, etc., a cord of wood contains from 75 to 115 cubic feet. 90 cubic feet is taken 

 as a rough conversion figure generally applicable. 



