MISC. PUBLICATION 22 5, U. 



DEPT. OF AGRICULTURE 



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



values 



Cubic feet 



Gallons per 



Cubic feet 

 per second 



Gallons per 



Acre-feet 



Acre- 

 feet 

 per day 



• 



Miner's 



Liters per 



Cubic 



meters per 



second 



per minute 



second 



(second- 

 feet) 



day 



per hour 



inch i 



second 



1 



0. 124675 



0. 016667 



10,771.95 



0. 001377 



0. 033058 

 (Ho) 



0. 66667 

 [H] 



0. 471938 









8. 02085 



1 



0. 133687 



86, 400 



0.011048 



0. 26515* 



5. 3472* 



3. 78533 



0. 003785 



(8) 





W) 





(Vw) 



04) 





(3 3 /4) 



(Hso) 



60 



7. 4805* 



1 



646, 316. 88 



0. 082645 



1. 98347 



40 



28. 3163 



0.028317 





(7tt) 







(MS) 



(2) 





(28) 



(Hs) 



726 



90. 5143 



12.1 



7, 820, 434. 29 



1 



24 



484 



342. 627 



0. 342636 





(90) 



(12) 









(500) 



(350) 



(H) 



30.25 



3. 77143 



0.504167 



325, 851. 43 



0. 041667 



1 



20. 1667 



14. 2767 



0.014276 



(30) 



mi) 



(H) 





\M4\ 





(20) 



(14) 



0/70) 



1.5 



0. 187013 



O/o) 



0.025 

 [Ho] 



16, 157. 9* 



0. 002066 



0. 049587 



1 



0. 707906 





[1H] 





2. 1189* 



0.264178 



0. 035315 



22, 824. 90 



0. 00291S 



0. 070047 





1 



2 o. oo; 



(2) 



04) 



(J*o) 















2, 118. 87 



264. 170 



35. 3145 





2. 91855 



70. 045* 





999. 973 



l 



(2000) 



(265) 



(35) 





(3) 



(70) 





(1000) 





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 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. m.) 



Product 



Shingles 



Lath 



Hoops 



Slack staves 



Tight staves 



Slack heading, sets 



Quantity 



10.000 

 5,000 

 3,000 

 3,000 

 1,000 

 500 



Product 



Tight heading, sets *^^, 



Fence posts 



Round timber (ratio, 6:1) cubic feet.. 

 Sawed material (ratio, 12:1) cubic feet 

 Poles (telephone) 



Quantity 



250 



200 



166. 667 

 83. 333 

 16. 667 



Table 16. — Approximate 1 equivalents of forest products 









Cubic 



Cubic feet 



Board feet 



Cords 



meters 









(steres) 



1 



26 





0.0283 



200 3 



1,000 



2 



7.25 



90* 



500 



1 



2.5 



35 



138 



0.25 



1 



1 Most of these volumetric units are not capable of 

 absolute conversion because of the character of the prod- 

 uct 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 approxima- 

 tions. 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 2.50 (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 contains 

 from 75 to 115 cubic feet of solid wood. 90 cubic feet is 

 taken as a rough conversion figure generally applicable. 



