3348 



Chapter 27 



Table 27-23 — Coefficients for estimating board-foot or cubic-foot volume in the princi- 

 pal hardwood species of the Southeast (Data from Bryan and McClure 1962) 



COEFFICIENTS FOR BOARD-FOOT VOLUME EQUATION' 



Species Number of trees used a bj 



Ashsp 45 - 2.44 0.038834 



Hickory sp 72 - 5.26 .038061 



Maple, red 67 - .42 .040385 



Oak, chestnut 109 - 8.61 .039357 



Oak, northern red 59 - 4.60 .040752 



Oak, scarlet 117 - 5.44 .039133 



Oak, white 77 -4.02 .039088 



Sweetgum 133 - 7.52 .040328 



Tupelo, black 98 - 12.86 .037147 



Yellow-poplar 83 - 14.93 .041232 



0.7236 

 .4626 



1 .0743 

 .4924 

 .8123 

 .6653 

 .6716 

 .7234 

 .3387 

 .5470 



COEFFICIENTS FOR CUBIC-FOOT VOLUME EQUATION^ 



Species Number of trees used b, b2 b3 



Ash, sp 56 0.005304 0.01861 0.00003298 



Hickory, sp 73 .005218 .02099 .00002196 



Maple, red 71 .005407 .02291 .00001495 



Oak, chestnut 112 .005127 .02191 .00002040 



Oak, northern red 60 .005331 .01970 .00002550 



Oak, scarlet 125 .005224 .01907 .00002712 



Oak, white 92 .005312 .01907 .00002843 



Sweetgum 139 .005285 .02244 .00002658 



Tupelo, black 141 .005056 .01617 .00006025 



Yellow-poplar 125 .005307 .01949 .00002839 



'Vb = a -h bjDSH + b2H 

 where: Vg = gross board-foot volume (International '/4-inch rule) 



D = diameter at breast height or 1 .5 feet above point of bottleneck for normally swell- 

 butted trees, inches. 

 S = scaling diameter (dib) at the top of the lower section, which is defined as the point 

 of noticeable change in stem taper (also top of saw log portion in sawtimber 

 trees), inches 

 H = length of lower section (also saw log section in sawtimber trees), feet. 

 2Vc = b,DSH + b2SU + bj (SU)^ 

 where: 



Wq = gross cubic-foot volume to a 4.0-inch top outside bark, excluding bark volume. 



U = upper section length in feet. This is the section from the top of the lower section to 



the 4.0-inch o.b. top, and D, S, and H are as defined in footnote 1. 



