COMMODITY DRAIN 



Commodity drain for both sampled and complete survey areas is 

 based chiefly on the reports of producing or consuming industries, 

 with adjustments for waste as determined from woods and mill-scale 

 studies Approximately 88 percent of the board-foot drain esti- 

 mates were derived from a complete canvass of sawmills, pulpmills, 

 pole manufacturers, railroads, and mines , The remaining portion, 

 consisting chiefly of drain for posts and fuelwood, was derived 

 in part from production and sales reports, and in part from con- 

 sumption ratios and urban and rural population statistics „ 



MORTALITY 



Mortality in growing stands of the area covered by complete sur- 

 vey was based on a tally of trees judged to have died within the 

 10-year period of the growth study Mortality of nongrowing 

 stands was derived by applying the mortality percent of growing 

 stands to the volume of nongrowing stands 



Mortality for the sample survey was based on a tally of trees 

 judged to have died during the last half of the growth-study 

 period (5 years) on each 1/5-acre plot sampled for inventory. 

 The five-year mortality was doubled to obtain mortality for the 

 entire growth=study period. 



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