Waste: Some adjustment to predicted yield may be required to account for logging waste if you want TIPSY’s merchantable volume predictions to indicate the volume that will be removed from the site. Use of the appropriate merchantability limits in TIPSY will help, but depending on the characteristics of the trees left as waste, some additional adjustment may be required. TIPSY’s merchantable volume/ha prediction includes the stem volume between stump height and minimum top diameter of all live trees above the minimum diameter.