Section 24.39.80.302 - ILLUSTRATION OF UNDERCUTS01.Illustration of Undercuts. FIGURE 302.01.a. - CONVENTIONAL UNDERCUT
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a. Conventional Undercut. May be made with parallel saw cut and a diagonal cut. Backcut (D) shall be above undercut. FIGURE 302.01.b. - HUMBOLT UNDERCUT
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b. Humbolt Undercut. A cut in which both cuts made with the saw leaves a square end log (See Figure 302.01.b.). The cut is the same as a conventional cut (See Figure 302.01.a.) except that waste is on the stump. Backcut (D) shall be above undercut. FIGURE 302.01.c. - OPEN FACE UNDERCUT
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c. Open Face Undercut. A cut in which two (2) angle cuts are made with the saw (See Figure 302.01.c.) -- It is used when it is necessary that the face does not close until the tree is near the ground.Idaho Admin. Code r. 24.39.80.302