Several approaches are described for determining the width of areas to leave tree buffers along unstable slopes. These include measuring the crown width of trees to maintain canopy closure over slope breaks, projecting the angle of repose of stable ground back from unstable areas to establish buffer widths, and limiting corridor widths to less than 12 feet to minimize open canopy exposure to precipitation.

1. Mitigation Options:
Several approaches to determining width of a leave tree areas
Measure setback distance from lip (slope break) by looking at crown width to provide
protection of the lip & immediate upslope area by maintaining canopy closure to avoid
the lip area from being exposed directly to precipitation.
To establish what distance to move back from the slope break of an unstable area, find
the apparent angle of repose of stable ground of similar character and project that slope
angle back from the toe of the unstable slope or the head of a slide area.
Limit the width of the corridors to <12 so that minimal area within yarding corridors is
exposed to directly to precipitation by an open canopy.
Why 12 feet?? Must have been told this by a forester. Width must have to do with log
length??
Angle of repose of
stable ground
Project that angle in
order to establish the
width of the leave
area over the slope
break