The Tree Matrix algorithm uses five parameters that affect the long-term survivability of trees following construction. The formula produces a score as a percent likelihood of survival. The range is from 0-100%. Here are the likely results given a particular survival score:
0-59% Survival scores in this range suggest that the tree will not survive the typical 3-5-year recovery period after impact. In this range, it is best to remove the tree.
60-64% Survival scores within this range have a low to moderate chance of survival. Pre- and post-construction treatments are essential to best insure survival.
65-69% Survival scores within this range suggest that survival is possible with pre- and post-construction treatments. Supplemental irrigation and insect and disease control will be required.
70-80% Scores in this range suggest that survival is likely, but that pre- and post-construction treatments will be necessary. Supplemental irrigation and insect and disease control is highly recommended.
81-90%, Scores in this range are good, and suggest that survival is likely. Irrigation may be applied based on the amount of natural rainfall, and the general water needs of the specific tree impacted. A permanent irrigation system would not be required. Insect and disease monitoring and control are beneficial.
91-100%, Scores in this range are excellent. It suggests that the tree should not display any signs of stress, or a loss of vigor. A permanent irrigation system would not be required. Insect and disease monitoring and control are beneficial, but not necessary.