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Changing the drainage pattern
Trees
often decline when water is re-routed toward or away from the root system. This often results
from soil grade changes on a construction site. Roots grow accustomed to a pattern
of water movement through the soil. When more is added from surface flow from
surrounding areas, roots can suffer as soil oxygen levels go down. When less
or more water reaches the site than before roots are unable to grow as they did prior to the grade change. This can lead
to a decline in health and can kill trees.