Learn to recognize where alluvial fans occur, and make every effort to protect the vegetation in the upland areas so that the plants roots can help to knit the soil together and protect against erosion and debris flows.
(roots; can help; to knit the soil together and protect against erosion and debris flows) Context(roots can help,List([133, 147))):(roots; can help to knit together; the soil) Context(roots can help,List([133, 147))):(roots; can help to protect; against erosion and debris flows)
roots can help,List([133, 147)) roots can help,List([133, 147))
roots roots roots
can help can help to knit together can help to protect
to knit the soil together and protect against erosion and debris flows
the soil
against erosion and debris flows