premise: There is a high water table preventing the deep penetration of root systems and secure anchorage of trees, thus many trees topple alongside the river.
hypothesis: Deep roots will best prevent a tree from being blown over by high winds during a storm.
hypothesis_graph_structure: Deep roots<>will best prevent<>a tree<>from being blown over by high winds during a storm$$$a tree<>from being blown over<>by high winds<>during a storm