( ( ( ( ( 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 ) ) ) ) ) . )
(ROOT (S (S (NP (EX There)) (VP (VBZ is) (NP (NP (DT a) (JJ high) (NN water) (NN table)) (VP (VBG preventing) (NP (NP (NP (DT the) (JJ deep) (NN penetration)) (PP (IN of) (NP (NN root) (NNS systems)))) (CC and) (NP (NP (JJ secure) (NN anchorage)) (PP (IN of) (NP (NNS trees))))))))) (, ,) (RB thus) (S (NP (JJ many) (NNS trees)) (VP (VB topple) (PP (IN alongside) (NP (DT the) (NN river))))) (. .)))
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.
(ROOT (S (NP (JJ Deep) (NNS roots)) (VP (MD will) (ADVP (RBS best)) (VP (VB prevent) (NP (DT a) (NN tree)) (PP (IN from) (S (VP (VBG being) (VP (VBN blown) (PRT (RP over)) (PP (IN by) (NP (JJ high) (NNS winds))) (PP (IN during) (NP (DT a) (NN storm))))))))) (. .)))
Deep roots will best prevent a tree from being blown over by high winds during a storm.