(S (S (BASENP (DT The) (NN flooding)) (VP (VBD was) (VP (VBN caused) (PP (IN by) (NP (NP (BASENP (DT a) (JJ heavy) (NN rainstorm)) (PP (IN on) (BASENP (NNP Saturday)))) (SBAR (WHNP (WDT which)) (S (VP (VBD caused) (S (NP (BASENP (DT a) (NN wall)) (PP (IN of) (BASENP (NN water)))) (VP (TO to) (VP (VB trigger) (PP (IN down) (BASENP (DT the) (NN gorge)))))))))))))) (PERIOD .))