( ( Artificial discharge ) ( ( is ( induced ( by ( well ( digging ( or ( borehole drilling ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Artificial) (NN discharge)) (VP (VBZ is) (VP (VBN induced) (PP (IN by) (NP (RB well) (JJ digging) (CC or) (JJ borehole) (NN drilling))))) (. .)))
Artificial discharge is induced by well digging or borehole drilling.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-)) (ADVP (RB well)) (VP (VBZ is) (NP (NP (DT a) (NN hole)) (SBAR (WHNP (WDT that)) (S (VP (VBZ is) (VP (VBN dug) (CC or) (VBN drilled) (PP (IN through) (NP (NP (DT the) (NN ground)) (ADVP (RB down) (PP (TO to) (NP (DT an) (NN aquifer)))))))))))) (. .)))