( ( Makeup water ) ( ( is ( added ( until ( ( ( the mixture ) ( of ( residual ( water ( and ( makeup water ) ) ) ) ) ) ( overflows ( ( the reservoir ) ( for ( ( an ( adjustable period ) ) ( of time ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Makeup) (NN water)) (VP (VBZ is) (VP (VBN added) (SBAR (IN until) (S (NP (NP (DT the) (NN mixture)) (PP (IN of) (NP (JJ residual) (NN water) (CC and) (NN makeup) (NN water)))) (VP (VBZ overflows) (NP (NP (DT the) (NN reservoir)) (PP (IN for) (NP (NP (DT an) (JJ adjustable) (NN period)) (PP (IN of) (NP (NN time))))))))))) (. .)))
Makeup water is added until the mixture of residual water and makeup water overflows the reservoir for an adjustable period of time.
(ROOT (S (NP (DT A) (NN reservoir)) (VP (VBZ is) (NP (NP (NN part)) (PP (IN of) (NP (NP (DT a) (NN cycle)) (SBAR (WHNP (WDT that)) (S (VP (VBZ holds) (NP (NP (DT an) (NN element) (CC or) (NN water)) (PP (IN for) (NP (NP (DT a) (JJ long) (NN period)) (PP (IN of) (NP (NN time))))))))))))) (. .)))