It also accomplishes this result without {HEAD ~ the excessive expense} of {TAIL ~ water treatment} which has previously made such proposed use of superposed turbines impractical for continuous duty at such high pressures 
of
It also accomplishes this result without { HEAD ~ the excessive expense } of { TAIL ~ water treatment } which has previously made such proposed use of superposed turbines impractical for continuous duty at such high pressures
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH