{HEAD ~ An apparatus} and system for modifying {TAIL ~ the flow} of water in a channel are also disclosed 
{ HEAD ~ An apparatus } and system for modifying { TAIL ~ the flow } of water in a channel are also disclosed
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH