The flow modifier modifies the flow of water by creating {TAIL ~ a weir}, by diverting the flow of water, by reinforcing the channel bank, by creating a favorable habitat for plant life, or by {HEAD ~ some combination} of these effects 
The flow modifier modifies the flow of water by creating { TAIL ~ a weir } , by diverting the flow of water , by reinforcing the channel bank , by creating a favorable habitat for plant life , or by { HEAD ~ some combination } of these effects
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH