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