Water released in {HEAD ~ the zones} gravitates downwardly into {TAIL ~ the water collection region} 96 and is removed 
Water released in { HEAD ~ the zones } gravitates downwardly into { TAIL ~ the water collection region } 96 and is removed
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH