That is, as effluent is admitted to the vessel {HEAD ~ the rate} at which liquid is withdrawn from the vessel is determined by {TAIL ~ the rate} at which a liquid constituent of the effluent enters the vessel so as to maintain the preselected level of liquid, or liquid bed 
is determined by
That is , as effluent is admitted to the vessel { HEAD ~ the rate } at which liquid is withdrawn from the vessel is determined by { TAIL ~ the rate } at which a liquid constituent of the effluent enters the vessel so as to maintain the preselected level of liquid , or liquid bed
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL REL 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 OTH OTH OTH OTH OTH OTH