said water removal means comprises a water collection region extending along the bottom of said tank from one chamber to the other, water outlet means from the latter region, and said {HEAD ~ zones} opening downwardly to {TAIL ~ the latter region}, and 
opening downwardly to
said water removal means comprises a water collection region extending along the bottom of said tank from one chamber to the other , water outlet means from the latter region , and said { HEAD ~ zones } opening downwardly to { TAIL ~ the latter region } , and
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 OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH