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