The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________? August 15, 2021January 22, 2019 by admin The width of a settling tank with 2 hour detention period for treating sewage 378 cu m per hour, is __________________? A. 5 m B. 5.5 m C. 6.5 mD. 7 m