Check valve installation could help prevent sewage floods in your basement An investigation is expected into the Great Lakes Water Authority's handling of the flooding around metro Detroit in June. and last updated 2021-07-19 20:27:44-04 DETROIT (WXYZ) â Detroit leaders say FEMA had crews in the city on Monday as it worked to set up an office to serve flood victims. The Detroit Water and Sewerage Department says in Detroit alone approximately 20,000 claims have been filed for damage from floods last month, and then we saw floods again Friday. There have also been floods in other communities from the Grosse Pointes to Dearborn and Garden City, to name a few.