WEST BLOOMFIELD, Mich. — Residents and businesses in Central Michigan communities that were submerged when two dams failed this week are suing the dam operator and two state agencies charged with overseeing the structures. The lawsuit came Friday as yet more residents were forced to evacuate their homes after being overwhelmed by flooding along the Tittabawassee River and conjoining waterways. The federal lawsuit alleges the dams’ operator, Boyce Hydro, “failed to operate, fix, or repair the dams ... resulting in catastrophic injury and damage.” The lawsuit also names the state Department of Environment, Great Lakes and Energy and the Michigan Department of Natural Resources.