PORTLAND, Ore. -

The city of Portland is giving up an eight-year battle with federal regulators over covering drinking water reservoirs.

The city has resisted costly rules requiring reservoirs to be covered but the last request for a delay was denied.

A letter signed Monday by Mayor Charlie Hales and every city commissioner except Amanda Fritz says, "Faced with no other legal options and with deadlines looming, the city will move forward to meet the compliance timeline."

The plan calls for disconnecting a reservoir at Mt. Tabor and closing one of two reservoirs at Washington Park. The other will be covered with a reflection pool, so it will look the same. Two new covered reservoirs will be built at Kelly Butte and Powell Butte.