68 Cascade Ky

Nov. 1, 2021: COBU Newport Sewer Basin Capacity Improvements. The Newport Sewer Basin, located in the City of Bellevue, has experienced significant sewer pipeline surcharging that results from stormwater infiltration and inflow to the sewer system during high intensity and high-volume storm events. During large rain events, excess storm water can seep into the aging sewer system through small cracks. This rain infiltration can overwhelm the capacity of the system and lead to the risk of wastewater backups in low-lying homes. Bellevue crews currently manage this problem by using vacuum trucks to transport excess wastewater to the Newport Pump Station. Relying on this manual operation is not ideal.
The proposed project would improve both capacity and reliability of the current sewer system by constructing a new sewer "force" main, designed to move wastewater flows away from under-capacity areas.
The project consists of construction of an 8-inch diameter normally dry shallow force main between the reflector manhole (MH 188127) and MH 188073. During high flow rain events, a City -owned portable pump will draw surcharging sewer flows from a suction port at the reflector manhole and pump them into an adjacent force main port. The force main will discharge into MH 188073 where the diverted flows will be conveyed to Newport Pump Station via an existing gravity main in Newport Key.

Jan. 24, 2023: Completed.

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