How would a new tunnel and a new ocean outfall be sized?

A new tunnel/ocean outfall would be sized based on the findings of the Clearwater MFP.At a minimum, a new tunnel would need to be large enough to accommodate peak flows at the JWPCP through the year 2050 planning horizon. The Sanitation Districts prefer to convey as much flow by gravity as possible to increase reliability, conserve energy, and reduce operating costs.It is estimated that the tunnel will have an excavated diameter of approximately 20 to 22 feet and an internal finished diameter of approximately 18 feet. More.

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