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Can the existing tunnels be inspected and repaired without incurring the $1-2 billion cost of constructing a new tunnel and a new ocean outfall?

April 26, 2017constructing COST existing incurring inspected repaired tunnel tunnels

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Can the existing tunnels be inspected and repaired without incurring the $1-2 billion cost of constructing a new tunnel and a new ocean outfall?

2 Answers

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The Sanitation Districts are currently investigating the feasibility of inspecting the existing tunnels, but it is evident that such an operation, if possible, would present immense technical challenges and high risks. In order to thoroughly assess the condition of the existing tunnels, each tunnel would need to be inspected in a dry state, which would require constructing new facilities to hydraulically separate the tunnels to make them independent and temporarily diverting approximately two-thirds of the wastewater currently treated by the JWPCP.To put this into perspective, a diversion of at least 200 mgd would be required, which is the equivalent amount of wastewater generated by a city of 2 million people.At this time, the Sanitation Districts have not been able to identify a means of diverting this much flow to allow for an inspection.

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Posted

The Sanitation Districts are currently investigating the feasibility of inspecting the existing tunnels, but it is evident that such an operation, if possible, would present immense technical challenges and high risks. In order to thoroughly assess the condition of the existing tunnels, each tunnel would need to be inspected in a dry state, which would require constructing new facilities to hydraulically separate the tunnels to make them independent and temporarily diverting approximately two-thirds of the wastewater currently treated by the JWPCP. To put this into perspective, a diversion of at least 200 mgd would be required. At this time, the Sanitation Districts have not been able to identify a means of diverting this much flow to allow for an inspection.