Interlake Tunnel Project

California’s governor signed legislation on September 13 that allocates USD 10M of state money for the Interlake Tunnel project that would connect Lakes of Nacimiento and San Antonio.

The tunnel is about 3.7km and proposed as a flood control mechanism diverting water from Nacimiento Reservoir to San Antonio Reservoir that would have otherwise been spilled at Nacimiento Dam.

The Nacimiento River basin produces nearly three times the average annual flow of the San Antonio River basin, according to the Monterey County Water Resources Agency (MCWRA). Capturing high Nacimiento River flows and diverting those flows to San Antonio Reservoir increases the overall storage capacity of the system.

The tunnel will be designed to accommodate internal pressures and seismic activity in the region.

In addition to the conveyance tunnel between the lakes and intake and outlet facilities, the project concerns spillway modifications at Lake San Antonio to increase storage by approximately 60,000 acre-feet.

Depending upon the degree of environmental documentation, the Interlake Tunnel could be completed in two to three years.

Self drilling rock anchor’s effects in tunnel construction mainly reflect in preventing deformation, collapse and showing reinforcement and permanent support result.

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