Stanislaus Hydropower Tunnel Fish Screen Project

Stanislaus Hydropower Tunnel Fish Screen Project

Background:

This 550 cfs (355.5 MGD, 56,067 m3/h) hydropower facility diverts was from the Stanislaus River to generate electricity. As a part of FERC relicensing, the facility was required to install 1.75-mm slot size wedge wire screens with an approach velocity of 0.4 fps (12.2 cm/s) to minimize potential entrainment of resident trout (Rainbow Trout and Brown Trout). The screens are contained in a gradually narrowing concrete channel to maintain sweeping velocities as water is diverted into the screens and then onto the hydropower turbines. A fish bypass is located at the downstream end of the concrete channel to provide for safe downstream passage.

Benefit of ISI System

ISI's retrievable brush-cleaned cylindrical screen system was selected as the project's preferred alternative as the cylindrical screen design provided the necessary screen surface area with a reduced facility footprint compared to other concepts and the retrievable screen design allows inspection and maintenance of individual screen units without shutting down hydropower operations.

Owner:

Pacific Gas & Electric Company (PG&E)

Engineer(s):

Black & Veatch

General Contractor:

Syblon Reid

Location:

Stanislaus River, Sand Bar Dam, CA