Robles Proposed Streaming Flow Fishwayby Jim Higgs
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| This is an on going project. As such, information presented here is primarily for communications with clients, it is a work in progress, and it is not complete or peer reviewed. |
Two fishways that were proposed by Brent Mefford, also from the Hydraulic Investigations and Laboratory Services Group, to allow fish to swim upstream past Robles dam is being investigated. These two streaming flow fishway were simulated by Jim Higgs to determine submergence and to quantify flow-to-volume ratios.
The first simulation had 1.5-foot spacing between the cylinder baffles, with the center baffle 4-feet in height. The two adjacent cylinder baffles were 0.5 feet higher, and the rest of the cylinder baffles were 1 foot higher than that. Results below displays near surface velocities, which may be high. Residence time calculations indicated that there was a low volume to flow ratio, which may indicate impedance of upstream migration.
The second simulation shortened each cylinder baffle by 6 inches and reduced the spacing between cylinder baffles to 1-foot. Results shown below displays improved performance.
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Last reviewed: 11/2/2008