Bureau of Reclamation Banner

Robles Proposed Streaming Flow Fishway

by Jim Higgs

and Brent Mefford

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 first streaming flow fishway is displayed with dynamically increasing inflow up to 210 CFS.



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.



Mailing Address
Jim Higgs
Bureau of Reclamation
Mail Code 86-68460
PO Box 25007
Denver, CO 80225-0007

Phone/Fax Numbers
Phone: 303-445-2147
Fax: 303-445-6324

Package Delivery Address

Bureau of Reclamation
Bldg. 67, Rm. 152, 86-68460
Denver Federal Center
6th Avenue and Kipling St.
Denver, CO 80225-0007


Sending and Receiving Large Electronic Files

We cannot receive files larger than 25 MB via e-mail. To send or receive large files, establish temporary access to our FTP site.

Many of the documents on our site are Adobe Acrobat (PDF) files.  You can obtain the Acrobat Reader from the Adobe web site.

Last reviewed: 11/2/2008