Accession Number:

AD0621248

Title:

HYDRAULIC MODEL STUDIES OF THE CANAL TRANSITION AT THE FOREBAY PUMPING PLANT, SAN LUIS UNIT CENTRAL VALLEY PROJECT, CALIFORNIA,

Descriptive Note:

Corporate Author:

BUREAU OF RECLAMATION DENVER COLO HYDRAULICS BRANCH

Personal Author(s):

Report Date:

1965-06-15

Pagination or Media Count:

74.0

Abstract:

Hydraulic model studies of 2 intake channel transition designs for the Forebay Pumping Plant in San Luis Unit, CVP, showed that the hydraulic advantages of a symmetrical transition were not great enough to outweigh the economic advantages of an angled transition. Because the pumping plant location and alinement were fixed by geologic conditions a straight-in approach could not be used therefore 2 alternative schemes for the Forebay Canal alinement and transition configuration were studied by comparing velocity distributions, head losses, and surface flow patterns on a 115-scale model. Velocity distribution comparison indicated that a symmetrical transition with curved approach was preferable to an angled transition with straight canal alinement. Although the symmetrical transition showed slightly more desirable flow patterns, the strength of eddy currents occurring along the transition sides appeared to be the same for both types. Head loss difference between the 2 types was too small to justify comparison on this basis. The symmetrical transition exhibited less tendency to form vortices between the intake piers. Both types could possibly be improved by modifying the design--that is, widening the canal bottom or including vertical sidewalls at the pumping plant. The symmetrical transition, although hydraulically preferable, would require additional excavation and a longer approach canal, resulting in higher costs. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE