Sidechannel Spillway and Outlet Works for San Antonio Dam; Hydraulic Model Investigation.
Abstract
Model studies of the proposed uncontrolled side-channel spillway and outlet works for San Antonio Dam were conducted to develop, by means of 1:36- and 1:48-scale models of the spillway and a 1:20-scale model of the outlet works, satisfactory and economical designs for these elements. Particular attention was given to flow characteristics in the side channel, spillway chute, and flip bucket for the side-channel spillway and to performance of the intake structure, outlet conduit, and diversion structure for the outlet works. Although the spillway crest functioned satisfactorily as originally designed, excessive ride-up and turbulence in the side channel during the maximum design flow of 54,000 cfs indicated the need for improved performance of the channel. The addition of baffle blocks on the side-channel invert provided adequate control of the flow and reduced the excessive ride-up occurring in the channel. The flow in the spillway chute was more stable and less turbulent. A flip bucket with a radius of 75 ft and a terminal slope of 20 degrees above the horizontal is provided at the end of the chute. The bucket proved to be satisfactory and produced a favorable hydraulic action. At a spillway flow of 54,000 cfs, the bucket diffused the spillway jet quite well over the surface of the water and resulted in a lesser degree of erosion well removed from the end of the structure. Design wall heights were determined from water-surface profiles measured in the model.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1978
- Accession Number
- ADA062846
Entities
People
- Dave A. Barela
Organizations
- Los Angeles District, U.S. Army Corps of Engineers