Spillway for Benbrook Dam, Clear Fork of the Trinity River, Texas: Model Investigation
Abstract
A model study of the spillway for Benbrook Dam, Clear ,Fork of the Trinity River, Texas, was conducted on a 1:60-scale model for the Galveston District Office, CE. The study was concerned primarily with the investigation of flow conditions resulting from the concentration of flow over the low weir section located in the center of the spillway and the determination of the adequacy of training walls to confine all flow to the exit channel. In the model tests flow in the approach channel and over the spillway of original design appeared satisfactory. However during the course of the tests, flow conditions at the abutments of both the high and low weir sections were improved slightly by rounding the abutments to the same curvature as the upstream portion of the high weir. Head-discharge relations as determined on the model were in close agreement 'with computations. Downstream from the spillway it was observed that the concentration of flow through the low weir during periods of high discharge created standing waves which diverged from the junction of flow over the two weir sections to a point about 575 ft downstream and impinged on the left side of the exit channel and right training wall causing considerable water to splash over the wall. No means of eliminating or reducing the height of these waves, that was considered economically justified, was found in the model tests. To protect the sides of the exit channel from the wave action, the tests indicated that the left training wall should be extended about 140 ft. The length of the right training wall appeared adequate. High velocities were measured in the exit channel for all conditions of discharge. For low discharges flows were confined to the center of the channel.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1949
- Accession Number
- ADA637738