Model Study of Prado Food-Control Dam
Abstract
Tests were conducted on a 1:80-scale model of the Prado Dam and spillway to determine the adequacy of proposed modifications to the existing structure to convey the revised design flow of 615,000 cfs. These modifications were to serve as an interim solution until decisions were made either to make major design modifications to the existing structure or construct a new structure upstream of Prado Dam that would control downstream flow releases. Unsymmetrical approach conditions to the spillway resulted in poor flow conditions at the left and right abutments at the weir, which caused a reduction in the effective length of the weir. Test results indicated that installing long approach walls on either side improved flow conditions at the weir, but did not significantly increase the capacity of the spillway or improve flow conditions on the spillway. Therefore, dikes were installed on the left and right abutments to streamline approach conditions to the spillway, thereby improving flow conditions at the weir. With design conditions the water surface exceeded proposed wall heights along the spillway. Additional wall height was obtained by paving a small berm and existing topography along each side of the spillway. Flow conditions downstream of the flip bucket were unsatisfactory, with large standing waves present in the exit channel and a large eddy present between the spillway exit channel and the earth dam.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1989
- Accession Number
- ADA213101
Entities
People
- John F. George