Abstract
ABSTRACT Tests made to determine the scour downstream of the straight drop spillway stilling basin and the size and placement of riprap to ensure stability of the structure are described in this article. The problem and the need for making the tests are discussed. Results are presented on the performance of the spillway with square and rounded abutments at the entrance to the stilling basin and with basins shorter than those recommended by the original design criteria. Criteria are presented to select the size and placement of riprap downstream of straight drop spillway stilling basins to ensure the integrity of the structures.
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