Foreword
Understanding the causative mechanisms of erosion on unlined spillways, and the ability to predict the occurrence and magnitude of scour, have been important subjects for the practicing community for many years. This Report represents an effort, commissioned by the Committee on Hydraulics of Dams of the United States Society on Dams (USSD), to compile information on the current state of knowledge on these important topics. This Report does not represent an exhaustive review of the subject, but rather is designed to provide practitioners with an understanding of the causative mechanisms of erosion on unlined spillways and a description of predictive models currently in use by the engineering community.
This Report is a combined effort of many contributors. Johannes L. Wibowo (Corps of Engineers) was the main editor whose tireless efforts have brought forth the final version of this Report after many years of coordination.
The Committee is grateful to George Annandale for his continued technical guidance and authorship of Chapter 3 and part of Chapter 1; Henry Falvey for Chapter 2 and part of Chapter 1; Tony L. Wahl (Bureau of Reclamation) for part of Chapter 2; Darrel Temple (Agricultural Research Service, USDA) for Chapter 4; Johannes L. Wibowo (Corps of Engineers) for part of Chapter 4 and Chapter 5; William Murphy (Corps of Engineers) for part of Chapter 4; James May (Corps of Engineers) for part of Chapter 5; and Erik Bollaert for Chapter 6.
Our thanks are also due to agencies such as the Corps of Engineers, Bureau of Reclamation, Tennessee Valley Authority, and the Agricultural Research Service, USDA for their valuable review and comments. Earl Eiker, Chair of the USSD Committee on Hydraulics of Dams, provided overall guidance of this publication through his committee. S. K. Nanda chaired the sub-committee that was responsible for this Report.
S.K. Nanda
Chairman, Erosion of Unlined Spillways Sub-Committee
USSD Committee on Hydraulics of Dams
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