Author(s): S. Samuel Lin; Joseph S. Haugh; L. Lynn Clements
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Abstract: A valuable lesson is learned from a dam's severely eroded earth spillway due to a rare flood occurring in Virginia in 1995. Erosion is an inevitable consequence of an earth spillway because of soil's limited resistance to the attack imposed by a significant flood. However, the spillway structural stability must be maintained at its spillway design flood (SDF). RCC (roller compacted concrete) is recommended to rehabilitate the damaged emergency spillway instead of earthen channel spillway due to its unreliable stability and durability, particularly considering that the spillway is constructed on a very steep slope. This scheme has been chosen for the least cost of rehabilitation on the basis of risked-based economic analysis resulting from the comparison of alternatives and based on the remainder of the dam's service life.
Year: 1997