Earth Spillway Design Using SITES Software

by Darrel M. Temple,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


The USDA Natural Resources Conservation Service has, recently released new software for the design and analysis of water resource structure sites. This software, SITES, is based on the previous Soil Conservation Service DAMS2 structure site analysis software, but contains new technology for the analysis of vegetated and non-vegetated earth (soil and rock) spiliways. This new technology uses a three-phase approach to spiliway analysis. The phases are: 1) the failure of the vegetal spiliway lining, if present, 2) the surface erosion leading to the development of a vertical or near-vertical headcut, and 3) the deepening and upstream advance of the headcut with the potential of breaching the spiliway. Each of these phases has different physical characteristics and is represented by different mathematical relations in the computer model incorporated into the SITES software. The input parameters required by these relations and their impact on the predicted spiliway performance are discussed briefly.

Subject Headings: Computer software | Spillways | Site investigation | Hydraulic design | Water resources | Soil analysis | Drop structures | Dam failures

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