Emergency Spillways: Difference between revisions
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“An emergency spillway is designed to provide additional protection against overtopping of a dam and/or dike and is intended for use under unusual or extreme conditions such as misoperation or malfunction of the service spillway or [[Outlet Works|outlet works]] during very large, remote floods (such as the PMF), or other emergency conditions. As with [[Auxiliary Spillways|auxiliary spillways]], some degree of [[structural]] damage and/or erosion may be expected due to releases up to and including the maximum design discharge”.<ref name="DS14">[[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations), USBR, | “An emergency spillway is designed to provide additional protection against overtopping of a dam and/or dike and is intended for use under unusual or extreme conditions such as misoperation or malfunction of the service spillway or [[Outlet Works|outlet works]] during very large, remote floods (such as the PMF), or other emergency conditions. As with [[Auxiliary Spillways | auxiliary spillways]], some degree of [[structural]] damage and/or erosion may be expected due to releases up to and including the maximum design discharge”.<ref name="DS14">[[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations), USBR, 2022]]</ref> | ||
In the past, auxiliary [[spillways]] were commonly referred to as emergency spillways. This practice should be discontinued. Media references to flow through “emergency spillways” often leads to a misconception by the public that an emergency condition exists at a dam when the dam is safely functioning as designed. <ref name="FEMA94">[[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94)| Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94), FEMA, 2013]]</ref> | In the past, auxiliary [[spillways]] were commonly referred to as emergency spillways. This practice should be discontinued. Media references to flow through “emergency spillways” often leads to a misconception by the public that an emergency condition exists at a dam when the dam is safely functioning as designed. <ref name="FEMA94">[[Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94) | Selecting and Accommodating Inflow Design Floods for Dams (FEMA P-94), FEMA, 2013]]</ref> | ||
==Best Practices Resources== | ==Best Practices Resources== | ||
{{Document Icon}} [[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations)|Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations) | {{Document Icon}} [[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations), USBR]] | ||
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Latest revision as of 19:37, 11 July 2023
“An emergency spillway is designed to provide additional protection against overtopping of a dam and/or dike and is intended for use under unusual or extreme conditions such as misoperation or malfunction of the service spillway or outlet works during very large, remote floods (such as the PMF), or other emergency conditions. As with auxiliary spillways, some degree of structural damage and/or erosion may be expected due to releases up to and including the maximum design discharge”.[1]
In the past, auxiliary spillways were commonly referred to as emergency spillways. This practice should be discontinued. Media references to flow through “emergency spillways” often leads to a misconception by the public that an emergency condition exists at a dam when the dam is safely functioning as designed. [2]
Best Practices Resources
Citations:
Revision ID: 7135
Revision Date: 07/11/2023