Overtopping Protection - Revision history

Grichards@gfnet.com at 22:32, 28 July 2023

2023-07-28T22:32:40Z

← Older revision		Revision as of 22:32, 28 July 2023
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	\|link=		\|link=
	<!-- Add picture caption -->		<!-- Add picture caption -->
	\|caption=Roller compacted concrete (RCC) overtopping protection of the earth embankment dam at Upper Deckers Site 1 in West Virginia.		\|caption=Roller compacted concrete (RCC) overtopping protection of the earth embankment dam at Upper Deckers Site 1 in West Virginia. (Photo Source: Gannett Fleming)
	}}		}}

Mpollei@gfnet.com at 19:41, 11 July 2023

2023-07-11T19:41:29Z

← Older revision		Revision as of 19:41, 11 July 2023
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	<noautolinks>==Best Practices Resources==</noautolinks>		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}} [[Technical Manual: Overtopping Protection for Dams (FEMA P-1015) \| Technical Manual: Overtopping Protection for Dams (FEMA P-1015), FEMA~~, 2014~~]]		{{Document Icon}} [[Technical Manual: Overtopping Protection for Dams (FEMA P-1015) \| Technical Manual: Overtopping Protection for Dams (FEMA P-1015), FEMA]]

	==Trainings==		==Trainings==

Rmanwaring: /* Best Practices Resources */

2022-12-14T00:12:33Z

Best Practices Resources

← Older revision		Revision as of 00:12, 14 December 2022
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	* [[Riprap]]		* [[Riprap]]

	==Best Practices Resources==		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}} [[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)\| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) ~~(Federal Emergency Management Agency)~~]]		{{Document Icon}} [[Technical Manual: Overtopping Protection for Dams (FEMA P-1015) \| Technical Manual: Overtopping Protection for Dams (FEMA P-1015), FEMA, 2014]]

	==Trainings==		==Trainings==
	{{Video Icon}} [[On-Demand Webinar: Dam Overtopping Protection Systems Part I]]		{{Video Icon}} [[On-Demand Webinar: Dam Overtopping Protection Systems Part I]]

Grichards at 20:23, 2 December 2022

2022-12-02T20:23:52Z

← Older revision		Revision as of 20:23, 2 December 2022
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	==Types of Overtopping Protection==		==Types of Overtopping Protection==
	* [[Roller Compacted Concrete]]		* [[Roller Compacted Concrete]]
	* [[~~Articulated~~ Concrete Blocks]]		* [[Precast Concrete Blocks]]
	* [[Concrete Slab]]		* [[Concrete Slab]]
	* [[Gabions]]		* [[Gabions]]

Grichards at 20:18, 2 December 2022

2022-12-02T20:18:03Z

← Older revision		Revision as of 20:18, 2 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
	"The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new information, the refinement of certain design requirements or guidelines, the adoption of risk-based criteria, or as part of a regular dam safety program. During this process, the design flood may be revised, resulting in a flood that is larger than was used for the original design. In many cases, analysis may show that the revised flood will result in the dam being overtopped due to insufficient reservoir storage and/or release capabilities." <ref name="FEMA1015">[[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)\| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency ~~Managemeng~~ Agency, 2014)]]</ref>		"The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new information, the refinement of certain design requirements or guidelines, the adoption of risk-based criteria, or as part of a regular dam safety program. During this process, the design flood may be revised, resulting in a flood that is larger than was used for the original design. In many cases, analysis may show that the revised flood will result in the dam being overtopped due to insufficient reservoir storage and/or release capabilities." <ref name="FEMA1015">[[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)\| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency Management Agency, 2014)]]</ref>

	"There are many methods available for accommodating larger revised floods. However, some of the more common methods, such as increasing reservoir storage by raising the dam crest or increasing release capability by increasing the spillway discharge capacity, can often be cost prohibitive or impractical. To address this situation, new design approaches have been developed that may allow for the dam to be safely overtopped. The design and [[construction]] of overtopping protection for dams is increasingly being viewed as a viable alternative to larger [[spillways]] as developing watersheds or changing [[hydrology]] produce higher peak flows and the need for additional spillway discharge capacity for existing dams." <ref name="FEMA1015" />		"There are many methods available for accommodating larger revised floods. However, some of the more common methods, such as increasing reservoir storage by raising the dam crest or increasing release capability by increasing the spillway discharge capacity, can often be cost prohibitive or impractical. To address this situation, new design approaches have been developed that may allow for the dam to be safely overtopped. The design and [[construction]] of overtopping protection for dams is increasingly being viewed as a viable alternative to larger [[spillways]] as developing watersheds or changing [[hydrology]] produce higher peak flows and the need for additional spillway discharge capacity for existing dams." <ref name="FEMA1015" />
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	"Overtopping protection may be an attractive alternative because of its potential economic advantages and may offer an economical solution to a hydrologic deficiency that would otherwise not be addressed. Maintaining the existing hydraulic conditions at the dam to the extent possible is also increasingly important as downstream river corridors are developed in close proximity to the channel." <ref name="FEMA1015" />		"Overtopping protection may be an attractive alternative because of its potential economic advantages and may offer an economical solution to a hydrologic deficiency that would otherwise not be addressed. Maintaining the existing hydraulic conditions at the dam to the extent possible is also increasingly important as downstream river corridors are developed in close proximity to the channel." <ref name="FEMA1015" />

	"The decision to pursue overtopping protection for an existing dam must give strong consideration to the potential risk of failure of the protection system, which could quickly lead to a full breach of the dam. This is especially true for embankment dams, in the sense that a small defect or design flaw could lead to catastrophic failure once the embankment is exposed to the overtopping flow. An evaluation of this type of risk must be incorporated into the decision-making		"The decision to pursue overtopping protection for an existing dam must give strong consideration to the potential risk of failure of the protection system, which could quickly lead to a full breach of the dam. This is especially true for [[Embankment Dams\|embankment dams]], in the sense that a small defect or design flaw could lead to catastrophic failure once the embankment is exposed to the overtopping flow. An evaluation of this type of risk must be incorporated into the decision-making
	process, whether qualitatively or quantitatively. A decision to use overtopping protection in place of improving the service spillway, imposing a reservoir restriction, raising the dam crest, or constructing an auxiliary spillway cannot be made lightly. Overtopping protection should generally be reserved for situations with some combination of very low annual probability of occurrence (e.g., 1 in 100), physical or [[environmental]] constraints on constructing other methods of flood conveyance, and prohibitive cost of other alternatives; or where downstream consequences of dam failure are demonstrated to be low." <ref name="FEMA1015" />		process, whether qualitatively or quantitatively. A decision to use overtopping protection in place of improving the service spillway, imposing a reservoir restriction, raising the dam crest, or constructing an auxiliary spillway cannot be made lightly. Overtopping protection should generally be reserved for situations with some combination of very low annual probability of occurrence (e.g., 1 in 100), physical or [[environmental]] constraints on constructing other methods of flood conveyance, and prohibitive cost of other alternatives; or where downstream consequences of dam failure are demonstrated to be low." <ref name="FEMA1015" />

Grichards at 02:51, 18 November 2022

2022-11-18T02:51:05Z

← Older revision		Revision as of 02:51, 18 November 2022
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	<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->		<!-- Delete any sections that are not necessary to your topic. Add pictures/sections as needed -->
	__NOTOC__		__NOTOC__
			[[Category:Water Conveyance]]
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	"The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new information, the refinement of certain design requirements or guidelines, the adoption of risk-based criteria, or as part of a regular dam safety program. During this process, the design flood may be revised, resulting in a flood that is larger than was used for the original design. In many cases, analysis may show that the revised flood will result in the dam being overtopped due to insufficient reservoir storage and/or release capabilities." <ref name="FEMA1015">[[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)\| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency Managemeng Agency, 2014)]]</ref>		"The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new information, the refinement of certain design requirements or guidelines, the adoption of risk-based criteria, or as part of a regular dam safety program. During this process, the design flood may be revised, resulting in a flood that is larger than was used for the original design. In many cases, analysis may show that the revised flood will result in the dam being overtopped due to insufficient reservoir storage and/or release capabilities." <ref name="FEMA1015">[[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)\| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency Managemeng Agency, 2014)]]</ref>

	"There are many methods available for accommodating larger revised floods. However, some of the more common methods, such as increasing reservoir storage by raising the dam crest or increasing release capability by increasing the spillway discharge capacity, can often be cost prohibitive or impractical. To address this situation, new design approaches have been developed that may allow for the dam to be safely overtopped. The design and construction of overtopping protection for dams is increasingly being viewed as a viable alternative to larger spillways as developing watersheds or changing hydrology produce higher peak flows and the need for additional spillway discharge capacity for existing dams." <ref name="FEMA1015" />		"There are many methods available for accommodating larger revised floods. However, some of the more common methods, such as increasing reservoir storage by raising the dam crest or increasing release capability by increasing the spillway discharge capacity, can often be cost prohibitive or impractical. To address this situation, new design approaches have been developed that may allow for the dam to be safely overtopped. The design and [[construction]] of overtopping protection for dams is increasingly being viewed as a viable alternative to larger [[spillways]] as developing watersheds or changing [[hydrology]] produce higher peak flows and the need for additional spillway discharge capacity for existing dams." <ref name="FEMA1015" />

	"Overtopping protection may be an attractive alternative because of its potential economic advantages and may offer an economical solution to a hydrologic deficiency that would otherwise not be addressed. Maintaining the existing hydraulic conditions at the dam to the extent possible is also increasingly important as downstream river corridors are developed in close proximity to the channel." <ref name="FEMA1015" />		"Overtopping protection may be an attractive alternative because of its potential economic advantages and may offer an economical solution to a hydrologic deficiency that would otherwise not be addressed. Maintaining the existing hydraulic conditions at the dam to the extent possible is also increasingly important as downstream river corridors are developed in close proximity to the channel." <ref name="FEMA1015" />

	"The decision to pursue overtopping protection for an existing dam must give strong consideration to the potential risk of failure of the protection system, which could quickly lead to a full breach of the dam. This is especially true for embankment dams, in the sense that a small defect or design flaw could lead to catastrophic failure once the embankment is exposed to the overtopping flow. An evaluation of this type of risk must be incorporated into the decision-making		"The decision to pursue overtopping protection for an existing dam must give strong consideration to the potential risk of failure of the protection system, which could quickly lead to a full breach of the dam. This is especially true for embankment dams, in the sense that a small defect or design flaw could lead to catastrophic failure once the embankment is exposed to the overtopping flow. An evaluation of this type of risk must be incorporated into the decision-making
	process, whether qualitatively or quantitatively. A decision to use overtopping protection in place of improving the service spillway, imposing a reservoir restriction, raising the dam crest, or constructing an auxiliary spillway cannot be made lightly. Overtopping protection should generally be reserved for situations with some combination of very low annual probability of occurrence (e.g., 1 in 100), physical or environmental constraints on constructing other methods of flood conveyance, and prohibitive cost of other alternatives; or where downstream consequences of dam failure are demonstrated to be low." <ref name="FEMA1015" />		process, whether qualitatively or quantitatively. A decision to use overtopping protection in place of improving the service spillway, imposing a reservoir restriction, raising the dam crest, or constructing an auxiliary spillway cannot be made lightly. Overtopping protection should generally be reserved for situations with some combination of very low annual probability of occurrence (e.g., 1 in 100), physical or [[environmental]] constraints on constructing other methods of flood conveyance, and prohibitive cost of other alternatives; or where downstream consequences of dam failure are demonstrated to be low." <ref name="FEMA1015" />

	==Types of Overtopping Protection==		==Types of Overtopping Protection==

Grichards at 05:38, 16 September 2022

2022-09-16T05:38:52Z

← Older revision		Revision as of 05:38, 16 September 2022
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	* [[Roller Compacted Concrete]]		* [[Roller Compacted Concrete]]
	* [[Articulated Concrete Blocks]]		* [[Articulated Concrete Blocks]]
	* [[Concrete]]		* [[Concrete Slab]]
	* [[Gabions]]		* [[Gabions]]
	* [[Vegetative Cover]]		* [[Vegetative Cover]]

Grichards at 05:36, 16 September 2022

2022-09-16T05:36:52Z

← Older revision		Revision as of 05:36, 16 September 2022
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	\|caption=		\|caption=Roller compacted concrete (RCC) overtopping protection of the earth embankment dam at Upper Deckers Site 1 in West Virginia.
	}}		}}

Grichards: Created page with " NOTOC ---- {{Picture |image= |link= |caption= }} "The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new informati..."

2022-09-16T05:34:41Z

Created page with " __NOTOC__ ---- {{Picture  |image=  |link=  |caption= }}  "The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new informati..."

New page

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"The original design of a dam may be reevaluated for a number of reasons, including the occurrence of an incident or unusual load, the availability of new information, the refinement of certain design requirements or guidelines, the adoption of risk-based criteria, or as part of a regular dam safety program. During this process, the design flood may be revised, resulting in a flood that is larger than was used for the original design. In many cases, analysis may show that the revised flood will result in the dam being overtopped due to insufficient reservoir storage and/or release capabilities." <ref name="FEMA1015">[[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency Managemeng Agency, 2014)]]</ref>

"There are many methods available for accommodating larger revised floods. However, some of the more common methods, such as increasing reservoir storage by raising the dam crest or increasing release capability by increasing the spillway discharge capacity, can often be cost prohibitive or impractical. To address this situation, new design approaches have been developed that may allow for the dam to be safely overtopped. The design and construction of overtopping protection for dams is increasingly being viewed as a viable alternative to larger spillways as developing watersheds or changing hydrology produce higher peak flows and the need for additional spillway discharge capacity for existing dams." <ref name="FEMA1015" />

"Overtopping protection may be an attractive alternative because of its potential economic advantages and may offer an economical solution to a hydrologic deficiency that would otherwise not be addressed. Maintaining the existing hydraulic conditions at the dam to the extent possible is also increasingly important as downstream river corridors are developed in close proximity to the channel." <ref name="FEMA1015" />

"The decision to pursue overtopping protection for an existing dam must give strong consideration to the potential risk of failure of the protection system, which could quickly lead to a full breach of the dam. This is especially true for embankment dams, in the sense that a small defect or design flaw could lead to catastrophic failure once the embankment is exposed to the overtopping flow. An evaluation of this type of risk must be incorporated into the decision-making
process, whether qualitatively or quantitatively. A decision to use overtopping protection in place of improving the service spillway, imposing a reservoir restriction, raising the dam crest, or constructing an auxiliary spillway cannot be made lightly. Overtopping protection should generally be reserved for situations with some combination of very low annual probability of occurrence (e.g., 1 in 100), physical or environmental constraints on constructing other methods of flood conveyance, and prohibitive cost of other alternatives; or where downstream consequences of dam failure are demonstrated to be low." <ref name="FEMA1015" />

==Types of Overtopping Protection==
* [[Roller Compacted Concrete]]
* [[Articulated Concrete Blocks]]
* [[Concrete]]
* [[Gabions]]
* [[Vegetative Cover]]
* [[Turf Reinforcement Mats]]
* [[Synthetic Turf Revetments]]
* [[Riprap]]

==Best Practices Resources==
{{Document Icon}} [[Technical Manual: Overtopping Protection for Dams (FEMA P-1015)| Technical Manual: Overtopping Protection for Dams (FEMA P-1015) (Federal Emergency Management Agency)]]
==Trainings==
{{Video Icon}} [[On-Demand Webinar: Dam Overtopping Protection Systems Part I]]
{{Video Icon}} [[On-Demand Webinar: Dam Overtopping Protection Systems Part 2]]


{{Citations}}


{{revhistinf}}