Spillway Terminal Structure Hydraulics - Revision history

Mpollei@gfnet.com at 22:16, 27 July 2023

2023-07-27T22:16:28Z

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	\|caption= Spillway with energy dissipation system.		\|caption= Spillway with energy dissipation system.
	(Image Source: [https://~~creativecommons~~.org/~~licenses~~/by-~~sa/4.0/deed~~.en Creative Commons])		(Image Source: [https://commons.wikimedia.org/wiki/File:Bassin-de-dissipation_Soulages.jpg?uselang=fr Luppanox, Creative Commons])
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Mpollei@gfnet.com at 16:05, 25 July 2023

2023-07-25T16:05:50Z

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 [[Category:Hydraulic Performance of Spillways]]
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 “The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) | Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]</ref>

Mpollei@gfnet.com at 19:02, 11 July 2023

2023-07-11T19:02:18Z

← Older revision		Revision as of 19:02, 11 July 2023
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	==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), USBR~~, 2022~~]]		{{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]]
	{{Document Icon}} [[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE~~, 1992~~]]		{{Document Icon}} [[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE]]
	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR~~, 1987~~]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR]]

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Rmanwaring at 20:53, 19 December 2022

2022-12-19T20:53:36Z

← Older revision		Revision as of 20:53, 19 December 2022
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	“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]</ref>		“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]</ref>

	“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel scour and potential undermining of the stilling basin.” <ref name="EM110-2-1603"~~>[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]<~~/~~ref~~>		“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel scour and potential undermining of the stilling basin.” <ref name="EM110-2-1603"/>

	Learn more about this topic here: [[Energy Dissipation]]		Learn more about this topic here: [[Energy Dissipation]]

Rmanwaring at 20:53, 19 December 2022

2022-12-19T20:53:14Z

← Older revision		Revision as of 20:53, 19 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
	“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 ~~Hydraulic Design of Spillways~~, USACE, 1992]]</ref>		“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]</ref>

	“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel scour and potential undermining of the stilling basin.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel scour and potential undermining of the stilling basin.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

Rmanwaring at 20:52, 19 December 2022

2022-12-19T20:52:49Z

← Older revision		Revision as of 20:52, 19 December 2022
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	==Best Practices Resources==		==Best Practices Resources==
	~~{{Document Icon}} [[Hydraulic Design of Spillways (EM 1110-2-1603)\|Hydraulic Design of Spillways (EM 1110-2-1603) (U.S. Army Corps of Engineers)]]~~		{{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, 2022]]
	{{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) (~~Bureau~~ of ~~Reclamation~~)]]		{{Document Icon}} [[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]
	{{Document Icon}} [[Design of Small Dams\|Design of Small Dams ~~(Bureau of Reclamation)~~]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR, 1987]]

	<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite. -->		<!-- In the location of an in text citation, simply enclose the citation as follows: <ref> citation </ref>. Citations will automatically populate. Learn more at https://www.mediawiki.org/wiki/Help:Cite. -->

Grichards at 21:53, 13 December 2022

2022-12-13T21:53:22Z

← Older revision		Revision as of 21:53, 13 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
	“Water flowing over a spillway or through a sluiceway is capable of causing severe erosion of the stream bed and banks below the dam. Consequently, the dam and its appurtenant works must be so designed that harmful erosion is minimized… The channel downstream should have adequate capacity to carry most flows from reservoir releases. After the water has lost most of its energy in the energy-dissipating devices, it is usually transported downstream through the natural channel to its destination points. With the expected release rates, the channel should be able to resist excessive erosion and scour and have a large enough capacity to prevent downstream flooding except during large floods”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>

	“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

Grichards at 21:51, 13 December 2022

2022-12-13T21:51:29Z

← Older revision		Revision as of 21:51, 13 December 2022
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	<!-- Introductory paragraph or topic page summary -->		<!-- Introductory paragraph or topic page summary -->
			“Water flowing over a spillway or through a sluiceway is capable of causing severe erosion of the stream bed and banks below the dam. Consequently, the dam and its appurtenant works must be so designed that harmful erosion is minimized… The channel downstream should have adequate capacity to carry most flows from reservoir releases. After the water has lost most of its energy in the energy-dissipating devices, it is usually transported downstream through the natural channel to its destination points. With the expected release rates, the channel should be able to resist excessive erosion and scour and have a large enough capacity to prevent downstream flooding except during large floods”.<ref name="EM 1110-2-1420">[[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420) \| EM 1110-2-1420 Hydrologic Engineering Requirements for Reservoirs, USACE, 1997]]</ref>

	“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

Grichards at 19:06, 2 December 2022

2022-12-02T19:06:33Z

← Older revision		Revision as of 19:06, 2 December 2022
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	“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“The design of the energy dissipator probably includes more options than any other phase of spillway design. The selection of the type and design details of the dissipator is largely dependent upon the pertinent characteristics of the site, the magnitude of energy to be dissipated, and to a lesser extent upon the duration and frequency of spillway use. Good judgement is imperative to assure that all requirements of the particular project are met. Regardless of the type of dissipator selected, any spillway energy dissipator must operate safety at high discharges for extended periods of time without having to be shut down for emergency repairs. An emergency shutdown of the spillway facility during a large flood could cause overtopping of the dam and/or create unacceptable upstream flooding.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel ~~scout~~ and potential undermining of the stilling basin.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Except in some unusual conditions, an exit channel is required to transition between the stilling basin and the main channel of the river. Since dissipation of the entire spillway discharge energy within the stilling basin is not normally accomplished, enlarging the channel width immediately downstream from the (stilling) basin will assist in dissipating the residual energy. Due to the erosive nature of the highly turbulent flow exiting from a stilling basin, protection of the exit channel bed and side slopes is usually required to prevent channel scour and potential undermining of the stilling basin.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

			Learn more about this topic here: [[Energy Dissipation]]

	==Best Practices Resources==		==Best Practices Resources==

Grichards at 05:08, 18 November 2022

2022-11-18T05:08:34Z

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	__NOTOC__		__NOTOC__
			[[Category:Hydraulic Performance of Spillways]]
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