Hydraulic Performance of Outlet Works - Revision history

Jeremy.franz@state.co.us at 23:04, 23 January 2026

2026-01-23T23:04:22Z

← Older revision		Revision as of 23:04, 23 January 2026
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	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]

			== Other Resources ==
			{{Document Icon}} [[Simple Steps to Siphoning \| Simple Steps to Siphoning, WDETN]]

	==Trainings==		==Trainings==

Jeremy.franz@state.co.us: Reverted edits by Jeremy.franz@state.co.us (talk) to last revision by Mpollei@gfnet.com

2026-01-23T23:02:22Z

Reverted edits by Jeremy.franz@state.co.us (talk) to last revision by Mpollei@gfnet.com

← Older revision		Revision as of 23:02, 23 January 2026
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	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]

	~~== Other Resources ==~~
	~~{{Document Icon}} [[Simple Steps to Siphoning \| Simple Steps to Siphoning, WDETN]]~~

	==Trainings==		==Trainings==

Jeremy.franz@state.co.us at 23:00, 23 January 2026

2026-01-23T23:00:26Z

← Older revision		Revision as of 23:00, 23 January 2026
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	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]

			== Other Resources ==
			{{Document Icon}} [[Simple Steps to Siphoning \| Simple Steps to Siphoning, WDETN]]

	==Trainings==		==Trainings==

Mpollei@gfnet.com at 19:05, 11 July 2023

2023-07-11T19:05:17Z

← Older revision		Revision as of 19:05, 11 July 2023
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) \| Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA~~, 2010~~]]		{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) \| Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA]]
	{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) \| Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA~~, 2007~~]]		{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) \| Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA]]
	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR~~, 1987~~]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR]]
	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR~~, 1984~~]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE~~, 1980~~]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]

	==Trainings==		==Trainings==

Grichards at 23:29, 16 March 2023

2023-03-16T23:29:39Z

← Older revision		Revision as of 23:29, 16 March 2023
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	“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the [[Reservoir Level\|reservoir level]] is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of [[Outlet Works\|outlet works]], the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>		“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the [[Reservoir Level\|reservoir level]] is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of [[Outlet Works\|outlet works]], the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>

	See also: [[Reservoir Drawdown]]		See also: [[Hydrology]] > [[Normal Flow Conditions]] > [[Reservoir Drawdown]]

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

Rmanwaring at 21:00, 19 December 2022

2022-12-19T21:00:24Z

← Older revision		Revision as of 21:00, 19 December 2022
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	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679)\|Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) ~~(Federal Emergency Management Agency)~~]]		{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) \| Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA, 2010]]
	{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675)\|Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) ~~(Federal Emergency Management Agency)~~]]		{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) \| Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA, 2007]]
	{{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]]
	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25)\|Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) ~~(Bureau of Reclamation)~~]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR, 1984]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602)\|Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) ~~(U.S. Army Corps of Engineers)~~]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE, 1980]]

	==Trainings==		==Trainings==
	{{Video Icon}} [[On-Demand Webinar: Inlet and Outlet Hydraulics for Spillways and Outlet Structures]]		{{Video Icon}} [[On-Demand Webinar: Inlet and Outlet Hydraulics for Spillways and Outlet Structures]]
	{{Video Icon}} [[On-Demand Webinar: Terminal Structures and Energy Dissipation at Outlet Works and Spillways]]		{{Video Icon}} [[On-Demand Webinar: Terminal Structures and Energy Dissipation at Outlet Works and Spillways]]


	<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->		<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->

Grichards at 02:17, 18 November 2022

2022-11-18T02:17:57Z

← Older revision		Revision as of 02:17, 18 November 2022
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	__NOTOC__		__NOTOC__
			[[Category:Hydraulics]]
	----		----
	<!-- 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 -->
	“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>		“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the [[Reservoir Level\|reservoir level]] is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of [[Outlet Works\|outlet works]], the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>

	See also: [[Reservoir Drawdown]]		See also: [[Reservoir Drawdown]]

Grichards at 04:17, 17 September 2022

2022-09-17T04:17:49Z

← Older revision		Revision as of 04:17, 17 September 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 -->
	~~==Outlet Works Hydraulics==~~
	“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>		“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>

	==Reservoir Drawdown==		See also: [[Reservoir Drawdown]]
	“Where practicable, reservoir release facilities should be provided to lower the pool to a safe level adequate to correct conditions that might threaten the integrity f the dam.” <ref name ="FEMA93">[[Federal Guidelines for Dam Safety (FEMA P-93) \| FEMA 93 Federal Guidelines for Dam Safety, FEMA, 2004 ]]~~</ref>~~

	“Low level outlets are provided to maintain downstream flows for all levels of the reservoirs operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated.” <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>

	~~==Examples==~~
	~~{{Website Icon}}~~
	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Federal ~~Guidelines for Dam Safety~~ (FEMA P-93)]]		{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679)\|Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) (Federal Emergency Management Agency)]]
	{{Document Icon}} [[Hydraulic Design of ~~Reservoir Outlet Works~~ (EM ~~1110-2-1602~~)]]		{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675)\|Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) (Federal Emergency Management Agency)]]
	{{Document Icon}} [[~~Hydrologic Engineering Requirements for Reservoirs~~ (EM 1110-2-~~1420~~)]]		{{Document Icon}} [[Design of Small Dams\|Design of Small Dams (Bureau of Reclamation)]]
			{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25)\|Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) (Bureau of Reclamation)]]
			{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602)\|Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) (U.S. Army Corps of Engineers)]]
	==Trainings==		==Trainings==
	{{Video Icon}}		{{Video Icon}} [[On-Demand Webinar: Inlet and Outlet Hydraulics for Spillways and Outlet Structures]]
			{{Video Icon}} [[On-Demand Webinar: Terminal Structures and Energy Dissipation at Outlet Works and Spillways]]


	<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->		<!-- For information on notation for in text citations visit https://www.mediawiki.org/wiki/Help:Cite Or simply enclose the citation as shown <ref> citation </ref> in the location of the in text mention. Citations will automatically populate below-->

Cort at 19:47, 15 September 2022

2022-09-15T19:47:36Z

← Older revision		Revision as of 19:47, 15 September 2022
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	{{Website Icon}}		{{Website Icon}}
	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}}		{{Document Icon}} [[Federal Guidelines for Dam Safety (FEMA P-93)]]
			{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602)]]
			{{Document Icon}} [[Hydrologic Engineering Requirements for Reservoirs (EM 1110-2-1420)]]
	==Trainings==		==Trainings==
	{{Video Icon}}		{{Video Icon}}

Cort at 19:23, 12 September 2022

2022-09-12T19:23:42Z

← Older revision		Revision as of 19:23, 12 September 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 -->
	~~Page Summary~~

	==Outlet Works Hydraulics==		==Outlet Works Hydraulics==
	“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>		“The hydraulic analysis of the flow through a flood control conduit or sluice usually involves consideration of two conditions of low. When the upper pool is at low stages, for example during diversion, open-channel flow may occur in the conduit. As the reservoir level is raised, the depth of flow in the conduit increases until the conduit flows full. In the design of outlet works, the number and size of the conduits and the elevations of their grade line are determined with consideration of overall costs. The conduits are usually designed to provide the required discharge capacity at a specified reservoir operating level, although adequate capacity during diversion may govern in some cases. Conduits should normally slope downstream to ensure drainage. The elevation of good foundation materials may govern the invert elevation of conduits for an embankment dam.” <ref name ="EM1110-2-1602">[[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| EM 1110-2-1602 Hydraulic Design of Reservoir Outlet Works, USACE, 1980]]</ref>
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	“Low level outlets are provided to maintain downstream flows for all levels of the reservoirs operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated.” <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>		“Low level outlets are provided to maintain downstream flows for all levels of the reservoirs operational pool. The outlets may also serve to empty the reservoir to permit inspection, to make needed repairs, or to maintain the upstream face of the dam or other structures normally inundated.” <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>

	~~Info~~

	==Examples==		==Examples==

← Older revision		Revision as of 19:05, 11 July 2023
Line 8:		Line 8:

	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) \| Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA~~, 2010~~]]		{{Document Icon}} [[Technical Manual: Outlet Works Energy Dissipators (FEMA P-679) \| Technical Manual: Outlet Works Energy Dissipators (FEMA P-679), FEMA]]
	{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) \| Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA~~, 2007~~]]		{{Document Icon}} [[Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675) \| Technical Manual: Plastic Pipe Used in Embankment Dams (FEMA P-675), FEMA]]
	{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR~~, 1987~~]]		{{Document Icon}} [[Design of Small Dams \| Design of Small Dams, USBR]]
	{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR~~, 1984~~]]		{{Document Icon}} [[Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25) \| Hydraulic Design of Stilling Basins and Energy Dissipators (EM 25), USBR]]
	{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE~~, 1980~~]]		{{Document Icon}} [[Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602) \| Hydraulic Design of Reservoir Outlet Works (EM 1110-2-1602), USACE]]

	==Trainings==		==Trainings==