Spillway Approach Hydraulics - Revision history

Mpollei@gfnet.com at 15:50, 25 July 2023

2023-07-25T15:50:58Z

@@ Line 3: / Line 3: @@
 [[Category:Hydraulic Performance of Spillways]]
 ----
 “Conveyance features located immediately upstream and downstream of a control structure include approach channels, inlet structures, chutes, conduits, and/or [[tunnels]]. These conveyance features pass flow from the reservoir to the control structure, as well as pass flow from the control structure to the terminal structure. The conveyance feature (such as an approach channel and/or the inlet structure) located immediately upstream of the control structure generally has a different level of concern in terms of significant [[Loading Conditions|loading conditions]] that could lead to damage or failure of this feature resulting in an uncontrolled release of the reservoir. However, it should be noted that (hydraulic) head losses associated with the approach channel and/or the inlet structure should be accounted for in the computation of the discharge capacity of a spillway. It is also important that the approach channel configuration not be vulnerable to [[stability]] issues (such as slope failure during saturated conditions) so that head losses through the approach channel will not increase during flood operations." <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, 2014]]</ref>

Mpollei@gfnet.com at 16:51, 11 July 2023

2023-07-11T16:51:31Z

← Older revision		Revision as of 16:51, 11 July 2023
Line 12:		Line 12:

	<noautolinks>==Best Practices Resources==</noautolinks>		<noautolinks>==Best Practices Resources==</noautolinks>
	{{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}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design, NRCS~~, 2014~~]]		{{Document Icon}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design, NRCS]]
	{{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]]

Rmanwaring at 23:23, 13 December 2022

2022-12-13T23:23:45Z

← Older revision		Revision as of 23:23, 13 December 2022
Line 12:		Line 12:

	<noautolinks>==Best Practices Resources==</noautolinks>		<noautolinks>==Best Practices Resources==</noautolinks>
			{{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}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design, NRCS, 2014]]		{{Document Icon}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design, NRCS, 2014]]
	{{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, 1992]]
	{{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]]

	<!-- 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. -->

Rmanwaring: /* Best Practices Resources */

2022-12-13T23:18:48Z

Best Practices Resources

← Older revision		Revision as of 23:18, 13 December 2022
Line 3:		Line 3:
	[[Category:Hydraulic Performance of Spillways]]		[[Category:Hydraulic Performance of Spillways]]
	----		----
	“Conveyance features located immediately upstream and downstream of a control structure include approach channels, inlet structures, chutes, conduits, and/or [[tunnels]]. These conveyance features pass flow from the reservoir to the control structure, as well as pass flow from the control structure to the terminal structure. The conveyance feature (such as an approach channel and/or the inlet structure) located immediately upstream of the control structure generally has a different level of concern in terms of significant loading conditions that could lead to damage or failure of this feature resulting in an uncontrolled release of the reservoir. However, it should be noted that (hydraulic) head losses associated with the approach channel and/or the inlet structure should be accounted for in the computation of the discharge capacity of a spillway. It is also important that the approach channel configuration not be vulnerable to [[stability]] issues (such as slope failure during saturated conditions) so that head losses through the approach channel will not increase during flood operations." <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, 2014]]</ref>		“Conveyance features located immediately upstream and downstream of a control structure include approach channels, inlet structures, chutes, conduits, and/or [[tunnels]]. These conveyance features pass flow from the reservoir to the control structure, as well as pass flow from the control structure to the terminal structure. The conveyance feature (such as an approach channel and/or the inlet structure) located immediately upstream of the control structure generally has a different level of concern in terms of significant [[Loading Conditions\|loading conditions]] that could lead to damage or failure of this feature resulting in an uncontrolled release of the reservoir. However, it should be noted that (hydraulic) head losses associated with the approach channel and/or the inlet structure should be accounted for in the computation of the discharge capacity of a spillway. It is also important that the approach channel configuration not be vulnerable to [[stability]] issues (such as slope failure during saturated conditions) so that head losses through the approach channel will not increase during flood operations." <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, 2014]]</ref>

	“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>
Line 11:		Line 11:
	“Another factor influencing the discharge coefficient of a spillway crest is the depth in the approach channel relative to the design head... As the depth of the approach channel … decreases relative to the design head, the effect of approach velocity becomes more significant. The slope of the upstream spillway face also influences the coefficient of discharge… the flatter upstream face slopes tend to produce an increase in the discharge coefficient. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Another factor influencing the discharge coefficient of a spillway crest is the depth in the approach channel relative to the design head... As the depth of the approach channel … decreases relative to the design head, the effect of approach velocity becomes more significant. The slope of the upstream spillway face also influences the coefficient of discharge… the flatter upstream face slopes tend to produce an increase in the discharge coefficient. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	==Best Practices Resources==		<noautolinks>==Best Practices Resources==</noautolinks>
	{{Document Icon}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design ~~(Natural Resources Conservation Service)~~]]		{{Document Icon}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design, NRCS, 2014]]
	{{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}} [[Hydraulic Design of Spillways (EM 1110-2-1603) \| Hydraulic Design of Spillways (EM 1110-2-1603), USACE, 1992]]
	{{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}} [[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]]

	<!-- 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 18:59, 2 December 2022

2022-12-02T18:59:56Z

← Older revision		Revision as of 18:59, 2 December 2022
Line 3:		Line 3:
	[[Category:Hydraulic Performance of Spillways]]		[[Category:Hydraulic Performance of Spillways]]
	----		----
			“Conveyance features located immediately upstream and downstream of a control structure include approach channels, inlet structures, chutes, conduits, and/or [[tunnels]]. These conveyance features pass flow from the reservoir to the control structure, as well as pass flow from the control structure to the terminal structure. The conveyance feature (such as an approach channel and/or the inlet structure) located immediately upstream of the control structure generally has a different level of concern in terms of significant loading conditions that could lead to damage or failure of this feature resulting in an uncontrolled release of the reservoir. However, it should be noted that (hydraulic) head losses associated with the approach channel and/or the inlet structure should be accounted for in the computation of the discharge capacity of a spillway. It is also important that the approach channel configuration not be vulnerable to [[stability]] issues (such as slope failure during saturated conditions) so that head losses through the approach channel will not increase during flood operations." <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, 2014]]</ref>

	“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <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 17:48, 2 December 2022

2022-12-02T17:48:11Z

← Older revision		Revision as of 17:48, 2 December 2022
Line 3:		Line 3:
	[[Category:Hydraulic Performance of Spillways]]		[[Category:Hydraulic Performance of Spillways]]
	----		----
	~~“[[Spillway Approach\|Spillway~~ approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the ~~[[Spillway Approach\|~~spillway approach]], each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the spillway approach, each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with [[spillways]]... Not all of the designs have produced the intended results. Improper designs have led to [[cavitation]] damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with [[spillways]]... Not all of the designs have produced the intended results. Improper designs have led to [[cavitation]] damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <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 17:45, 2 December 2022

2022-12-02T17:45:59Z

← Older revision		Revision as of 17:45, 2 December 2022
Line 3:		Line 3:
	[[Category:Hydraulic Performance of Spillways]]		[[Category:Hydraulic Performance of Spillways]]
	----		----
	“[[Spillway Approach\|Spillway approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>		“[[Spillway Approach\|Spillway approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and stilling basin. There are three general configurations for the [[Spillway Approach\|spillway approach]], each of which requires a different treatment at the abutments in order to provide acceptable spillway characteristics”. These generally consist of spillways with a deep approach, shallow approach, or confined approach. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with [[spillways]]... Not all of the designs have produced the intended results. Improper designs have led to [[cavitation]] damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with [[spillways]]... Not all of the designs have produced the intended results. Improper designs have led to [[cavitation]] damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <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 05:07, 18 November 2022

2022-11-18T05:07:36Z

← Older revision		Revision as of 05:07, 18 November 2022
Line 1:		Line 1:
	<!-- 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:Hydraulic Performance of Spillways]]
	----		----
	“[[Spillway Approach\|Spillway approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>		“[[Spillway Approach\|Spillway approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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 20:02, 21 October 2022

2022-10-21T20:02:24Z

← Older revision		Revision as of 20:02, 21 October 2022
Line 2:		Line 2:
	__NOTOC__		__NOTOC__
	----		----
	~~“Spillway~~ approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>		“[[Spillway Approach\|Spillway approach]] configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>

	“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with spillways... Not all of the designs have produced the intended results. Improper designs have led to cavitation damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with [[spillways]]... Not all of the designs have produced the intended results. Improper designs have led to [[cavitation]] damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	“Another factor influencing the discharge coefficient of a spillway crest is the depth in the approach channel relative to the design head... As the depth of the approach channel … decreases relative to the design head, the effect of approach velocity becomes more significant. The slope of the upstream spillway face also influences the coefficient of discharge… the flatter upstream face slopes tend to produce an increase in the discharge coefficient. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>		“Another factor influencing the discharge coefficient of a spillway crest is the depth in the approach channel relative to the design head... As the depth of the approach channel … decreases relative to the design head, the effect of approach velocity becomes more significant. The slope of the upstream spillway face also influences the coefficient of discharge… the flatter upstream face slopes tend to produce an increase in the discharge coefficient. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

	==Best Practices Resources==		==Best Practices Resources==
	{{Document Icon}} [[~~Dams~~ National Engineering Handbook: Chapter 50- Earth Spillway Design\|~~Dams~~ National Engineering Handbook: Chapter 50- Earth Spillway Design (Natural Resources Conservation Service)]]		{{Document Icon}} [[National Engineering Handbook: Chapter 50 - Earth Spillway Design \| National Engineering Handbook: Chapter 50 - Earth Spillway Design (Natural Resources Conservation Service)]]
	{{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}} [[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) (Bureau of Reclamation)]]		{{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)]]

	<!-- 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 03:51, 17 September 2022

2022-09-17T03:51:53Z

← Older revision		Revision as of 03:51, 17 September 2022
Line 3:		Line 3:
	----		----
	“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>		“Spillway approach configuration will influence the abutment contraction coefficient, the nappe profile, and possibly the flow characteristics throughout the spillway chute and 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>

			“Crest piers, abutments, and approach configurations of a variety of shapes and sizes have been used in conjunction with spillways... Not all of the designs have produced the intended results. Improper designs have led to cavitation damage, drastic reduction in the discharge capacity, unacceptable waves in the spillway chute, and harmonic surges in the spillway bays upstream from the gates. Maintaining the high efficiency of a spillway requires careful design of the spillway crest, the approach configuration, and the piers and abutments. For this reason, when design considerations require departure from established design data, model studies of the spillway system should be accomplished.” <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

			“Another factor influencing the discharge coefficient of a spillway crest is the depth in the approach channel relative to the design head... As the depth of the approach channel … decreases relative to the design head, the effect of approach velocity becomes more significant. The slope of the upstream spillway face also influences the coefficient of discharge… the flatter upstream face slopes tend to produce an increase in the discharge coefficient. <ref name="EM110-2-1603">[[Hydraulic Design of Spillways (EM 1110-2-1603) \| EM 1110-2-1603 Hydraulic Design of Spillways, USACE, 1992]]</ref>

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