Grade Control Sill Spillways - Revision history

Mpollei@gfnet.com at 19:21, 11 July 2023

2023-07-11T19:21:55Z

← Older revision		Revision as of 19:21, 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]]

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Grichards at 00:00, 17 March 2023

2023-03-17T00:00:19Z

← Older revision		Revision as of 00:00, 17 March 2023
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	__NOTOC__		__NOTOC__
	[[Category:~~Uncontrolled~~ Spillways]]		[[Category:Chute Spillways]]
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Grichards: Created page with "NOTOC Category:Uncontrolled Spillways ---- Grade control sill spillways are primarily suited for auxiliary and emergency spillways; however, in some cases, they can function as a service spillway. A grade control sill is a less robust, minimal spillway typically limited to a vertical reinforced concrete wall (sill) th..."

2023-03-16T23:47:11Z

Created page with "__NOTOC__ Category:Uncontrolled Spillways ----  Grade control sill spillways are primarily suited for auxiliary and emergency spillways; however, in some cases, they can function as a service spillway. A grade control sill is a less robust, minimal spillway typically limited to a vertical reinforced concrete wall (sill) th..."

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__NOTOC__
[[Category:Uncontrolled Spillways]]
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Grade control sill [[spillways]] are primarily suited for auxiliary and [[Emergency Spillways|emergency spillways]]; however, in some cases, they can function as a service spillway. A grade control sill is a less robust, minimal spillway typically limited to a vertical [[Reinforced Concrete|reinforced concrete]] wall (sill) that is placed in a trench through an excavated trapezoidal channel. The grade control sill can be constructed in both rock and soil foundations. The grade control sill spillway tends to have limited reserve discharge capacity, given channel armorment could be damaged or fail due to discharges that exceed design levels. Therefore, an important consideration is to limit potential erosion during spillway [[operation]]. In summary, this type of spillway should only be used on low head situations where the hydraulic drop (vertical dimension between the reservoir water surface and the downstream river or stream) can be effectively controlled, including limiting erosion potential. Examples of grade control sill spillways include the service spillway at Reclamation’s Crane Prairie Dam (embankment) and the emergency spillway at Reclamation’s Davis Creek Dam (embankment).<ref name="DS14">[[Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations) | Design Standards No. 14: Appurtenant Structures for Dams (Ch. 3: General Spillway Design Considerations), USBR, 2022]]</ref>

==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]]


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