Spring Disturbance Flow - Revision history

Cellsworth at 23:06, 5 February 2024

2024-02-05T23:06:00Z

Cellsworth at 16:59, 18 August 2022

2022-08-18T16:59:30Z

Cellsworth at 17:33, 15 April 2022

2022-04-15T17:33:07Z

Cellsworth at 20:55, 20 October 2021

2021-10-20T20:55:00Z

Cellsworth at 20:51, 20 October 2021

2021-10-20T20:51:26Z

Cellsworth at 15:06, 13 September 2021

2021-09-13T15:06:53Z

Cellsworth at 21:29, 20 July 2021

2021-07-20T21:29:17Z

Cellsworth at 20:15, 6 July 2021

2021-07-06T20:15:34Z

Cellsworth at 20:04, 6 July 2021

2021-07-06T20:04:09Z

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Cellsworth at 19:59, 6 July 2021

2021-07-06T19:59:36Z

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		+	*[https://www.usbr.gov/uc/progact/amp/amwg/2022-02-10-amwg-meeting/20220210-SpringDisturbanceFlowUpdate-508-UCRO.pdf Spring Disturbance Flow Update ]
	*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-SpringDisturbanceFlowUpdate-508-UCRO.pdf Spring Disturbance Flow Update ]		*[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-SpringDisturbanceFlowUpdate-508-UCRO.pdf Spring Disturbance Flow Update ]

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← Older revision		Revision as of 20:55, 20 October 2021
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	[[File:2021hydrograph.png\|center\|600px]]		[[File:2021hydrograph.png\|center\|600px]]
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-Glen Canyon Dam has altered ecological processes of the Colorado River in Grand Canyon. Before the dam was built, the Colorado River experienced seasonable variable flow rates, including springtime flooding events. These spring floods scoured the river bottom and enhanced natural processes that sustained the Colorado River ecosystem. Since the dam’s construction in 1963, springtime floods have been extremely rare and of low magnitude. Now, after more than 50 years of operation, the apron (underwater portion) of the Glen Canyon Dam requires maintenance. To facilitate this, releases from Glen Canyon Dam will be reduced to 4000 cubic feet per second (cfs), which is about one-third the average for March. This low flow will be immediately followed by a high flow disturbance which will consist of water releases of about 20,150 cfs. This combination of low and high flow disturbance is expected to enhance the natural processes that sustain the Colorado River ecosystem by mimicking springtime pre-dam flooding.[https://www.usgs.gov/centers/sbsc/science/timing-really-everything-evaluating-resource-response-spring-disturbance-flows?qt-science_center_objects=0#qt-science_center_objects]
+A spring disturbance flow is planned at Glen Canyon Dam from March 15 to March 26. It is expected to maximize ecosystem benefits to the Colorado River ecosystem through the Glen, Marble, and Grand canyons, while meeting water delivery requirements and minimizing negative impacts to hydropower production. The spring disturbance flow will not affect the monthly or annual release volumes from Lake Powell through Glen Canyon Dam.
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 To test both spring and fall HFEs, the HFE protocol proposed using two sediment accounting periods.

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 *[https://gcc02.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.bing.com%2Fvideos%2Fsearch%3Fq%3Dglen%2Bcanyon%2Bdam%2Bapron%2Brepair%26qpvt%3Dglen%2Bcanyon%2Bdam%2Bapron%2Brepair%26view%3Ddetail%26mid%3D6C744C6EB36C71D1555F6C744C6EB36C71D1555F%26%26FORM%3DVRDGAR&data=04%7C01%7C%7C20c7cec51bd24ea9e71208d93bf5836c%7C31ae220fb94f463a9cfd15bbc9909df5%7C0%7C0%7C637606747927111599%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C2000&sdata=UgLRa6ewka%2BYb5iedFcnICtICZFV0NZaReW0MFkiYsI%3D&reserved=0 Tailrace Repair at Glen Canyon Dam, Arizona]
 *[https://www.youtube.com/watch?v=LX3ahQW3-ZA USGS - Stream Gage Assessment]
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	'''2021'''		'''2021'''
		+	*[https://www.usbr.gov/uc/progact/amp/twg/2021-04-14-twg-meeting/20210414-SpringDisturbanceFlowInitialReports-508-UCRO.pdf Spring Disturbance Flow – Initial Reports from the Field ]

	'''2020'''		'''2020'''

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 *[[Media:A2_-_20200820_-_AMWGMotionsActionItemsFINAL.pdf| AMWG Motions Action Items FINAL]]
 *[[Media:A0 - 2020.11.17 - Draft AMWG Agenda - NOV20.pdf| Draft AMWG Agenda - NOV20]]
 *[https://www.usbr.gov/uc/progact/amp/amwg/2020-11-17-amwg-meeting/20201117-BudgetAdHocGroupRecommendationProjectO-508-UCRO.pdf Budget Ad Hoc Group Recommendation for Project O Link is to a PDF file – Oct. 8, 2020]
 *[https://www.usbr.gov/uc/progact/amp/amwg/2020-11-17-amwg-meeting/20201117-DraftProject%20O-EvaluatingResourceResponseSpringDisturbanceFlows-508-UCRO.pdf Draft - Project O: Is Timing Really Everything? Evaluating Resource Response to Spring Disturbance Flows Link is to a PDF file – Nov. 10, 2020]
 *[https://www.usbr.gov/uc/progact/amp/amwg/2020-11-17-amwg-meeting/20201117-ProjectOBackgroundRevisions-508-UCRO.pdf Project O – Background and Revisions ]
 *[https://www.usbr.gov/uc/progact/amp/twg/2020-10-15-twg-meeting/20201015-ProjectOReviewRevisions-Presentation-508-UCRO.pdf Project O Review and Revisions ]
 *[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-CarlisleEcoSigDimSpringFreshets.pdf Ecological Significance of Diminished Spring Freshets ]