Difference between revisions of "The HFE Page"
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*[http://www.usbr.gov/uc/rm/gcdHFE/ USBR HFE Page] | *[http://www.usbr.gov/uc/rm/gcdHFE/ USBR HFE Page] | ||
*[https://www.usgs.gov/centers/sbsc/science/high-flow-experiments-colorado-river?qt-science_center_objects=0#qt-science_center_objects GCMRC HFE Page] | *[https://www.usgs.gov/centers/sbsc/science/high-flow-experiments-colorado-river?qt-science_center_objects=0#qt-science_center_objects GCMRC HFE Page] | ||
− | |||
*[[GCDAMP Sediment| The Sediment Page]] | *[[GCDAMP Sediment| The Sediment Page]] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf 2023 Proposal to Amend the High-Flow Experiment Protocol and Other Considerations ] | ||
+ | *[http://www.usbr.gov/uc/envdocs/ea/gc/HFEProtocol/ Environmental Assessment for the Development and Implementation of a Protocol for High-flow Experimental Releases from Glen Canyon Dam, Arizona, 2011 - 2020] | ||
+ | *[https://www.usbr.gov/uc/DocLibrary/Memos/20240326-EstablishmentInterimOperatingGuidanceGlenCanyonDamLowReservoirLevels-TechnicalDecisionMemo-508-TSC.pdf Technical Decision Memo: Establishment of Interim Operating Guidance for Glen Canyon Dam during Low Reservoir Levels at Lake Powell ] | ||
*Fall HFEs may be connected to the recent increase in [http://gcdamp.com/index.php?title=Brown_Trout brown trout] at Lees Ferry. | *Fall HFEs may be connected to the recent increase in [http://gcdamp.com/index.php?title=Brown_Trout brown trout] at Lees Ferry. | ||
*Spring HFEs increase productivity of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase]. Fall HFEs do not appear to affect the long-term composition of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase] and may scour the foodbase prior to the winter non-growing season. | *Spring HFEs increase productivity of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase]. Fall HFEs do not appear to affect the long-term composition of the [http://gcdamp.com/index.php?title=FOOD_BASE aquatic foodbase] and may scour the foodbase prior to the winter non-growing season. | ||
*HFEs do not appear to directly affect [http://gcdamp.com/index.php?title=Humpback_Chub_Page humpback chub] or the [http://gcdamp.com/index.php?title=FISHERY rainbow trout fishery] but there may be indirect affects tied to foodbase and trout production. | *HFEs do not appear to directly affect [http://gcdamp.com/index.php?title=Humpback_Chub_Page humpback chub] or the [http://gcdamp.com/index.php?title=FISHERY rainbow trout fishery] but there may be indirect affects tied to foodbase and trout production. | ||
− | *[[Sediment Mass Balance for HFE | + | *[[Sediment Mass Balance for HFE considerations- Model explanation| Sediment Mass Balance for HFE considerations- Model explanation]] |
*[[GCDAMP Rapid Response Learning Page| Rapid Response HFE Page]] | *[[GCDAMP Rapid Response Learning Page| Rapid Response HFE Page]] | ||
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− | * | + | *A 2023 Fall HFE was not conducted for lack of sediment |
− | + | *[[The 2023 Spring HFE| The 2023 Spring HFE]] | |
− | + | *[[A 2022 Fall HFE| A 2022 Fall HFE]] was not conducted due to the discovery of [http://gcdamp.com/index.php/Smallmouth_Bass_Page smallmouth bass] in Glen Canyon (1,600,000 mt) | |
− | *[[The | + | *[[A 2022 Spring HFE| A 2022 Spring HFE]] was not conducted for lack of sediment |
− | + | *[[A 2021 Fall HFE| A 2021 Fall HFE]] was not conducted due to low reservoir elevations (1,492,000 mt) | |
− | + | *[[A 2021 Spring HFE| A 2021 Spring HFE]] was not conducted for lack of sediment | |
− | *[ | + | *[http://gcdamp.com/index.php?title=Spring_Disturbance_Flow The 2021 Spring Disturbance Flow] |
− | + | *[[The 2020 Fall HFE| A 2020 Fall HFE]] was not conducted for lack of sediment | |
− | + | *[[The 2020 Spring HFE| A 2020 Spring HFE]] was not conducted for lack of sediment | |
− | + | *[[The 2019 Fall HFE| A 2019 Fall HFE]] was not conducted for lack of sediment | |
− | *[ | + | |
− | *[ | + | |
− | *[ | + | |
− | *[http://gcdamp.com/index.php?title= | + | |
− | *[ | + | |
− | *[[The | + | |
*[[The 2018 Fall HFE]] (60h) | *[[The 2018 Fall HFE]] (60h) | ||
− | *[[The | + | *[[The 2017 Fall HFE| A 2017 Fall HFE]] was not conducted for lack of sediment |
+ | *[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2016 The 2016 Fall HFE] | ||
+ | *[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2015 A 2015 Fall HFE] was canceled due to the discovery of [http://gcdamp.com/index.php?title=Green_Sunfish_Page green sunfish] in Glen Canyon | ||
+ | *[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2014 The 2014 Fall HFE] (1,213,000 mt) | ||
+ | *[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2013 The 2013 Fall HFE] (1,860,000 mt) | ||
+ | *[http://gcdamp.com/index.php?title=GCDAMP-_HFE_2012 The 2012 Fall HFE] (slow downramp) | ||
+ | *The 2011 Equalization flows | ||
+ | *[http://gcdamp.com/index.php?title=Near_Shore_Ecology_(NSE)_Study The 2009-11 Fall Steady Flow Experiment] | ||
+ | *[http://digitalcommons.usu.edu/cgi/viewcontent.cgi?article=1153&context=govdocs The 2008 Spring HFE] | ||
+ | *[https://pubs.usgs.gov/fs/2011/3012/ The 2004 Fall HFE] | ||
+ | *[[The 2000 Low Summer Steady Flow Experiment| The 2000 Low Steady Summer Flow Experiment (LSSF)]] | ||
+ | *The 1997 Experimental Flows | ||
+ | *[[The 1996 Spring HFE]] | ||
+ | *The 1990-91 Experimental Flows | ||
+ | *[http://www.riversimulator.org/Resources/GCDAMP/GCDAMPchronicle/1983FloodGCDhannon.pdf The 1983-86 Floods] | ||
+ | *[[The 1965 Reservoir Equalization and Channel Cleaning Floods]] | ||
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+ | '''2023''' | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2023-11-08-twg-meeting/20231108-HFEProtocolFall2023-508-UCRO.pdf HFE Protocol for Fall 2023] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-TWGHFEProtocolMotion-508-UCRO.pdf TWG HFE Protocol Motion] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-April2023High-FlowExperimentPreliminaryResults-508-UCRO.pdf April 2023 High-Flow Experiment (HFE) Preliminary Results] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-BackgroundInformationProposalAmendHigh-FlowExperimentProtocol-508-UCRO.pdf Background Information for "Proposal to Amend the High-Flow Experiment (HFE) Protocol"] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-PreliminaryFieldReportAprilHigh-FlowExperiment-508-UCRO.pdf Preliminary Field Report from the April High-Flow Experiment] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf Proposal to Amend the High-Flow Experiment Protocol and Other Considerations] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-08-17-amwg-meeting/20230817-ProposalAmendHigh-FlowExperimentProtocolOtherConsiderations-508-UCRO.pdf Proposal to Amend the High-Flow Experiment Protocol and Other Considerations] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-April2023HighFlowExperimentPreliminarySandbarResults-508-UCRO.pdf April 2023 High-Flow Experiment Preliminary Sandbar Results] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2023-06-15-twg-meeting/20230615-PreliminaryFieldReportsAprilHighFlowExperiment-508-UCRO.pdf Preliminary Field Reports from the April High-Flow Experiment ] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2023-04-13-twg-meeting/20230413-ChargeCreateProcessAmendHFEProtocol-508-UCRO.pdf Charge to create a process to amend the HFE protocol] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/amwg/2023-02-16-amwg-meeting/20230216-OverviewProjectsABLEvaluationHigh-FlowExperimentsDuringAridification-508-UCRO.pdf Overview of Projects A, B, and L and Evaluation of High-Flow Experiments During Aridification] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2023-01-26-twg-meeting/20230126-AnnualReportingMeeting-OverviewEvaluationHigh-FlowExperimentsDuringAridification-508-UCRO.pdf Project B Overview and Evaluation of High-Flow Experiments During Aridification] | ||
+ | |||
+ | '''2022''' | ||
+ | *[[Media:Grams_HFE_discussion_20220901.pdf| Evaluation of High-Flow Experiments under conditions of low flows and low reservoir elevations]] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2022-01-13-twg-meeting/20220113-AnnualReportingMeeting-EffectsHigh-flowExperimentsDamReleasesSandbarErosionDepositionMarbleGrandCanyons-508-UCRO.pdf The Effects of High-flow Experiments and Dam Releases on Sandbar Erosion and Deposition in Marble and Grand Canyons ] | ||
+ | |||
+ | '''2021''' | ||
+ | *[[Media:Grams 2021 Geomorphic.pdf| Mueller and Grams, 2021, A morphodynamic model to evaluate long‐term sandbar rebuilding using controlled floods in the Grand Canyon: Geophysical Research Letters]] | ||
'''2020''' | '''2020''' | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-High-FlowExperimentsSedimentModeling-508-UCRO.pdf HFE Sediment Modeling ] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-CarlisleEcoSigDimSpringFreshets.pdf Ecological Significance of Diminished Spring Freshets ] | ||
+ | *[https://www.usbr.gov/uc/progact/amp/twg/2020-06-24-twg-meeting/20200624-Grams-TWG.pdf Evaluating the Frequency of Triggered Spring High Flow Experiments Assumed in the LTEMP ] | ||
*[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-PotentialSpringHighFlowExperiment%E2%80%93StatusResourcesExperimentalPlan-Presentation-508-UCRO.pdf Potential Spring High Flow Experiment – Status of Resources and Experimental Plan ] | *[https://www.usbr.gov/uc/progact/amp/twg/2020-01-13-twg-meeting/20200113-AnnualReportingMeeting-PotentialSpringHighFlowExperiment%E2%80%93StatusResourcesExperimentalPlan-Presentation-508-UCRO.pdf Potential Spring High Flow Experiment – Status of Resources and Experimental Plan ] | ||
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− | One area that has been a source of recent discussion has been the question of planned high releases from Glen Canyon Dam for such purposes as "beach habitat building flows." The Department expects the AMWG to work and provide its recommendations within the following context. Since the GCPA is clear that it was not intended to modify the compacts or "the provisions of the Colorado River Storage Project Act of 1956 and the Colorado River Basin Project Act of 1968 that govern allocation, appropriation, development, and exportation of the waters of the Colorado River Basin" (GCPA, section 1802(b)), any operational changes under the auspices of the GCPA are clearly subordinate to and must fit within the constraints of those provisions. Historically, there have been differences of legal opinion over some related issues, such as whether releases of water above power plant capacity, if made for authorized purposes, can be considered as not constituting "spills" within the meaning of section 602(a) of the Colorado River Basin Project Act of 1968 and the Operating Criteria implemented pursuant to section 602, and more recently over whether the GCPA "amends" existing law by adding additional authorized purposes for the operation of Glen Canyon Dam. These legal issues have not been finally resolved, but given the limitations provided in the ROD, the Glen Canyon Dam operating criteria, and the 1996 agreement between the Department and the Basin States, it is believed that they have been adequately addressed | + | One area that has been a source of recent discussion has been the question of planned high releases from Glen Canyon Dam for such purposes as "beach habitat building flows." The Department expects the AMWG to work and provide its recommendations within the following context. Since the GCPA is clear that it was not intended to modify the compacts or "the provisions of the Colorado River Storage Project Act of 1956 and the Colorado River Basin Project Act of 1968 that govern allocation, appropriation, development, and exportation of the waters of the Colorado River Basin" (GCPA, section 1802(b)), any operational changes under the auspices of the GCPA are clearly subordinate to and must fit within the constraints of those provisions. Historically, there have been differences of legal opinion over some related issues, such as whether releases of water above power plant capacity, if made for authorized purposes, can be considered as not constituting "spills" within the meaning of section 602(a) of the Colorado River Basin Project Act of 1968 and the Operating Criteria implemented pursuant to section 602, and more recently over whether the GCPA "amends" existing law by adding additional authorized purposes for the operation of Glen Canyon Dam. These legal issues have not been finally resolved, but given the limitations provided in the ROD, the Glen Canyon Dam operating criteria, and the 1996 agreement between the Department and the Basin States, it is believed that they have been adequately addressed. [https://www.usbr.gov/uc/progact/amp/amwg/2002-07-17-amwg-meeting/Attach_10b.pdf] |
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Latest revision as of 12:55, 8 April 2024
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High-Flow Experimental (HFE) ReleasesPurpose and GoalThe purpose of HFEs is to determine if sandbar building during HFEs exceeds sandbar erosion during periods between HFEs, such that sandbar size can be increased or maintained over several years. LTEMP HFE ProtocolAs described in the LTEMP ROD, HFEs are experimental in nature and are designed to achieve a better understanding of whether, how, and when to incorporate high releases into future dam operations in a manner that maintains or improves beaches, sandbars, and associated habitat. The LTEMP HFE Protocol establishes a decision-making framework consisting of three components: (1) planning and budgeting, (2) modeling, and (3) decision and implementation. Under the LTEMP, HFE releases are restricted to limited periods of the year when the highest volumes of sediment are most likely available for building sandbars. Sediment-triggered HFEs may be made in spring (March or April) or fall (October or November; Figure 1). Fall extended-duration HFEs range from greater than 96 hr to 250 hr. Spring and fall HFEs that are not extended-duration range from less than 1 hr to 96 hr. Proactive HFEs may be implemented in spring or early summer (April, May or June), and have a duration range up to 24 hr. HFE magnitudes range from 31,500 cubic feet per second (cfs) to 45,000 cfs. The frequency of HFEs is determined by tributary sediment inputs, annual release volumes, resource conditions, and decisions of the Department. Extended-duration fall HFEs are limited to a frequency of 4 times total in the 20-year LTEMP period. HFE Sand Budget ModelThe LTEMP HFE Protocol uses predictive models to make recommendations for the magnitude and duration of potential HFEs using real-time measurements and models of sand inflow from the Paria River and forecasted hydrologic data to determine whether suitable sediment and hydrology conditions exist for a high-flow experimental release. A sand transport/budget model (Wright et al. 2010) was used to predict the mass of sand that would be transported by an HFE and to estimate if a proposed HFE would transport more or less sand than had been delivered from the Paria River to the Colorado River during the fall accounting period (July 1 to November 30). Only HFE durations that resulted in a “positive sand balance” were considered. Output of the modeling runs provides the initial recommendation for the magnitude and duration of the HFE. However, because modeling only considers a simple range of possible HFE peak magnitudes and durations, the Protocol includes a review of the model output that may modify the recommended HFE to benefit relevant resources. (2018 HFE Tech Team Report) |
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