https://www.usgs.gov/centers/southwest-biological-science-center/science/high-flow-experiments-colorado-river
Now, daily flows of the Colorado River are largely determined by hydroelectric power generation needs and varies between about 8,000-17,000 cubic feet per second (about 60,000-127,000 gallons per second) depending on the time of day, month, and season. Therefore, before Glen Canyon Dam, the Colorado River experienced much higher flood flows and

https://usbr.gov/uc/progact/amp/amwg/2011-02-09-amwg-meeting/Attach_04d.pdf
High-Flow Experiments on the Colorado River Ecosystem Downstream from Glen Canyon Dam, Arizona" Requested by AMWG in AUG 2007, and as part of March GCMRC's 2008 Science Plan implemented by Interior AUTHORS: Paul E. Grams, Theodore A. Kennedy, Theodore S. Melis, Barbara E. Ralston, Chri stopher T. Robinson, John C.

https://pubs.usgs.gov/circ/1366/
Three high-flow experiments (HFEs) were conducted by the U.S. Department of the Interior at Glen Canyon Dam, Arizona, in March 1996, November 2004, and March 2008. These experiments, also known as artificial or controlled floods, were large-volume, scheduled releases of water from Glen Canyon Dam that were designed to mimic some aspects of pre

https://pubs.usgs.gov/fs/2011/3012/fs2011-3012.pdf
November 2004, and March 2008. Research and long-term monitoring have allowed scientists to unravel many, but not all, of the uncertainties that existed about how HFEs might affect downstream river resources. Jet tubes at Glen Canyon Dam release Colorado River water on the morning of March 5, 2008, during a high-flow experiment (HFE).

https://earthobservatory.nasa.gov/images/151320/high-flow-at-glen-canyon-dam
The high-flow experiment was designed to remobilize the sediment in these deposits and sweep it downstream to eroding beaches. Previous high-flow ... Melis, T.S. (2011) Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, Arizona. U.S. Geological Survey Circular, 1366, 147. National Park

http://www.riversimulator.org/Resources/USGS/ThreeExperimentalHighFlowReleases.pdf
Melis, T. S., ed., 2011, Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, Arizona: U.S. Geological Survey Circular 1366, 147 p. iii ... Arizona, in March 1996, November 2004, and March 2008 (figs. 1 and 2). These experiments, also known as artificial or controlled floods, were large-volume

https://www.doi.gov/sites/default/files/archive/news/archive/04_News_Releases/041122a.htm
Under the high-flow test experiment, Reclamation opened the dam's bypass tubes for 90 hours, beginning Nov. 21. ... 2004. The science experiments focus on sediment distribution, native fish and food for aquatic animals. ... Colorado River beaches provide a foundation for terrestrial habitat adjacent to the river as well as a safe and

https://www.sciencedaily.com/releases/2004/11/041123081312.htm
The Department of the Interior's U.S. Geological Survey is collaborating with partner agencies to conduct scientific experiments designed to evaluate the effect of a high-flow release from Glen

https://acwi.gov/sos/pubs/2ndJFIC/Contents/5D_Grams.pdf
GEOMORPHIC RESPONSE OF SANDBARS TO THE MARCH 2008 HIGH-FLOW EXPERIMENT ON THE COLORADO RIVER DOWNSTREAM FROM GLEN CANYON DAM . Paul E. Grams, Hydrologist, U.S. Geological Survey, Southwest Biological Science Center, ... 2004, and 2008 document changes in sandbar volume; and repeat surveys at more than 100 sites document

https://www.usgs.gov/publications/short-term-effects-2008-high-flow-experiment-macroinvertebrates-colorado-river-below
Glen Canyon Dam has dramatically altered the physical environment (especially discharge regime, water temperatures, and sediment inputs) of the Colorado River. High-flow experiments (HFE) that mimic one aspect of the natural hydrograph (floods) were implemented in 1996, 2004, and 2008. The primary goal of these experiments was to increase the size and total area of sandbar habitats that provide bo

https://www.sciencedirect.com/science/article/pii/S0925857414005953
Fig. 8 (a)-(c) present the temperature distribution on high flow experiments in 1996, 2004 and 2008, respectively. From the figures, we can see that the cold temperature effects were mainly dependent on the high-flow duration time. ... Effects of three high-flow experiments on the Colorado River ecosystem downstream from Glen Canyon Dam, 1366

https://pubs.usgs.gov/publication/cir1366
Three high-flow experiments (HFEs) were conducted by the U.S. Department of the Interior at Glen Canyon Dam, Arizona, in March 1996, November 2004, and March 2008. These experiments, also known as artificial or controlled floods, were large-volume, scheduled releases of water from Glen Canyon Dam that were designed to mimic some aspects of pre-dam Colorado River seasonal flooding.

https://www.doi.gov/news/pressreleases/Glen-Canyon-Dam-High-Flow-Experiments-Provide-Insights-for-Future-Flow-Management-of-the-Colorado-River
FLAGSTAFF, Ariz. - High-volume water releases from Glen Canyon Dam can increase sandbar area and volume, but may also result in large increases in non-native rainbow trout downstream of the dam, according to a new U.S. Geological Survey report released today. The report, Effects of Three-High Flow Experiments on the Colorado River Ecosystem Downstream from Glen Canyon Dam, Arizona, documents

https://pubs.usgs.gov/fs/2008/3011/fs2008-3011.pdf
A sandbar along the left shore of the Colorado River near river mile 30 shortly before (top) and shortly after (bottom) the November 2004 high-flow experiment. People and boats indicate scale. G rand Canyon National Park lies approximately 15 miles downriver from Glen Canyon Dam, which was built on the Colorado River just south of the

https://www.usbr.gov/uc/progact/amp/amwg/2015-02-25-amwg-meeting/Attach_HFE02.pdf
High Flow Experiments in the Colorado River Ecosystem downstream from Glen Canyon Dam - insights from sediment transport data Jack Schmidt Utah State University Grand Canyon Monitoring and Research Center Department of Watershed Sciences. 0 50 100 150 200 250 300 350 400

https://academic.oup.com/bioscience/article/61/12/948/390240
The scheduling of experiments can be used to control some factors. For example, high-flow experiments on the Colorado River in the Grand Canyon in 2004 and 2008 were conducted after sediment inputs from the unregulated Paria River (Schmidt and Grams 2011).

https://www.nps.gov/articles/implementing-high-flow-protocol-for-nourishment-of-beaches.htm
On November 18, 2012, the Department of the Interior began increasing the release of water in the Colorado River from Glen Canyon Dam for a high-flow experimental release (HFE) of approximately 42,000 cubic feet per second (cfs) for 24 hours. ... The goal of the high-flow experiment was to move sand a cumulated in the river channel and

https://www.usgs.gov/publications/sandbar-response-marble-and-grand-canyons-arizona-following-2008-high-flow-experiment
Sandbar response in Marble and Grand Canyons, Arizona, following the 2008 high-flow experiment on the Colorado River February 10, 2010 A 60-hour release of water at 1,203 cubic meters per second (m 3 /s) from Glen Canyon Dam in March 2008 provided an opportunity to analyze channel-margin response at discharge levels above the normal, diurnally

http://www.riversimulator.org/Resources/USGS/ListCompletedHFEreportsAugust2010AMWG.pdf
2004, and 2008 is anticipated by early 2011 in fulfillment of Project 7 (Synthesis of knowledge). ... Geomorphic response of sandbars to the March 2008 high-flow experiment on the Colorado River downstream from Glen Canyon Dam, in Hydrology and sedimentation for a changing future; existing and emerging issues (Joint Federal

https://pubs.usgs.gov/of/2010/1022/of2010-1022.pdf
Duration, High-Flow Experiment—Implications of Timing and Frequency of Flood Disturbance on Nonnative Plant Establishment Along the Colorado River Below Glen Canyon Dam. Open-File Report 2010-1022. U.S. Department of the Interior U.S. Geological Survey. ... 1996, 2004, and 2008. A primary purpose of reintroducing flooding to the Colorado

https://www.nps.gov/grca/learn/nature/hfe-23.htm
Sandbar at river mile 45 before (top) & after, the 2012 high-flow. U.S. Geological Survey/Willie Taylor. April 24-27, 2023 - The Department of Interior (DOI), through the Bureau of Reclamation will conduct a High Flow Experiment (HFE) release from Glen Canyon Dam. The HFE will have a peak magnitude release of approximately 39,500 cubic feet per second (cfs) for 72 hours.

https://pubs.usgs.gov/of/2010/1034/of2010-1034.pdf
High-flow experiments (HFEs) from Glen Canyon Dam (fig. 1) have been implemented three times since the inception of the program in 1996 (March 1996, November 2004, and March 2008) to determine whether they are effective at conserving the meager remaining sand supplies that continue to enter the Colorado River below the dam throughout

https://pubs.usgs.gov/sir/2010/5015/
ABSTRACT. A 60-hour release of water at 1,203 cubic meters per second (m 3 /s) from Glen Canyon Dam in March 2008 provided an opportunity to analyze channel-margin response at discharge levels above the normal, diurnally fluctuating releases for hydropower plant operations. We compare measurements at sandbars and associated campsites along the mainstem Colorado River, downstream from Glen