GCDAMP- HFE 2012
From Glen Canyon Dam AMP
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| High Flow Experiment- 2012 | |
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- HFE DETAILS -SUMMARY: ---DRAFT---- THIS PAGE IS UNDER CONSTRUCTION
- USBR 2012 HFE LINK
Contents
SUPPORTING DOCUMENTS
COMPLIANCE
SAND TRANSPORT caused by 2012 HFE
2012 Paria River discharge and cumulative sand inputs
- @ RM30 = 390,000 metric tons
- @ RM60 = 380,000 metric tons
- @ RM87 = 540,000 metric tons
- @ RM225 = 970,000 metric tons
- At Diamond Creek (RM225), 1,810,000 metric tons were transported by the Colorado River between July 1, 2012, and July 1, 2013. Thus, 54% of the total delivery of sand to Lake Mead reservoir during this 1-year period occurred during approximately 5 days of the November 2012 HFE. For comparison, 45% of the total delivery of sand to Lake Mead reservoir during calendar year 2008 occurred during the 2008 HFE; the 2004 HFE delivered 40% of the total sand delivered to Lake Mead in calendar year 2004.
- 500,000 tons of sediment is equivelant to filling a football field 230 feet deep (KSalazar)
RESULTS OF 2012 HFE
- 2012 Sandbar tour: deposition following the 2012 high flow on the Colorado River in Grand Canyon
- Substantial Gain to 18 Sandbars--- 55% of sites.
- No Substantial Change in 12 sandbars --- 36% of sites.
- Substantial Loss of 3 sandbars --- 9% of sites.
- RESULTS: 6 Months Later (MAY 2013)
- Most sandbars constructed by the 2012 HFE eroded by May 2013.
- 8 sites were still somewhat larger, 14 sites remained the same, 7 were smaller.
Effects on Resources
- Cultural: No adverse effects to historic properties of the 2012 HFE were identified. (USBR Memo 2013)
- HBC & Native Fish: No measuable positive effect on HBC or other native fish. (Provisional- unpublished data)
- RBT Monitoring: RBT in Glen Canyon moved very little during the period around HFE.
- Foodbase: Initial results do not indicate a strong effect on food base-- but is expected to take longer to recover over the winter period (GCMRC unpublished data)
- Kanab Ambersnail: FWS found in its 2011 BO that this loss of snails/ habitat would not jeopardize the continued existence of the snail
- Whirling Disease: HFE's pose little risk of spreading whirling disease (GCMRC Assessment)
- AZ News Central Video- HFE, Sediment, Jack Schmidt, monitoring LINK
- Feds’ AZ Central News_ Grand Canyon flood a success
- Arizona Game and Fish Wildlife Views article titled "A Changing Grand Canyon: Can high flows help?" (Published October 2012) -Bill Stewart
Contributor: Category: Sediment, Recreation, Water delivery
