GCDAMP- HFE 2012 - Revision history

Cellsworth at 16:50, 8 July 2020

2020-07-08T16:50:46Z

Cellsworth at 16:49, 8 July 2020

2020-07-08T16:49:58Z

Cellsworth at 16:25, 8 July 2020

2020-07-08T16:25:08Z

Cellsworth at 16:23, 8 July 2020

2020-07-08T16:23:01Z

Cellsworth at 20:42, 2 July 2020

2020-07-02T20:42:50Z

Cellsworth at 17:12, 2 July 2020

2020-07-02T17:12:39Z

Cellsworth at 17:11, 2 July 2020

2020-07-02T17:11:17Z

Cellsworth at 17:07, 2 July 2020

2020-07-02T17:07:00Z

Cellsworth at 18:47, 22 January 2019

2019-01-22T18:47:06Z

Cellsworth at 20:58, 24 September 2018

2018-09-24T20:58:54Z

@@ Line 88: / Line 88: @@
 *'''No Substantial Change''' in '''12 sandbars''' --- 36% of sites.
 *'''Substantial Loss''' of '''3 sandbars''' --- 9% of sites.
-*The 2012 HFE with more gradual downramp rate (Table 1) resulted in flatter sandbars than
+*The 2012 HFE with more gradual downramp rate (Table 1) resulted in flatter sandbars than were observed following the 2008 HFE at two of the three sites were topographic surveys were completed after both high flows. At river mile (RM) 9 there was a 9 percent increase in the proportion of the sandbar with slope less than 8 degrees and at RM 30 there was a 17 percent increase in the proportion with slope less than 8 degrees (Table 5). At RM 47 the proportion of the sandbar with slope less than 8 degrees decreased by 9 percent. [https://www.usbr.gov/uc/progact/amp/amwg/2019-03-06-amwg-meeting/20190301-HFE_Extended_Abstracts-Combined_FINAL.pdf]
 were observed following the 2008 HFE at two of the three sites were topographic surveys were
 completed after both high flows. At river mile (RM) 9 there was a 9 percent increase in the
 proportion of the sandbar with slope less than 8 degrees and at RM 30 there was a 17 percent
 increase in the proportion with slope less than 8 degrees (Table 5). At RM 47 the proportion of
 the sandbar with slope less than 8 degrees decreased by 9 percent. [https://www.usbr.gov/uc/progact/amp/amwg/2019-03-06-amwg-meeting/20190301-HFE_Extended_Abstracts-Combined_FINAL.pdf]
 *'''RESULTS: 6 Months Later (MAY 2013)'''

@@ Line 24: / Line 24: @@
 *Available for fall HFE: 542,000 - 33,000 = 509,000
-'''HFE Transport''' [[File:2012 FallHFE UpperMarbleCanyon.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 '''Upper Marble Canyon'''] ]]
+'''HFE Transport''' [[File:2012 FallHFE UpperMarbleCanyon_(1).png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 '''Upper Marble Canyon'''] ]]
 *Paria input (Nov 19 - 24): 1,000
 *Evacuated from Upper Marble Canyon (Nov 19 - 24, lower bound) = -466,000
@@ Line 30: / Line 30: @@
 *Left over in Marble Canyon after HFE (Nov 19 - 24):  509,000 +1,000 - 466,000 + 5,000 = 49,000
-'''Spring Accounting Period''' [[File:2012 FallHFE LowerMarbleCanyon.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 '''Lower Marble Canyon'''] ]]
+'''Spring Accounting Period''' [[File:2012 FallHFE LowerMarbleCanyon_(1).png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 '''Lower Marble Canyon'''] ]]
 *Paria input (Dec 1 to Apr 1) = 50,000
 *Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) = -29,000

@@ Line 88: / Line 88: @@
 *'''No Substantial Change''' in '''12 sandbars''' --- 36% of sites.
 *'''Substantial Loss''' of '''3 sandbars''' --- 9% of sites.
-*The effects of the 2012 HFE, which had lower downramp rate than other HFEs, on sandbar topography was evaluated by analysis of the slope of the sandbar surfaces. For each of the three sites surveyed following the 2012 HFE, we computed sandbar slope as the gradient over a 0.75 m by 0.75 m moving window over a grid with 0.25-m cell size using the “slope” tool in ArcGIS version 10.5.1. We categorized the results into areas with slope greater than 8 degrees and areas with slope less than 8 degrees. The threshold of 8 degrees was used, because that is the approximate threshold for areas considered flat enough to use for camping (Kearsley and others, 1994; Hadley and others, 2018). [https://www.usbr.gov/uc/progact/amp/amwg/2019-03-06-amwg-meeting/20190301-HFE_Extended_Abstracts-Combined_FINAL.pdf]
+*The 2012 HFE with more gradual downramp rate (Table 1) resulted in flatter sandbars than
 *'''RESULTS: 6 Months Later (MAY 2013)'''

@@ Line 88: / Line 88: @@
 *'''No Substantial Change''' in '''12 sandbars''' --- 36% of sites.
 *'''Substantial Loss''' of '''3 sandbars''' --- 9% of sites.
 *'''RESULTS: 6 Months Later (MAY 2013)'''

@@ Line 34: / Line 34: @@
 *Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) = -29,000
 *Evacuated from Lower Marble Canyon (Dec 1 to Apr 1, lower bound) = -6,000
-*Available for spring HFE: 50,000 - 29,000 - 6,000 = 15,000
+*Available for spring HFE: -29,000 - 6,000 = -35,000
 ==HFE Details==

@@ Line 18: / Line 18: @@
 ==Sediment Conditions==
-'''Fall Accounting Period'''
+'''Fall Accounting Period''' [[File:2012 FallHFE Paria.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/station/GCDAMP/09382000#/ '''Paria River gage at Lees Ferry'''] ]]
 *Paria input (July 1 - Nov 18) = 690,000
 *Accumulated in Upper Marble Canyon (Jul 1 - Nov 18, lower bound) = 542,000
@@ Line 24: / Line 24: @@
 *Available for fall HFE: 542,000 - 33,000 = 509,000
-'''HFE Transport'''
+'''HFE Transport''' [[File:2012 FallHFE UpperMarbleCanyon.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09380000/09383050 '''Upper Marble Canyon'''] ]]
 *Paria input (Nov 19 - 24): 1,000
 *Evacuated from Upper Marble Canyon (Nov 19 - 24, lower bound) = -466,000
@@ Line 30: / Line 30: @@
 *Left over in Marble Canyon after HFE (Nov 19 - 24):  509,000 +1,000 - 466,000 + 5,000 = 49,000
-'''Winter Accounting Period'''
+'''Winter Accounting Period''' [[File:2012 FallHFE LowerMarbleCanyon.png|thumb|right|400px|[http://www.gcmrc.gov/discharge_qw_sediment/reach/GCDAMP/09383050/09383100 '''Lower Marble Canyon'''] ]]
 *Paria input (Dec 1 to Apr 1) = 50,000
 *Evacuated from Upper Marble Canyon (Dec 1 to Apr 1, lower bound) = -29,000
@@ Line 75: / Line 75: @@
 == SAND TRANSPORT caused by 2012 HFE ==
 *@ RM30 = 390,000 metric tons
 *@ RM60 = 380,000 metric tons

@@ Line 57: / Line 57: @@
 *Releases will range from 7,000 - 9,000 cfs prior to and after the HFE
 *Lake elevation is projected to decrease by approximately 2.5 feet during the 5-day period
-*Estimated acre feet of water bypassed during HFE:  ''' xx kaf'''
+*Estimated acre feet of water bypassed during HFE:  79,000 af
-*November volume = ''' xx kaf'''
+*November volume =  xx kaf
 '''Costs'''