Download - Water Year 2010 Review
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Water Year 2010Review
CBRFC Open House August 17, 2010
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October – December Precipitation
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Upper Colorado
Green
San Juan
Upper Colorado
Green
San Juan RioGrande
Upper Colorado
Green
San Juan
January 1, 2010
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January – March Precipitation
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April 1, 2010
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April Precipitation and Temperature
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May 1, 2010
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May Precipitation and Temperature
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June 1, 2010 Snow Water Equivalent
June 1, 2010
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June Precipitation and Temperature
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July Precipitation
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327 KAF98% avg
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139 KAF83% avg
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2175 KAF90% avg
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488 KAF57% avg
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494 KAF69% avg
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247 KAF77% avg
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654 KAF83% avg
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5795 KAF73% avg
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Colorado-Cameo1991-2008 - 15%2010 – 15%
Eagle-Gypsum1991-2008 - 16%2010 – 33%
Blue Mesa Reservoir1991-2008 - 15%2010 – 20%
Fontenelle Reservoir1991-2008 - 19%2010 – 20%
Navajo Reservoir1991-2008 - 13%2010 – 8%
Lake Powell1991-2008 - 17%2010 – 14%
Dillon Reservoir1991-2008 - 20%2010 – 14%
McPhee Reservoir1991-2008 - 21%2010 – 5%
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Some Observations (Craig) 7 days of high flow (6/6-6/13) Near normal/below normal seasonal precipitation Below Normal temperatures in May (slightly below in April)
Melt was delayed Season volumes affected somewhat Seen on:
Roaring Fork Eagle Uncompahgre (a little) Granby (a little) Yampa Big/Little Cottonwood Headwaters of Provo/Weber/Bear/Uinta streams
Did not affect Gunnison/San Juan Rivers Blue Upper Green
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Possible Reasons
• Possible Input errors• Precipitation• Temperature
• Fixes for the future• Running model in calibration mode showed similar errors
• Known SNOW-17 low bias in rapid melt situations• Temperature index model
• Melt of snow probably was atypical• Model is split by elevation zones not aspect
• Significant melt in May in exposed areas• Delay of melt in colder, less exposed areas
• Hypothesis: North facing lower level melted at same time as south facing high level• Not captured by SNOTEL network or model
• Similar error in one other year (1984)
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Possible Solutions
• Areal Extent updates• Distributed models• Late melt = flooding potential