us army corps of engineers building strong missouri river basin cooperative plains snow survey...
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US Army Corps of EngineersBUILDING STRONG®
Missouri River BasinCooperative Plains Snow SurveyKevin Grode, P.E.Reservoir Regulation Team LeadMissouri River Basin Water Management
Northwestern Division, U.S. Army Corps of Engineers
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Cooperative Plains Snow Survey Periodic plains snow survey
Depth & SWE Two-week frequency Standardized method & reporting
Volunteer surveyors Northern Plains in Missouri Basin
Stationary sites where surveyors are available Supports flood, runoff/water-supply, and
reservoir release forecasts
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Cooperating Agencies
State of North Dakota & South Dakota County Emergency Managers National Weather Service U.S. Army Corps of Engineers U.S. Geological Survey Private citizens
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Data Uses
NOAA Snow model verification (NOHRSC) MRBWM short/long-term forecasting
►Monthly volume forecasts►Modeled snowmelt runoff forecasting►Aid regulation decisions
Emergency management decisions
Survey Equipment 40-inch snow tube* Spring or digital scale Sample bucket Shovel Snow survey data sheet Pick axe
* Omaha District design, locally fabricated
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Snow depth/water equivalent from composite sample
Frost depth & estimated soil moisture
Ground ice thickness
Survey Data
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2011 Survey Network
77 individual locations sampled►38 repeat locations►27 supplemental locations
Surveyor profile►6 USACE reservoir projects►5 National Weather Service offices►14 county and state governments or private
citizens►Omaha District personnel
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2012 Snow Survey
Surveys scheduled every two weeks from Jan. 3 – Apr. 2
Due to lack of plains snow, surveys will commence if/when significant snow develops
Data posted to MRBWM website Data will be shared with NOHRSC & all
cooperators
Plains Snowpack20 January 2012
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Source: NOAA - National Operational Hydrologic Remote Sensing Center
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www.nwd-mr.usace.army.mil/rcc/
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We need volunteers!!
The Corps will provide a snow tube
and digital scale. You provide a bucket and
your time.
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Missouri River Basin Snowmelt Models
Fort Peck
Garrison
Oahe
Fort Randall
Gavins Point
St. Louis
Nebraska City
Sioux City
Montana
Kansas
Iowa
Nebraska
South Dakota
Wyoming
Missouri
Colorado
NorthDakota
Knife RiverHeart RiverGrand RiverMoreau River
James RiverBig Sioux River
Gridded Snowmelt ModelingNOHRSC SNODAS
Model
CRRELGridded Snow
Products
Gridded Temperature
Gridded Precipitation
+ +
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Assessing Runoff from Plains Snow
Modeling …Quality of input = Quality of output► Current conditions► Forecasted conditions
Basin / Climate Conditions► Conditions vary over large upper basin area► Soil moisture, frost depth, evapotranspiration► Land use changes (tiling, vegetation)► Weather forecast accuracy > 1 week
►Collaboration / Patience
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Questions
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