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South Platte CWMS Model Missouri Basin Forecasters Meeting January 29, 2014. Brian Twombly, Omaha District, Corps of Engineers. Corps Water Management System (CWMS). Developed by the Hydrologic Engineering Center (HEC). Software that Interfaces: Data Acquisition Data Storage - PowerPoint PPT Presentation
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BUILDING STRONG®
South Platte CWMS ModelMissouri Basin Forecasters Meeting
January 29, 2014
South Platte CWMS ModelMissouri Basin Forecasters Meeting
January 29, 2014
Brian Twombly, Omaha District, Corps of Engineers
BUILDING STRONG®
Corps Water Management System (CWMS)
Developed by the Hydrologic Engineering Center (HEC). Software that Interfaces:
• Data Acquisition• Data Storage• HEC-HMS (rainfall/runoff)• HEC-ResSim (reservoir routing)• RiverWare (river system)• HEC-RAS (hydraulics)• HEC-FIA (economic consequences)
HEC-RTS is the personal computer version of CWMS that interfaces all the models without the database connections.
BUILDING STRONG®
BUILDING STRONG®
HEC-HMS
Three models were developed:• Upper Basin Snow• Upper Basin Rain• Middle Basin Rain
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Upper South Platte- Two different basins: Rain and Snow- Gridded snow and air temp from CRREL and NOHRSC
BUILDING STRONG®
Mid South Platte- Requires an input at the Waterton gage either from the upper HMS or NWS forecast.
BUILDING STRONG®
HEC-ResSim
HMS inflows fed into ResSim ResSim computes reservoir releases for:
►Chatfield►Cherry Creek►Bear Creek
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HEC-RAS
Uses outflow from ResSim in reaches downstream of the reservoirs.
HMS provides flows to other reaches.
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Model Development - GeoRAS
DEM:•2 meter LiDAR data for core Denver Metropolitan area, obtained in 2008. •10 meter DEM outside LiDAR extents, provided by the district.
Centerline Development:•Digitized from aerial imagery for South Platte River and the major contributing tributaries in the basin.•Centerlines in Green.
Cross Section Geometry :•Cross sections in Red.•Developed by RAS team.•Storage Areas in Blue.
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HEC-FIA
Calculates flood damages and loss of life Uses inundations calculated in HEC-RAS
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Data Needs
Forecasted Temperature Grids►CRREL to provide grids from NOHRSC►3 days forecasted temperature►Any other sources of grids?
Historical gridded temperature and precipitation►Could be used to develop spaghetti plots and
probabilistic forecasts.
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Data Needs
NWS Waterton Forecast►6 hour time step►Could be used instead of running the upper
HMS model. How are the radar precipitation grids
ground truthed?
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Questions
Brian Twombly, P.E.
(402)995-2316
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South Platte ResSimSimulations
Sept 2013 Flood Simulation
Transposed rainfall grid for 10-16 Sept 2013
Created new rainfall grid over reservoir watersheds
Developed hydrographs using 75% HMS models
Create a Sept 2013 ResSim simulation using HMS results
BUILDING STRONG®
South Platte ResSimSept 2013 Simulation
Transposed Rainfall Grid
HEC-MetVue, Gage Interp, ArcGis
Created a grid of circles with Excel and ArcGis
Transposed gridded rainfall with MetVue
Re-sampled gridded rainfall by average rainfall for each circle over the time period of the gridded rainfall dss file
Created a new gridded rainfall file with Gage Interp
BUILDING STRONG®
South Platte ResSimSept 2013 Simulation
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Sept 2013 SimulationCherry Creek Basin Storm Centering
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Sept 2013 SimulationDownstream Storm Centering