Regional to Engineering Scale
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Transcript of Regional to Engineering Scale
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Regional to Engineering Scale
HUC8
HUC12Catchment
Engineering HydrologyEngineering Hydraulics
Personal – a flooded home
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Tropical Storm Hermine in Texas Sept 7-8, 2010
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HUC-12 Subwatershed 120702050401 Upper Brushy Creek
Hermine Flooding
Flood Control Dams
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Flood Control Dam
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GIS Hydrology Analysis (HEC-GeoHMS)using 10ft DEM derived from LIDAR
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Engineering Hydraulics
Personal – a flooded home
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Reaches and Rivers in Brushy Creek
South Brushy
Upper Brushy
Lower Brushy
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HEC-RAS Flood Elevation Modelusing 1 ft DEM derived from LIDAR
Cross-Sections for HEC-RAS model
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Steady Flow Solution
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Right Overbank Left Overbank
Channel centerlineand banklines
Cross-section
One-Dimensional Flow Computations
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Flow Conveyance, KLeft Overbank Right OverbankChannel
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Reach Lengths
(1)
(2)
LobRob
Lch
Floodplain
Floodplain
Left to Right looking downstream
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Solving Steady Flow Equations
1. All conditions at (1) are known, Q is known
2. Select h2
3. compute Y2, V2, K2, Sf, he
4. Using energy equation (A), compute h2
5. Compare new h2 with the value assumed in Step 2, and repeat until convergence occurs
h2
(2) (1)
h1
Q is known throughout reach
𝑆 𝑓=(𝑄𝐾 )2
(A)
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Flow Computations
Reach 2Reach 3
Reach 1
• Start at the downstream end (for subcritical flow)
• Treat each reach separately• Compute h upstream, one cross-
section at a time• Use computed h values to
delineate the floodplain
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HEC-RAS Flood Water Surface Elevation Model
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Flood Inundation Map
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Flood Impact on Houses
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Rain Map to Flood MapConnect the Models to Real-Time
Observations in Brushy Creek
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Brushy Creek in ArcGIS Online
http://www.arcgis.com/home/search.html?q=brushy&t=content