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Regional to Engineering Scale HUC8 HUC12 Catchment Engineering Hydrology Engineering Hydraulics Personal – a flooded home.

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Presentation on theme: "Regional to Engineering Scale HUC8 HUC12 Catchment Engineering Hydrology Engineering Hydraulics Personal – a flooded home."— Presentation transcript:

1 Regional to Engineering Scale HUC8 HUC12 Catchment Engineering Hydrology Engineering Hydraulics Personal – a flooded home

2 Tropical Storm Hermine in Texas Sept 7-8, 2010

3 HUC-12 Subwatershed 120702050401 Upper Brushy Creek Hermine Flooding Flood Control Dams

4 Flood Control Dam

5 GIS Hydrology Analysis (HEC-GeoHMS) using 10ft DEM derived from LIDAR

6 Engineering Hydraulics Personal – a flooded home

7 Reaches and Rivers in Brushy Creek South Brushy Upper Brushy Lower Brushy

8 HEC-RAS Flood Elevation Model using 1 ft DEM derived from LIDAR Cross-Sections for HEC-RAS model

9 Steady Flow Solution

10 Right OverbankLeft Overbank Channel centerline and banklines Cross-section One-Dimensional Flow Computations

11 Flow Conveyance, K Left OverbankRight OverbankChannel

12 Reach Lengths (1) (2) L ob R ob L ch Floodplain Left to Right looking downstream

13 Solving Steady Flow Equations 1.All conditions at (1) are known, Q is known 2.Select h 2 3.compute Y 2, V 2, K 2, S f, h e 4.Using energy equation (A), compute h 2 5.Compare new h 2 with the value assumed in Step 2, and repeat until convergence occurs h2h2 (2) (1) h1h1 Q is known throughout reach (A)

14 Flow Computations Reach 2 Reach 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

15 HEC-RAS Flood Water Surface Elevation Model

16 Flood Inundation Map

17 Flood Impact on Houses

18 Rain Map to Flood Map Connect the Models to Real-Time Observations in Brushy Creek

19 Brushy Creek in ArcGIS Online http://www.arcgis.com/home/search.html?q=brushy&t=content


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