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HEC-RAS

HEC-RAS. Jordan Furnans and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin. Channel Hydraulics. Q: flow n: Manning’s coefficient A: area of cross section R H : hydraulic radius S f : friction slope P: Wetted perimeter. Uniform Flow.

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HEC-RAS

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  1. HEC-RAS Jordan Furnans and Francisco Olivera, Ph.D. Center for Research in Water Resources University of Texas at Austin

  2. Channel Hydraulics Q: flow n: Manning’s coefficient A: area of cross section RH: hydraulic radius Sf: friction slope P: Wetted perimeter • Uniform Flow

  3. Channel Hydraulics Z: elevation of the bottom of the channel Y: elevation of the water surface V: flow velocity : coefficient g: gravity he: head losses A: area of cross section • Energy Equation • Continuity Equation

  4. Channel Hydraulics Y: elevation of the water surface V: flow velocity : coefficient g: gravity Sf: friction slope S0: bottom slope • Direct Step Method

  5. Overview • Entering data • Viewing results

  6. Starting a Project • HEC-RAS (main) Window • Plan • Geometry • Flow • Open (New) Project window • Title • File name (.prj) • Directory

  7. Reach Network Data • Rivers • Reaches • X sections at river stations • Junctions Within each reach, river station values decrease downstream. River station values are not a measure of distance.

  8. Cross Section Data - Table • X-section stations • Elevation of X-section stations • Distance to next downstream X-section • Manning’s coefficient values • X-section stations of the main channel banks • Contraction and expansion coefficients

  9. Cross Section Data - View • X-section stations • Elevation of X-section stations • Distance to next downstream X-section • Manning’s coefficient values • X-section stations of the main channel banks • Contraction and expansion coefficients

  10. Cross Section Data - Add/Edit • Copy X-section and paste it at another river station • Adjust X-section station values by multiplying by a number, or adding a number • Adjust X-section station elevations by adding a number

  11. L1 L2 Junction Data • Length across the junction. • Computation mode. L1 and L2 are not defined as part of the cross section data.

  12. Steady-Flow Data • Flows are defined at X-sections. • Flow does not change between X-sections. • If flow is not specified at a X-section, then it is assumed that it does not change at the X-section.

  13. Boundary Conditions • Boundary Conditions are specified at: • downstream X-sections for subcritical flow (downstream control) • upstream X-sections for supercritical flow (upstream control)

  14. Plan • A Plan is a unique combination of: • Geometry File (reach network, X-sections and junctions), and • Steady Flow File (flows and boundary conditions).

  15. Overview • Entering data • Viewing results

  16. Results - X-Section • Cross Section Plots: • Water Surface Elevation • Energy Grade Line • Floodplain Extent

  17. Results - Longitudinal Profile • Profile Plots: • Water Surface Elevation • Energy Grade Line

  18. Results - Reach Rating Curve • Flow vs. Water Surface Elevation

  19. Results - Reach Network 3D plots of single or multiple reaches showing: • Water Surface Elevation • Energy Grade Line • Floodplain Extent for single or multiple profiles

  20. Results - Tabular • Hydraulic values at different X-sections

  21. Results - Summary • Hydraulic values at different reaches

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