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Typically flow or stage hydrograph upstream.Upstream and Downstream ends of the river.Hydraulic Property Plot HEC-RAS Version 3.1Ĭross Section Properties Table HEC-RAS Version 3.1Ĭonveyance Subdivisions HEC-RAS Version 3.1īoundary andInitial Conditions Objectives: Know boundary condition options Know initial condition requirements Sources of data for both Geometry Preprocessor HEC-RAS Version 3.1 Sf = friction/energy slope HEC-RAS Version 3.1Ĭonveyance Calculations HEC-RAS Version 3.1Ĭross Section Example HEC-RAS Version 3.1.Instead of calculating hydraulic variables for each cross-section during each iteration, the program interpolates the hydraulic variables from the tables.
#HEC RAS UNSTEADY FLOW SERIES#
Processes geometric data into a series of hydraulic tables and rating curves.
![hec ras unsteady flow hec ras unsteady flow](http://3.bp.blogspot.com/_MyJ2q9mcaEA/Sat5jbDkyII/AAAAAAAAAEQ/w8jbpc61Ekw/w1200-h630-p-k-no-nu/hecras+1.jpg)
#HEC RAS UNSTEADY FLOW TRIAL#
Pre-Computation of Hydraulic Properties Steady – Compute exact hydraulic properties at a section for each trial water surface elevation from the elevation/station points, n-values. X = distance, feet t = time, seconds Distance vs Time Solution Grid 2,2 1,2 t 1,1 x 2,1 HEC-RAS Version 3.1įinite Difference Term Q Q (2,2) - Q(1,2) Q(2,1) - Q(1,1) - = - + ( 1 - ) - X X X = theta weighting factor 0.5 < < 1.0 HEC-RAS Version 3.1 Steady Flow Equations Energy (momentum) Equation: Continuity Equation: HEC-RAS Version 3.1 Unsteady Flow Equations Momentum Equation: Continuity Equation: HEC-RAS Version 3.1
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