- #Hec ras tutorial pdf manual#
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Click on the OK button and a window will open confirming the information you just entered. All project filenames for HEC-RAS are assinged the extension ".prj". You will first need to select your working directory, and then a title (Waller Creek), and file name (Waller.prj). To define a new project, select File/New Project to bring up the main project window: A Project in RAS refers to all of the data sets associated with a particular river system.
Henceforth, this window will be referred to as the main project window. The following window should subsequently appear:
Starting a ProjectYou may start the HEC-RAS program by clicking Start/Programs/Hec/HEC-RAS 2.2. For supercritical flow, the computations would begin at the upstream end of the reach and proceed downstream. The dimensionless Froude number (Fr) is used to characterize flow regime, where: Fr 1 denotes supercritical flow Fr = 1 denotes critical flow For a subcritical flow scenario, which is very common in natural and man-made channels, direct step computations would begin at the downstream end of the reach, and progress upstream between adjacent cross-sections. Whether the computations proceed from upstream to downstream or vice versa, depends on the flow regime. Given the flow and water surface elevation at one cross-section, the goal of the direct step method is to compute the water surface elevation at the adjacent cross-section. The energy equation parameters are illustrated in the following graphic: The change in energy between two cross-sections is called head loss (hL). Stream is the sum of potential energy (Z + Y) and kinetic energy (V2/2g). The basic computational procedure is based on an iterative solution of the energy equation:, which states that the total energy (H) at any given location along the The primary procedure used by HEC-RAS to compute water surface profiles assumes a steady, gradually varied flow scenario, and is called the direct step method. Gradually varied flow is characterized by minor changes in water depth and velocity from cross-section to cross-section. If you recall from hydraulics, steady flow describes conditions in which depth and velocity at a given channel location do not change with time. The results of the model can be applied in floodplain managementC://Introduction to HEC-RAS.htm 1/13Īnd flood insurance studies. HEC-RAS HydraulicsHEC-RAS is a one-dimensional steady flow hydraulic model designed to aid hydraulic engineers in channel flow analysis and floodplain determination.
#Hec ras tutorial pdf series#
The files included are: Waller.dss - HEC-HMS output time series data Waller.g01 - HEC-RAS geometry file Select a working directory on your computer and download these files into it. These data can be downloaded from this website as the file hecras.zip. The data required for the tutorial consist of HEC-RAS input files. This tutorial requires that you have running HEC-RAS version 2.2.
#Hec ras tutorial pdf windows#
The program runs on Windows 95 & 98, NT, and Unix platforms.
#Hec ras tutorial pdf manual#
A user's manual is also available at this location.
#Hec ras tutorial pdf software#
Software and Data RequirementsThe HEC-RAS program can be downloaded free of charge from the Hydrologic Engineering Center's home page at. By the end of this exercise, you should be able to: Import and edit cross-sectional geometry data Import and edit flow data from HEC-HMS Perform a steady flow simulation View and analyze HEC-RAS output Goals of the ExerciseThe primary goal of this exercise is to introduce you to channel flow using the HEC River Analysis System (HEC-RAS). Table of ContentsGoals of the Exercise Software and Data Requirements HEC-RAS Hydraulics Starting a Project Importing and Editing Geometric Data Importing and Editing Flow Data Executing the Model Viewing Results Cleaning Up Introduction to HEC-RASPrepared by Eric Tate Center for Research in Water Resources April 1999