Using GIS with HEC RAS

HEC-RAS has the ability to import three-dimensional river schematic and cross section data created in a GIS or CADD system.While the HEC RAS software only utilizes two dimensional data during the computations,the 3D information is used in the program for display purposes.After the user has completed a hydraulic analysisi,the computed water surface profiles can be exported back to the GIS or CADD system for development and display of a floodplain map.
The importing and exporting of GIS or CADD data is accomplished through the use of formatted ASCII text files,The text files provide a generic way of exchanging data between GIS/CADD systems and HEC -RAS,without adopting any single GIS/CADD system.
The HEC has developed a set of macros for Arc Info(using Arc Macro Language,AML) that will allow a user to write the geometric data in the required format as well as read the HEC-RAS results and perform the floodplain mapping.

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HEC RAS Manual

HEC RAS Working with HEC RAS an overview
HEC RAS is an itergrated package of hydraulic analysis programs,in which the user interacts with the system through the use of a Graphical User Interface.The system is capable of Performing Steady Flow Water surface profile calculations and will include unsteady flow,sediment transport and several hydraulic design computations in the future.
In HEC-RAS terminolgy, a project is a set of data files associated with a particular river system.The modeler can perform any or all of the various types of analyses,included in the HEC RAS package,as part of the project.The data files for a project are categorized as follows;plan data,geometric data,steady flow data,unsteady flow data,sediment data and hydraulic design data.
Contents

• Starting HEC RAS
• Steps in Developing a Hydraulic Model with HEC RAS
• Importing HEC-2 Data
• Reproducing HEC-2 Results
• Getting and Using Help

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Starting new Project HEC RAS

HEC RAS
This Chapter provides an example application ofhow to perfom steady flow water surface profile calculations with HEC-RAS.The user is taken through a step by step procedure of how to enter data,perfom calculations,and view the results.

Contents

• Starting a New Project
• Entering Geometric Data
• Entering Steady Flow Data
• Performing the Hydraulic Calculations
• Viewing Results
• Printing Graphics and Tables
• Exiting the Program

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WATERCAD Manual

Watercad manual

WaterCAD is a powerful yet easy to use program that helps engineers design and analyze complex
pressurized piping systems. WaterCAD’s powerful graphical interface (both in Stand-Alone and
AutoCAD mode) makes it easy to quickly lay out a complex network of pipes, tanks, pumps, and
more. You can use WaterCAD to:
• Perform steady-state analyses of water distribution systems with pumps, tanks, and control
valves.
• Perform extended period simulations to analyze the piping system's response to varying supply
and demand schedules.
• Perform water quality simulations to determine the water source and age, or track the growth
or decay of a chemical constituent throughout the network.
• Perform Fire Flow Analyses on your system to determine how your system will behave under
extreme conditions.
• Use the powerful Scenario Management features to mix and match a variety of "What If?"
alternatives on your system. Create multiple sets of hydraulic, physical property, operational,
initial setting, fire flow, cost, and water quality alternatives. Create and run any number of
scenarios by mixing and matching alternatives, then view and compare the results quickly and
easily with WaterCAD's flexible scenario management feature.


Contents

• What is watercad
• Installation
• Learning WaterCAD
• Contacting Heasted Methods
• WaterCAD Main Menu
• Quick Start Lessons
• Starting a WaterCAD Project
• Laying Out and Editing Tools
• Hydraulic Elements Editor
• Flex Tables
• Scenarios and Alternatives
• Modeling Capabilities
  
• Cost Estimating
• Presenting your Results
  
• Engineering Libraries
  
• GIS and Database Connections
  
• Exchanging Data with CAD Software
  
• Additional Features of the AutoCAD Version
• Appendix A - Frequently Asked Questions
  
• Appendix B - WaterCAD Theory
• Appendix C - Scenario Management Guide
  
• Appendix D - Haestad Methods Software

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HEC RAS output Variables

HEC RAS

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HEC RAS

To create a river hydraulics application with HEC-RAS,you work with projects. A project is a collection files that are used to build a model.This chapter describes projects and how you build and manage them.

Contents

1. Understanding Projects
2. Elements of a Project
3. Creating,Opening,Saving,Renaming and Deleting Projects
4. Project Options

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Steady Flow

Performing Steady Flow Analysis in HEC RAS
This post includes the procedure of calculating steady flow water surface profile.
This chapter is divided into two parts.The first part discusses how to enter steady fow data and boundary conditions.The second part discusses how to develop a plan and perform the calculations.

1. Entering and Editing Steady Flow Data
2. Performing Steady Flow Calculations

Entering and Editing Steady Flow Data
Once all of the geometric data are entered,the modeler can then enter any steady flow data that are required.To bring up the steady flow data editor,select Steady Flow Data from Edit menu on the HEC-RAS main window.The steady flow data editor should appear.

Steady Flow Data
The user is required to enter the following information: the number of profiles to be calculated;the peak flow data(at least one flow for every river reach and every profile); and any required boundary conditions.

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Fluid Mechanics

Dimensional Analysis
In engineering the application of fluid mechanics in designs make much of the use of empirical results from a lot of experiments. This data is often difficult to present in a readable form. Even from graphs it may be difficult to interpret. Dimensional analysis provides a strategy for choosing relevant data and how it should be presented.
This is a useful technique in all experimentally based areas of engineering. If it is possible to identify the factors involved in a physical situation, dimensional analysis can form a relationship between them. The resulting expressions may not at first sight appear rigorous but these qualitative results converted to quantitative forms can be used to obtain any unknown factors from experimental analysis.

Dimensions and units
Any physical situation can be described by certain familiar properties e.g. length, velocity, area, volume, acceleration etc. These are all known as dimensions. Of course dimensions are of no use without a magnitude being attached. We must know more than that something has a length. It must also have a standardised unit - such as a meter, a foot, a yard etc.Dimensions are properties which can be measured. Units are the standard elements we use to quantify these dimensions.
In dimensional analysis we are only concerned with the nature of the dimension i.e. its quality not its quantity. The following common abbreviation are used:

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Hydraulics Modeling

A physical model is a scaled representation of a hydraulic flow situation. Both the
boundary conditions (e.g. channel bed, sidewalls), the upstream flow conditions
and the flow field must be scaled in an appropriate manner.
Physical hydraulic models are commonly used during design stages to optimize a
structure and to ensure a safe operation of the structure. They have an important
further role to assist non-engineering people during the `decision-making' process.
A hydraulic model may help the decision-makers to visualize and to picture the
flow field, before selecting a `suitable' design.
In civil engineering applications, a physical hydraulic model is usually a smaller-
size representation of the prototype (i.e. the full-scale structure) (e.g. Fig. 14.2).
Other applications of model studies (e.g. water treatment plant, flotation column)
may require the use of models larger than the prototype. In any case the model is
investigated in a laboratory under controlled conditions.
Hydraulic modeling cannot be disassociated from the basic theory of fluid
mechanics. To be eefficient and useful, experimental investigations require theoretical
guidance which derives primarily from the basic principles (see Chapter 13) and the
theory of similarity (see the next subsection).
In the present section, we will consider the physical modeling of hydraulic flows:
i.e. the use of laboratory models (with controlled flow conditions) to predict the
behavior of prototype flow situations.
In a physical model, the flow conditions are said to be similar to those in the prototype
if the model displays similarity of form (geometric similarity), similarity of motion
(kinematic similarity) and similarity of forces (dynamic similarity)...

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HECRAS地理空间数据导入导出文件

HECRAS推出三维河流网络和跨sections.This几何描述能力，使人们有可能从现实世界进口不转换通道是从CAD或GIS方案的几何坐标站海拔描述为跨sections.Similarly水面高程计算截面的可以出口到CAD和GIS在那里他们可以用于创建映射模型表面的泛滥。
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HEC RAS Import Export File for Geospatial Data

HEC RAS has introduced 3D geometry for the description of river networks and cross sections.This capability makes it possible to import channel geometry of from CAD or GIS programs without conversion from real world coordinates to station elevation descriptions for the cross sections.Similarly water surface elevations calculated at cross sections can be exported to CAD and GIS where they can be used to create models surfaces for inundation mapping.
...........
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Introduction to HECRAS

Hydrologic Ebngineering Center's River Analysis System(HEC-RAS) allows you to perform one dimensional steady and unsteady flow hyrdraulics. Future Versions support sediment transport calculations.HEC RAS supports one dimensional steady and unsteady flow,water surface profile calculations.
HEC RAS is an itegrated system of software,designed for interactive use in a multi tasking multi user network environment.The system is comprised of a graphical user interface,separate hydraulic analysis components,data storage and management capabilities,graphics and reporting facilites..............
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HEC RAS

HEC RAS
Hydrologic Ebngineering Center's River Analysis System(HEC-RAS) allows you to perform one dimensional steady and unsteady flow hyrdraulics. Future Versions support sediment transport calculations.HEC RAS supports one dimensional steady and unsteady flow,water surface profile calculations.
HEC RAS is an itegrated system of software,designed for interactive use in a multi tasking multi user network environment.The system is comprised of a graphical user interface,separate hydraulic analysis components,data storage and management capabilities,graphics and reporting facilites..............
This Presentation Contains the following chpaters
Getting Started
Entering Cross Section Data
Notes on Cross Section Data
Entering Flow Data
Performing Hydraulic Computations
Low Flow Bridge Modeling
High Flow Bridge Modeling
Adding The Bridge

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