HEC-RAS: River Analysis System, Version 2.1, 1997. (on Diskette): Fid-Bau Portal

HEC-RAS: River Analysis System, Version 2.1, 1997. (on Diskette)

HEC-RAS (River Analysis System) is an integrated system of software, designed for interactive use in a multi-tasking environment. The system is comprised of a graphical user interface (GUI), separate hydraulic analysis components, data storage and management capabilities, graphical and tabular output, and reporting facilities. HEC-RAS (HEC, 1996) is the successor to the current steady-flow HEC-2 (HEC, 1991) Water Surface Profiles Program. HEC-RAS is designed to perform one-dimensional hydraulic calculations for a full network of natural and constructed channels. The HEC-RAS system will ultimately be able to perform one-dimensional steady flow, unsteady flow, and sediment transport calculations. The basic computational procedure is based on the solution of the one-dimensional energy equation. Energy losses are evaluated by friction (Manning's equation) and contraction/expansion (coefficient multiplied by the change in velocity head). The momentum equation is utilized in situations where the water surface profile is rapidly varied. These situations include mixed flow regime calculations (i.e., hydraulic jumps), hydraulics of bridges, and evaluating profiles at river confluences (stream junctions). The following are some of the new features and program modifications that have been since the last version: - Improved Model Schematic Features - Many new features have been added to the geometric data model schematic. - Inline Weirs and Gated Spillways - This option allows the user to enter a weir and/or a series of gated spillways, as a structure that is directly in line with the main river system. Radial and sluice type gates can be used. Spillway and weir crests can be either Ogee, broad crested, or sharp crested. - Channel Modifications - The user can now perform channel modifications as a series of trapezoidal cuts, which can be performed over a range of cross sections simultaneously. - GIS/CADD Data - Import stream-system schematic information and cross-section data from GIS/CADD systems. - WSPRO Bridge Routines - An option has been added to allow users to use the Federal Highway Administration's WSPRO bridge hydraulics methodology for low flow hydraulics. - Bridge Scour Computations - Bridge scour computations can now be performed. - Two New Culvert Shapes - High Profile Arch and the Low Profile Arch culvert have been added. - New Culvert Features - HEC-RAS now has the capability to model adverse sloping culverts; culverts under supercritical flow conditions; and culverts with mixed flow regime inside of the culvert barrel. - Modify Internal Bridge Cross Section - The user now has the capability to modify the two internal bridge cross sections. - Data Importing Features - Import multiple HEC-2 data sets into existing Geometric data files or the ability to import survey data that is in the USACE standard survey format. - Equivalent Roughness, k Values - You can now enter k value roughness heights instead of Manning's n values. - Improved Control of Lines, Symbols, Colors, and Font Size - Users now have the control to change any line type, thickness, color; symbol type, size, and color, and fill patterns and colors.