HEC-RAS

HEC-RAS

HEC-RAS (River Analysis System) is a comprehensive hydraulic modeling software developed by the U.S. Army Corps of Engineers Hydrologic Engineering Center. It is a tool for civil engineers and hydrologists to simulate the effects of open channel flow on natural and man-made waterways.

HEC-RAS allows for efficient and accurate hydraulic analysis of river systems.

Features

HEC-RAS offers a wide range of features for hydraulic modeling, including:

• Geometric Data Input: HEC-RAS allows users to define the geometry of waterways, including cross-sectional shapes, bank elevations, and bed elevations.

• Flow Input: HEC-RAS allows users to define steady flow data or unsteady flow hydrographs and the boundary conditions of a channel.

• Hydraulic Structure Input: HEC-RAS allows users to define any hydraulic structures, such as culverts, weirs, and bridges, that may be present in a channel.

• Hydraulic Calculations: HEC-RAS performs one-dimensional steady flow and one- and two-dimensional unsteady flow computations, reporting water surface elevation, water depth, velocity, and energy grade line.

• Scour Analysis: The Hydraulic Design functions include bridge scour computations that estimate the potential erosion of the channel bed at bridges.

• Floodplain Analysis: HEC-RAS can calculate floodplain inundation and flood depths, and RAS Mapper displays them as maps over terrain data.

• Sediment Transport: HEC-RAS can compute sediment transport and mobile bed changes, such as erosion and deposition along a channel.

• Water Quality: HEC-RAS can model water temperature and other water quality parameters along a river.

• Pipe Networks: Recent versions can model stormwater pipe networks together with two-dimensional surface flow.

• Output: HEC-RAS can produce a variety of output formats, including tables, graphs, and GIS layers.

• Licence: HEC-RAS is free public domain software. HEC does not provide technical support to users outside the Corps of Engineers, but it accepts bug reports.

HEC-RAS is a powerful and comprehensive hydraulic modeling software package. It has a wide range of features and tools that make it ideal for civil engineers and hydrologists who need to simulate the effects of open channel flow on waterways.