HEC-RAS Computations

33 Articles

Detailed description of HEC-RAS steady flow and unsteady flow computational procedures, along with tips to consider in constructing a HEC-RAS model.

2D Conveyance Obstructions

Conveyance obstructions can be assigned to the 2D mesh to account for regions that are permanently blocked from conveying flow....

2D Flow Area Connection Issues

A flow area connection can be used to model a hydraulic structure between two adjacent storage areas, a storage area...

2D Ineffective Flow Areas

Ineffective flow areas can be assigned to the 2D mesh to account for regions where the water is not actively...

Defining HEC-RAS Storage Areas

Upstream and downstream boundaries of a river reach can be connected to a reservoir, lake, or other types of large...

HEC-RAS 2D Flow Area Modeling

HEC-RAS 2D flow modeling can be used in a variety of different situations: Detailed 2D channel and floodplain modeling Combined...

HEC-RAS Bridge Modeling

HEC-RAS can be used to model roadway crossings, which can consist of single or multiple bridge openings and culverts. This...

HEC-RAS Flood Result Raster Grids

While GeoHECRAS constructs a flood map representing the area of inundation, it can simultaneously generate an elevation raster grid (or...

HEC-RAS Ineffective Flow Areas

Ineffective flow areas allow the user to define areas of the cross section that will contain water that are not actively being...

HEC‑RAS Bridge Low Flow Computations

The HEC‑RAS bridge computations allow the modeler to analyze a bridge using several different methods without changing the bridge geometry. The...

HEC‑RAS Conveyance Obstructions

Conveyance obstructions allow the user to define areas at a cross section that are permanently blocked from conveying flow. Conveyance obstructions...

HEC‑RAS Culvert Hydraulics Concepts

This article introduces the basic concepts of culvert hydraulics, which are used in the HEC‑RAS culvert computational routines. A culvert is a...

Modified Puls Routing

For unsteady flow models, the HEC‑RAS Modified Puls Routing option can be used to define portions of a river reach that...

Setting Maximum Headwater Parameter

For unsteady flow simulations, hydraulic structures such as bridges and culverts and storage area connections are converted into families of rating curves...