Since HEC-RAS 6.7, a more detailed 2D bridge modeling method has been introduced - 2D Pressure/Overtopping Approach. Different from the Simplified 1D Rating Curves Approach, this new physics-based "cloned mesh" approach…
Since HEC-RAS 6.7, a more detailed 2D bridge modeling method has been introduced - 2D Pressure/Overtopping Approach. Different from the Simplified 1D Rating Curves Approach, this new physics-based "cloned mesh" approach…
A lot of things can be investigated to improve 2D HEC-RAS model stability. This post covers some of the most critical factors to investigate when a model starts to act…
Starting from Version 6.6, HEC-RAS is able to model stormwater pipe networks including conduits (pipes) and nodes (manholes or inlets). By coupling stormwater pipe networks with HEC-RAS 2D surface, modelers…
HEC-HMS has long been considered as a deterministic model which produces modeling results such as flow rates and volumes by assuming fixed input. A deterministic hydrology model sometimes could not…
A previous post about how to model a pump station can be found here and this post is about how to model a force main on the discharge side of…
SWMM uses a node-link scheme to represent storm sewer networks and the movement of water through such a network is governed by the mass and momentum conservation equations for conduits…
In 1D storm sewer network modeling, it is important to understand how a modeling tool handles the system flooding or overflowing which will impact HGL and flow calculations in the…
The modified puls storage routing technique is widely used to size a detention basin by routing inflow hydrographs (Figure 1). The two unknowns, O2 and S2 , can be solved…
A lateral structure (LS) in HEC-RAS, parallel to the centerline of a river, is often used to connect a river reach to a 2D flow area, a storage area, or…
A watershed average slope value is often needed in some hydrologic calculations, for example, Time of Concentration (TOC) estimation using NRCS Lag Time Method. The slope tool in AcrGIS or…