Breaklines are crucial in HEC-RAS 2D modeling because they control how the cell mesh aligns with important terrain features. This directly improves the accuracy and stability of flow simulations. This…
Breaklines are crucial in HEC-RAS 2D modeling because they control how the cell mesh aligns with important terrain features. This directly improves the accuracy and stability of flow simulations. This…
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…