Adding Lateral Structures in HEC-RAS

Paige Brue, P.E., CFM, QSDHEC-RAS

In HEC-RAS, lateral structures are used to model flow that exits a river and moves into a neighboring area—such as another stream, a 2D flow area, or a storage basin. … Read More

Selecting Manning’s n Values for 2D HEC-RAS Models

Paige Brue, P.E., CFM, QSDHEC-RAS

Manning’s roughness coefficient, also commonly referred to as Manning’s n, is an empirical parameter that represents energy loss due to various factors, including friction losses, flow separation, turbulence, and sudden … Read More

Rain-on-Grid Modeling in HEC-RAS

Paige Brue, P.E., CFM, QSDHEC-RAS

Runoff is a crucial component of the hydrologic cycle. Understanding how much water will be conveyed to hydraulic structures, such as storm drains, pipes, culverts, or water bodies, is critical … Read More

4 Tips for New HEC-RAS Modelers

Paige Brue, P.E., CFM, QSDHEC-RAS

HEC-RAS is a great software for hydraulic modeling. One of the reasons is that HEC-RAS is freely available and continues to be updated by the United States Army Corps of … Read More

What is a No-Rise?

Paige Brue, P.E., CFM, QSDHydrology

If your project is located within a Federal Emergency Management Agency (FEMA) floodway, you may be seeking a “no-rise,” which is short for a no-rise certification. In short, a no-rise … Read More

Zone A BFE Determination

Paige Brue, P.E., CFM, QSDHydrology

Zone A is a Federal Emergency Management Agency (FEMA) Special Flood Hazard Area (SFHA). An SFHA, as defined by FEMA, is an area that has a 1% of being inundated … Read More