In HEC-RAS 2D, the terrain created from LiDAR DEM often does not have enough details for areas located within a river channel. For better modeling purpose, normally a river bathymetry…

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# Tag : HEC-RAS

## Create a River Channel Surface Using Cross Section Survey Data in HEC-RAS

## Model A Pump Station in HEC-RAS, HydroCAD, XPSWMM, and HEC-HMS

## Create a Curve Number Raster File from Infiltration Layer in RAS Mapper

## Fall Velocity for Live-bed Contraction Scour Calculation Using HEC-18 Equation

## Bridge Scour Analysis By HEC-18 Equations – Local Abutment Scour (1 of 2)

## Bridge Scour Analysis By HEC-18 Equations – Contraction Scour (2 of 2)

## Bridge Scour Analysis By HEC-18 Equations – Local Pier Scour

## Bridge Scour Analysis By HEC-18 Equations – Contraction Scour (1 of 2)

Bridge scour analysis is often required to design a new bridge or evaluate an existing bridge. Bridge scour depth is a critical bridge design component for foundation calculation. The scouring…

## HEC-RAS Lateral Structure Headwater (HW) Position – Bank Station or Overbank

## Introduction to Dam Breach Modeling using HEC-RAS

In HEC-RAS 2D, the terrain created from LiDAR DEM often does not have enough details for areas located within a river channel. For better modeling purpose, normally a river bathymetry…

A storm water pump station (Figure 1) is needed in low areas of a drainage system where drainage by gravity is not possible, such as a depressed roadway segment. Pump…

The SCS Curve Number (CN) is used to quantify infiltration loss during runoff calculation. As illustrated in Figure 1, a curve number should be determined by soil (Hydrologic Soil Groups, or…

To apply the HEC-18 Equation 6.2 (Figure 1) to calculate the live-bed contraction scour depth, the bed material particle D50 fall velocity needs to be determined to estimate the coefficient…

The bridge contraction scour depth and pier scour depth calculations are explained in the following three posts - Horizontal Contraction Scour, Vertical Contraction Scour (Pressure Flow Scour), and Local Pier…

The post here introduces using HEC-18 equation to calculate horizontal contraction scour under non-pressure flow condition and this post is to explain vertical contraction scour (pressure flow scour). When a bridge…

Bridge scour analysis is often required to design a new bridge or evaluate an existing bridge. Bridge scour depth is a critical bridge design component for foundation calculation. The scouring…

In HEC-RAS models, a lateral structure is often used to establish a connection between 1D river reach and a storage area/2D flow area for flow exchanges. A lateral structure is…

Disclaimer: This post is a simple introduction to dam breach modeling using HEC-RAS. A H&H modeler should not perform a dam breach modeling task without consulting experienced H&H and geotechnical…