# Tag : HEC-RAS

## HEC-RAS Lateral Structure (2 of 2)

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…

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## Create a River Channel Surface Using Cross Section Survey Data in 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…

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

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…

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

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…

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

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…

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

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…

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

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…

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

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…

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## 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…

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## HEC-RAS Lateral Structure (1 of 2)

In HEC-RAS models, a lateral structure (LS) is often used to establish a connection between 1D river reach (upstream end of a lateral structure) and a storage area/2D flow area/another…

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