# Category: Others

## Design A Detention Basin Using Modified Rational Method in HydroCAD (2 of 2)

After a detention basin (a pond in HydoCAD) is added to the model and its storage is defined as explained in here, the next step is to model and design…

## Design A Detention Basin Using Modified Rational Method in HydroCAD (1 of 2)

A storm water detention basin is usually required for a public or private development project to temporarily store excessive post-development runoff and only release the detained water through control structures…

## Burn a Stream or Raise a Wall in QGIS and WhiteboxTools

Often it is necessary to re-condition a DEM by burning streams or building walls to force a watershed to be delineated with known streams or boundaries (example: NHD streams or…

## Breach Depressions When Pre-processing a DEM for Watershed Delineation Using WhiteboxTools

When performing a watershed delineation in GIS, a DEM usually needs to be pre-processed by "filling" any depressions or sinks (an area lower than its surroundings) to create a hydraulically…

## 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…

## Bridge Pier and Abutment Scour Countermeasure Riprap Design by FHWA Hydraulic Toolbox

Hydraulic Toolbox is a powerful tool to design riprap protection for channel banks, culvert outlets, and bridge scour countermeasures. This post is to focus on bridge pier and abutment scour countermeasure…

## Channel Revetment and Culvert Outlet Protection Riprap Design by FHWA Hydraulic Toolbox

Hydraulic Toolbox is a powerful tool to design riprap protection for channel banks, culvert outlets, and bridge scour countermeasures. A brief introduction about riprap is found here for general reference.…

## 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…

## 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…