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…
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…
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…
In addition to delineating watersheds (drainage basins) upstream of one or more outlet points using WhiteboxTools' Watershed and UnnestBasins tools as illustrated in this post, WhiteboxTools has three other tools…
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…
In addition to NCHRP 24-20 Abutment Scour Approach, FHWA HEC-18 includes two more widely known abutment scour equations - HIRE Equation and Froehlich's Equation. Since both of them are consistently…
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…
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…
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.…