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…
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…
In hydrologic modeling, "nested" storm distributions are widely used such as SCS Type I, IA, II, III, or the frequency storm in HEC-HMS. One of the advantages of a "nested"…
A previous post introduced the design of a detention basin using Modified Rational Method in HydroCAD, and this post is about detention basin design using SCS hydrology in HydroCAD. The…
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…
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…
Often it is necessary to re-condition a DEM by burning streams or raising walls to force a watershed to be delineated with known streams or boundaries (example: NHD streams or…
When performing a watershed delineation in GIS, the 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…