A DEM, before it can be used for watershed delineation, often needs to be reconditioned and pre-processed by “filling” any depressions or sinks (an area lower than its surroundings) to…
A DEM, before it can be used for watershed delineation, often needs to be reconditioned and pre-processed by “filling” any depressions or sinks (an area lower than its surroundings) to…
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"…
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…
A simple hydrograph development technique, developed by H. Rooney Malcom in 1980, is often used to design detention facilities serving relatively small watersheds (less than 640 acre or 1.0 sq…
A “nested” design storm distribution, such as SCS Type Type I, IA, II, and III, or the frequency storm in HEC-HMS, is an artificial rainfall distribution using precipitation depth-duration-frequency data.…
Historically Probable maximum precipitation (PMP) rainfall depths for spillway design were estimated using NOAA procedure and methodology such as HMR 51 and HMR 52. However, since HMR 51 and HMR…
HEC-GridUtil is tool developed by USACE Hydrologic Engineering Center to manage and view gridded data stored in DSS files. The Post 1 of 2 here demonstrates on how to start…
Gridded data, either a static single grid or time series grids/grid set, can be imported and stored in HEC-DSS files using Vortex or HMS Gridded data importer. HEC-DSSVue is a…