# Category: Others

## Node Overflowing, Surface Flooding and Overland/Street Flow In 1D XPSWMM Modeling

Even if 2D modeling by XPSWMM, HEC-RAS, and InfoWorks has become popular these days, 1D modeling still holds its ground on storm water management and flooding study due to several…

## Pipe Entrance Loss And Exit Loss Coefficients In A Manhole For Modeling

Head Losses (or energy losses) associated with conduits in a storm sewer system include pipe friction losses and minor losses. Pipe friction losses are normally solved by Manning’s equation, while…

## Recondition And Pre-processing DEM For A Better Watershed Delineation

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…

## Watershed Delineation Using TauDEM Toolbox in ArcGIS

TauDEM, developed by Utah State University is a set of tools to extract and analyze hydrologic information from topography as represented by a DEM. TauDEM is a set of standalone command…

## 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…

## Design A Detention Basin Using SCS Hydrology in HydroCAD

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…

## 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 WhiteboxTools

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…