# Tag : xpswmm

## Node Flooding, Surcharge, and Ponding in PCSWMM and EPA SWMM

In 1D storm sewer network modeling, it is important to understand how a modeling tool handles the system flooding or overflowing which will impact HGL and flow calculations in the…

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

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

## 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 Manningâ€™s equation, while…

## 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…

## SCS Curve Number Method and Its Application in HEC-HMS, XPSWMM, and InfoWorks ICM

SCS Curve Number (CN) method, proposed by USDA Soil Conservation Service (SCS, now known as NRCS), has been widely used for infiltration loss and runoff calculation due to its simplicity…

## SWMM Nonlinear Reservoir Runoff Method and Its Application in XPSWMM and InfoWorks ICM

Unit hydrograph transform method for precipitation-runoff process is widely used by many H&H modeling tools, but EPA SWMM has its own method known as nonlinear reservoir runoff method which treats…

## Initial and Constant & Deficit and Constant Loss Methods and Parameter Estimation

Initial and Constant Loss Method and Deficit and Constant Loss Method are two common infiltration methods in HEC-HMS and they share the same underlying concept, simply put, after the "initial…

## Modified Rational Method Application in HydroCAD and XPSWMM

HydroCAD and XPSWMM have the modified rational method built into the programs and it is very convenient to apply the method in either of the modeling tools. One or more…

## XPSWMM Confusions and Clarifications (2 of 2)

XPSWMM is a popular 1D and 2D hydrologic and hydraulic modeling tool developed by Innovyze. Though originally XPSWMM was designed primarily to model storm sewer network system, it has gained…