# Category: Others

## Conduit US and DS Headloss (Entrance Loss and Exit Loss) in InfoWorks

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…

## Peak Flow Validation

Peak flows of different frequencies calculated from hydrologic modeling often need to be validated to gain some confidence on them. There are several ways to validate a peak flow value.…

## Basin Development Factor (BDF) and Its Application in Urban Hydrology

Urbanization has some substantial impacts on a watershed hydrology including increased surface runoff flow rate and volume, quicker to peak, decreased infiltration and evapotranspiration. To account for these effects in…

## Rational Routing in InfoWorks ICM

In addition to various unit hydrograph transform methods and SWMM nonlinear reservoir runoff method, InfoWorks ICM also has a built-in rational routing model for rainfall-runoff process. To utilize the Modified…

## 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…

## Time of Concentration (TOC) Estimation

Time of Concentration (TOC or Tc), one of the most important hydrologic parameters for runoff calculation and modeling, is defined as the time it takes a drop of rainfall to…

## Rainfall-runoff in InfoWorks ICM: Rain-on-Grid on 2D Zone

InfoWorks ICM is a powerful hydrologic and hydraulic modeling tool. As its name suggests, ICM - Integrated Catchment Modelling, InfoWorks ICM is capable of simulating 1D network and 2D surface…

## Rainfall-runoff in InfoWorks ICM: Traditional Subcatchment Hydrology

InfoWorks ICM is a powerful hydrologic and hydraulic modeling tool. As its name suggests, ICM - Integrated Catchment Modelling, InfoWorks ICM is capable of simulating 1D network and 2D surface…