#INFOSWMM

Hydraulic Jump, Froude Number and #INSIDE_SWMM5


Introduction – the reason for these series of blogs are as an expanded view of the input, engine and output of #SWMM5 It is a companion to the EPA Documentation which I describe here:

I have noticed based on email questions and postings to the SWMM List Sever (a great resource hosted by CHI, Inc.) that many SWMM 5 users do not know about the really outstanding documentation on SWMM 5 posted on the EPA Website https://www.epa.gov/water-research/storm-water-management-model-swmm It consists of two now and in the near future three volumes on Hydrology, Water Quality, LID’s and SuDS and Hydraulics. The documentation is fantastically complete with detailed background on the theory, process parameters and completely worked out examples for all of the processes in SWMM5. It is truly an outstanding aid to modelers and modellers worldwide. It would benefit you to read them (if you have not already downloaded the PDF files)

This blog shows the three Froude Numbers in a link in SWMM5. The Froude number is computed at the middle of the link but there are actually three computation points in a SWMM5 link – upstream, middle and downstream.  It also shows that if there is a hydraulic jump in a link it will be between the upstream and middle point or middle point and downstream end of the link.

The Froude number is computed at the middle of the link but there are actually three computation points in a SWMM5 link – upstream, middle and downstream

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