How to Use the Variable Flow Percentage Flow Splitter in InfoSewer

Figure 1. The divided flow in the normal link and the overflow link.

You can use the Variable Flow Percentage Flow Splitter in InfoSewer to model overflow in a node when the two stage solution in InfoSewer does not have a full pipe in the 1st stage of the solution.  The problem is that the 1st stage of the solution has non full pipes but the 2nd stage in which the flows are calculated has adjusted depths that show the pipes are full and the HGL is high. The flow splitter is used to allow the overflow water from the high HGL to flow into the overflow link to the outfall.

You can do this by having two Flow Split Curves, one for the low flow to the downstream node and one for the overflow to an outfall. The X value of the flow curve is the inflow to the Loading Manhole, the Y value is the flow in the conduit that you desire to have a flow split. Each of the pipes associated with the loading manhole has a different flow split curve.

Here are the steps in the modeling suggestion:

1. Have two curves: (1) One for low flow and (2) One for Higher Flow (Figure 2),

Figure 2. Two Variable Flow Percentage Curves.

2. You can set up the curves to have all of the loading flow go to one or the other link as shown in Figure 1, when the inflow to the loading node is below 5 gpm the flow will go to the downstream link, when the flow is above 5 gpm all of the flow will go to the overflow link to the outfall.

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    About Robert Dickinson

    Robert Dickinson is a Product Sector Leader with Innovyze in the USA for InfoSewer, InfoSWMM and H2OMAP SWMM. He has over 42+ years experience in modeling the key hydrologic, water quality and hydraulic processes involved in urban and surburban drainage design and analysis. He has been very lucky to work with many talented engineers and scientists in his professional life at the University of Florida, XP Software, CDMSmith, the US EPA and at Innovyze Inc which allows him to offer worldwide support, training and sales/adaptation help for the Innovyze Products InfoSWMM, InfoSewer, InfoSWMM 2D, H20Map SWMM, SWMMLive and SWMM features in ICM and ICM SE. Short Time History: Product Sector Leader with @Innovyze for InfoSWMM / InfoSewer, 46+ years w/ SWMM3/4/5 11+ Years w/ @Innovyze! 8+ years @CDMSmith 9 years w/ XPSWMM 17 years @UF Very long bio - https://www.linkedin.com/pulse/my-history-various-versions-swmm-swmm3-swmm4-swmm5-robert-dickinson?trk=prof-post
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