How to Calculate the Freeboard of a Node in InfoSWMM/H2OMAP SWMM from the Model Results

The freeboard for a node in InfoSWMM/H2OMAP SWMM can be calculated with a 5 step process:

1. Copy the Node Rim Elevations from the DB Tables for Junctions to Excel, you need to use the Preference Option Store Absolute Junction Rim to have the absolute elevation and not just the maximum depth of the node (Figure 1).

Figure 1. Copy the Output Report Manager Tables to Excel

2. Run the model and then copy the Maximum HGL from the Junction Summary Output Report Manager table to Excel (Figure 2).

Figure 2.  Copy the Maximum HGL from the Junction Summary Output Report Manager table to Excel.

Figure 2. Copy the Maximum HGL from the Junction Summary Output Report Manager table to Excel.

3. Calculate the Freeboard in Excel as the Rim Elevation minus the Maximum HGL in Excel, this will be either positive or negative depending on whether you are using the surface ponding option. Positive if there is Freeboard and negative if there is flooding (Figure 3).

Figure 3.  Calculate the Freeboard in Excel as the Rim Elevation minus the Maximum HGL.

Figure 3. Calculate the Freeboard in Excel as the Rim Elevation minus the Maximum HGL.

4. Create a new column called Freeboard in the Junction Information DB Table and paste the Freeboard from Excel. You will first have to make a new column called Freeboard and specify the type of number(Figures 4 and 5).

Figure 4.  Make a Freeboard Column in the Node Information Table.

Figure 4. Make a Freeboard Column in the Node Information Table.

Figure 5.  Map Displays or Map Queries using the new Freeboard information column.

Figure 5. Map Displays or Map Queries using the new Freeboard information column.

5. You will now be able to perform Map Displays or Map Queries using the new Freeboard information column (Figure 6).

Figure 6.  Create a new column called Freeboard in the Junction Information DB Table and paste the Freeboard from Excel.

Figure 6. Create a new column called Freeboard in the Junction Information DB Table and paste the Freeboard from Excel.

 

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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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