New – Five Infiltration Options Now in InfoSWMM v14.5 and H2OMap SWMM v14.5 for Watershed Modeling – Updated for 2017

Infiltration from the pervious area is a marvelous and from a runoff volume and runoff peak perspective a vital process in modeling the hydrology and ultimately the hydraulics of your Watersheds.  Figure 1 shows the five options available in InfoSWMM and H2OMAP SWMM after the version 14 update which was based on the EPA SWMM 5.1.010 release.  The five infiltration methods are:

wlemoticon-stormcloud Horton (known as the SWMMHorton Method in InfoWorks ICM)

wlemoticon-stormcloud Modified Horton (known as Horton in InfoWorks ICM)

wlemoticon-stormcloud Green Ampt

wlemoticon-stormcloud Modified Green Ampt, which was added to EPA SWMM 5.1

wlemoticon-stormcloud Curve Number or NRCS Curve Number

Not only can you have a different Infiltration option per Model Simulation but you can have different options for each scenario and even for individual Subcatchments in a Scenario (Figure 2).  In InfoSWMM and H2OMAP SWMM, the Soil DB table (Figure 3) shows the individual parameters that apply to Horton, Green Ampt and Curve Number infiltration. The Modified Horton and Green Ampt have the same parameters as the Horton and Green Ampt Soil Types.  The Soil Coverage is specified in the Subcatchment DB Table or individually in the Subcatchment Attribute Browser (AB) as shown in Figure 5.  You can also see the infiltration losses for either multiple Subcatchments or for one Subcatchment across many scenarios using the Advanced Reference Graphics Analysis in Innovyze’s InfoSWMM and H2OMAP SWMM (Figure 4).

Figure 1. Five Infiltration Options in the Run Manager

Figure 1. Five Infiltration Options in the Run Manager

Figure 2. The Marvelous Scenario Explorer in Innovyze Arc GIS products allows you to customize the Infiltration Options per Scenario and Dataset.

Figure 2. The Marvelous Scenario Explorer in Innovyze Arc GIS products allows you to customize the Infiltration Options per Scenario and Dataset.

Figure 3. A key to getting good infiltration results is defining the infiltration parameters in the Soil DB Table.

Figure 3. A key to getting good infiltration results is defining the infiltration parameters in the Soil DB Table.

Figure 5. The feature rich Output Report Manager allows complete customization of the graphs using other scenarios, calibration data and other other output elements.

Figure 4. The feature rich Output Report Manager allows complete customization of the graphs using other scenarios, calibration data and other output elements.

Figure 4. You can also define both your Soil parameters and Soil Coverage for each Subcatchment in the Attribute Browser.

Figure 5. You can also define both your Soil parameters and Soil Coverage for each Subcatchment in the Attribute Browser.

Figure 6. The soil infiltration is important as it connects the pervious area of the Subcatchment to the Groundwater. Infiltration methods can also be applied on a 2D Mesh and used in Low Impact Development (LID) Controls.

Summary

Infiltration from the pervious area is a marvelous and from a runoff volume and runoff peak perspective a vital process in modeling the hydrology and ultimately the hydraulics of your Watersheds.  Figure 1 shows the five options available in InfoSWMM and H2OMAP SWMM after the version 14 update which was based on the EPA SWMM 5.1.010 release.  The five infiltration methods are:

wlemoticon-stormcloud Horton (known as the SWMMHorton Method in InfoWorks ICM)

wlemoticon-stormcloud Modified Horton (known as Horton in InfoWorks ICM)

wlemoticon-stormcloud Green Ampt

wlemoticon-stormcloud Modified Green Ampt, which was added to EPA SWMM 5.1

wlemoticon-stormcloud Curve Number or NRCS Curve Number

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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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