RDII Import into InfoSWMM

Note:  InfoSWMM and H2OMAP SWMM can import any version of the RDII Unit Hydrograph data from SWMM 5.0.001 to SWMM 5.0.021 using the Import manager command.  The difference is that SWMM 5.0.013 and earlier versions had less initial abstraction data and versions after SWMM 5.0.014 had more initial abstraction data. However, the Import Manager detects the version and imports the data correctly. SWMM 5.0.013 stored 9 RTK and 3 Initial Abstraction parameters and later versions 9 RTK and 9 Initial Abstraction parameters.  InfoSWMM will import any format into the current version of InfoSWMM or H20MAP SWMM, which is based on SWMM 5.0.018 but will soon be based on SWMM 5.0.021.

SWMM 5.0.001 to 5.0.013 RDII UH Data

SWMM 5.0.014 to 5.0.021 RDII UH Data

InfoSWMM and H2oMAP SWMM will have 9 RTK and 9 Initial Abstraction Parameters.

How to Import Subcatchments from GIS into InfoSWMM

Note:  How to Import Subcatchments from GIS into InfoSWMM

Step 1:  Add your shapefile using  the Add Data command.

Step 2:  Your imported shape file has no subcatchment data before we initialize the project.

Step 3:  Add your subcatchment data using the GIS Exchange Cluster Import

Step 4:  Now you have the Subcatchments in the DB Tables and can now calculate the area.

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Step 1:  Add your shapefile using  the Add Data command. 

 

 Step 2:  Your imported shape file has no subcatchment data

 Step 3:  Add your subcatchment data using the GIS Exchange Cluster Import

 Step 4:  Now you have the Subcatchments in the DB Tables and can now calculate the area.

We still have to enter 1/10000 to get the right units for subcatchment area using the Auto Area Calculation under Tools preferences.  You first import the shape file and then you turn on Auto Area Calculation, enter a value for the Area Scaling Factor and then use the tool Utilities, Update DB from Map, All Subcatchment to get the Subcatchment Area in hectares.

 

 

A workaround for Hydrology only models that send all subcatchment flow to the pervious area.

Note:  A workaround for Hydrology only models that send all subcatchment flow to the pervious area.  Briefly, v16 had a total infiltration of 14 inches in the attached model but v21 has a total infiltration of 3.5 inches.  The input file uses the attached rainfall file and it routes all of the flow to the pervious area of the subcatchment.  If you plot the losses in v16 and v21 you will see that the losses stop after about 30 days in v21 and continue in v16.  I found that if you put in a small evaporation rate (0.01 inches/day will do) then v21 will duplicate the answers of v16.  Looking at the depths in the subcatchment it seemed in v21 without evaporation that the depth in pervious area was stuck at the depression storage value. 

In summary – the problem seems to be that the losses stop after the depth in the pervious area is above the depression storage unless you have evaporation to sort of kick start the infiltration losses again.

Source Node Tracing In InfoSWMM

Note:  Source Node Tracing in InfoSWMM.  Often you want to know how much flow is being contributed to the flow in a node or link from a single source node.  You can use the Trace with Source Node ID option under the Quality Tab of the Run Manager to select the trace node of the analysis.  The source node will have a concentration of 100 for all dry weather and wet weather inflow.  This includes runoff, RDII inflow, DWF and Inflow Time Series.  The InfoSWMM water quality routing routine will then be used to route the source concentration of 100 throughout the whole network. Later using the Report Manager you can view the source node concentration for any set of nodes and links in your network.  For example, a concentration of 40 percent means that 40 percent of the flow in the node or link comes from your designated source node (see below).