SWMM5, InfoSWMM

Subject:   H2OMAP Sewer and InfoSewer Water Quality Options

You can model 8 options in H2OMAP Sewer and InfoSewer to simulate various aspects of Water Quality (Figure 1).  If you make the base scenario no water quality you can have the same network, same loading but different aspects of water quality in seven child scenario’s (Figure 2).  The parameters for each water quality option is shown in the Quality Tab of the Simulation Options Dialog.

Figure 1.  Water Quality Simulation Choices in H2OMAP Sewer and InfoSewer.

Figure 2.  Water Quality Simulation Choices in the Scenario Explorer of H2OMAP Sewer and InfoSewer

Note:  The SWMM 5 1D Components in InfoSWMM 2D

InfoSWMM 2D uses standard SWMM 5 components to connect the 1D Nodes to the 2D Mesh.  A bottom outlet orifice at the maximum depth of the node drains to a SWMM 5 Outfall at the fixed elevation equal to the Node Rim Elevation. Flow can go into or out of the Outfall from the 1D element from or to the 2D Mesh. InfoSWMM 2D automatically makes the necessary elements if 2D is used and the new elements are listed in the Hydqua.inp file, which is very similar to the Tab Delimited SWMM 5 Input file. 

The HYDQUA.inp is very similar to the Excel Tab formatted file of SWMM 5 with a few additional sections and added features:

1^st Difference:   The Flood Node Data Section tell the 2D engine which Node has a 1D-2D connection and which 2D mesh element the 1D Node drains to when it is flooded.

[Flood_Node]

10309D      848

80408        131

2^nd Difference:  Outfall Nodes are created for the 2D Mesh Element connected to the 1D Node, the outfalls are Fixed Outfalls and the fixed head is the Node Rim Elevation of the 1D node listed in the Flooded Node Section

[OUTFALLS]

10208  89.900000     FREE  NO

10208A           89.900000     FIXED            94.400000     YES

10208B           89.900000     FREE  NO

10208C           89.900000     FREE  NO

10208D           89.900000     FREE  NO

10208E           89.900000     FREE  NO

10309D_OUTFALL           101.600000            FIXED           111.000000            NO

80408_OUTFALL             120.000000            FIXED           133.400000            NO

3^rd  Difference:  Bottom Outlet Orifices are created to connect the 1D node to the 2D Mesh Element Outfall with the Flood Discharge Coefficient entered by the user and a crest height equal to the maximum depth of the node

[ORIFICES]

OR1@82309B-15009B  82309B      15009B      BOTTOM    0.000000   0.850000   NO

OR1@82309D-82308D  82309D      82308D      SIDE 0.000000   0.850000   NO

10309D_ORIFICE       10309D      10309D_OUTFALL       BOTTOM    9.400000   0.030000   NO

80408_ORIFICE          80408        80408_OUTFALL         BOTTOM    13.400000 0.030000   NO  

Subject:  Advanced SWMM 5 import into InfoSWMM and H2OMAP SWMM

The current version of InfoSWMM and H2OMAP SWMM not only imports the latest SWMM 5 version but it has built in flexibility that allows the user to import selected data sections, model data sections or auxiliary file information such as calibration data files.  This allows you the choice of importing non specific network data that can used in the model of any city, county, shire, town or watershed.  For example,  you can import only these sections without affecting the geometry of your network:

1.      Calibration File Information,

2.      RTC Rules

3.      Aquifers

4.      Snowpacks

5.      Buildup for Water Quality,

6.      Washoff for Water Quality,

7.      Evaporation,

8.      Time Series,

9.       DWF,

10.        Patterns,

11.        RDII

12.        Loadings,

13.        Curves,

14.        LID Controls,

15.        LID Usage,

16.        Pollutants,

17.        Land Uses

Possible uses of this feature would be to have a city wide or company wide library of LID controls, RTC Rules or RDII values.

Figure 1.  Import Dialog with Import Options

Figure 2.  Only names and directories of the Calibration Files was imported

Subject:   How to Compare the Output Manager Statistics in H2OMAP SWMM to the SWMM 5 Output Text File

The value of the total inflow in the text output file is the integrated total for the whole simulation including all time steps.   This is the total volume that is shown in Map Display for Nodes and Links or in the Summary Tables for Nodes and Links.   If you graph the flow or depths in Output Report Manager and use the Field Statistics tool it will only show you the statistics for the SAVED time steps.  However, if you multiply the Sum (Total) Value by the saved interval in seconds you will have another estimate of the total node of link  statistic.  For example, a Sum Total of L/s times seconds yields liters which divided by 1,000 yields ML. 

Figure 2.  Map Display of  the  total link volume in the model run comes from the Node Inflow Summary Table in the Text Report File 

   ***********************

    Node Inflow Summary

  ***********************

   -------------------------------------------------------------------------------------

                                  Maximum  Maximum                  Lateral       Total

                                  Lateral    Total  Time of Max      Inflow      Inflow

                                   Inflow   Inflow   Occurrence      Volume      Volume

  Node                 Type           LPS      LPS  days hr:min    10^6 ltr    10^6 ltr

  -------------------------------------------------------------------------------------

  PN_060               JUNCTION      0.00     2.93     0  07:47       0.000       0.143

Note:  Comparison of the H2OMAP SWMM Hazen Williams Force Main Solution to a Steady State HW Solution 

In this example, we compare the force main head loss in four links in H20Map SWMM to the head loss in a steady state Hazen Williams solution for the same length pipe, diameter and flow (Figure 1).  The H2OMap SWMM model has a large constant dry weather inflow at the wet wells which floods the wet well and causes a constant pump flow to the force main (Figure 2).  The HW calculator is located here http://www.engineeringtoolbox.com/william-hazens-equation-d_645.html and a comparison for HW head loss in PSI for 5000 feet long, 3 inch diameter pipes with HW Coefficients of 130, 120, 110 and 100, respectively, is shown in Table 1.   The SWMM 5 equation loss (PSI Diff) and the PSI loss from the HW calculator are very close for all four links. 

Table 1.  Steady State comparison between HW Calculator and H2OMAP SWMM/SWMM 5 Force Main calculations.

Figure 1.   H2OMAP SWMM Wet Well, Pump, Force Main and Gravity Main Network.

Figure 2.  Constant Pump Flows