SWMM5, InfoSWMM

Subject:  How to Set Up Hot Start Files in InfoSWMM for a Fixed Boundary Outfall

If you have a fixed boundary outfall condition in your model and want to prevent reverse flow when you run your simulation the best way is to use the Hot Start files to fill up the links and nodes at the start of the simulation.

1^st Step:  Turn off the DWF inflow so that ONLY the flow from outfall enters the network.  Use the Process Models in Run Manager to turn off and turn on the Dry Weather flow.

2nd Step:  Run the simulation first SAVING a Hot Start File using zero initial node depths and link flows.

3rd Step:  Save and Use Hot Start Files until the initial and final volume in your Network stays the same. 

4th Step:  Check the Initial and Final Stored Volume in the output text file

5th Step:  Check to see if you nodes are stable by using a Junction Group Graph

6th Step:  Now Run the Simulation with flows turned an and the network will start out with the Boundary Condition depths and stable flows

Note:  How to Set a Flap Gate in InfoSWMM

 You can set a flap gate in InfoSWMM either by using the attribute browser and changing the Flap Gate Installed to Yes or No or by using the DB Editor and changing the Flag for Flap Gate Installed to Yes by using the Block Edit tool.   The DB method is better for changing many conduits. 

Subject:   H2OMAP Sewer and InfoSewer DB Queries to find Loading Manholes

This Database Query (DB) will find all loading Manholes with a Load1 and a Load2 greater than 0.  InfoSewer has up to ten possible loads in a Manhole.  You can use the DB Query (Figure 1) to create a Query Report to show all of the Manholes with a non zero loading for both Load1 and Load2.  New Queries can be made to show any combination of the ten Manhole Loadings either by altering the DB Query or creating a new DB Query.

Figure 1. DB Query to find Manholes with Load1 and Load2 greater than 0.0

Figure 2.  Query Report for the DB Query

Subject:  How to Model a Vacuum Sewer in SWMM 5  

You can model a vacuum sewer as a gravity pipe connected to a storage node connected to an outlet connected to various pipes in a sawtooth pattern connected to a collection tank with a pump that pumps to a force main.

 1.       Gravity Pipe,

2.       Storage Node,

3.       An Outlet function that works as a function of the depth in the storage node

4.       Series of Pipes in a Sawtooth Pattern,

5.       Collection tank,

6.       Pump

7.       Force Main