Subject: Steady State Flow Analysis in InfoSWMM using an External Flow Time Series
This can be easily created using a few steps in InfoSWMM. The flow ramp is in the Routing Interface File. The advantage is that you are able to have different ramps for the various nodes using this method.
Step 1: In Run Manager Set up the Process Models Options to use just the External Inflow and NOT the Dry Weather Flow
Step 2. Create the External Inflows File (see the help file for the format)
SWMM5 Interface File
300 - reporting time step in sec
1 - number of constituents as listed below:
FLOW CFS
2 - number of nodes as listed below:
36
24
Node Year Mon Day Hr Min Sec FLOW
36 2002 01 01 00 00 00 0.000000
24 2002 01 01 00 00 00 0.000000
36 2002 01 01 01 00 00 1000.000000
24 2002 01 01 01 00 00 1000.000000
36 2002 01 02 01 00 00 1000.000000
24 2002 01 02 01 00 00 1000.000000
This file loads two manholes with a ramped inflow up to 1000 cfs to again drown out the wet wells and cause the pumps to have a steady flow.
Step 3. Use the Tab File command and use the created External Inflows File
Step 4. Run the simulation and see if the pump flows are constant.
