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Anyone know why I am getting the following (attached) rpt file containing ERROR 173,  for the attached input file?


ERROR 173: Time Series TSS1 has its data out of sequence at JAN-01-2010 00:45:30.

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2 Replies · Reply by Upaka Mar 8, 2011

Uncertainty Analysis

Hello everybody

I want to examine uncertainty of rainfall duration with the monte carlo method. So I should link SWMM with MATLAB program and run the program many times (here 1000 times). In each iteration I should change the duration of rainfall and

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6 Replies · Reply by fang Mar 17, 2012

Variable for orifice height


I want to include a variable to the orifice height of my network and I tried to implement this through the source codes of SWMM 5.0. I am looking a particular function to do this. 

Please look at the following example.


Manning´s roughness coefficie

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4 Replies · Reply by Upaka Oct 6, 2011

Usage of control rules


This is about the control rules.

I am trying to simulate a network with the help of control rules.

Total simulation period is 2 hrs and 30 minutes, however, I'm running the simulation part by part. Eg 0 to 15 minutes, 15 to 30 minutes, 30 to 45 minu

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2 Replies · Reply by Upaka Oct 10, 2011

Negative flow problem


I am currently using SWMM 5 to model the Upper Bukit Timah catchment in Singapore for my master thesis. I have already tested several events of precipitation to model the flow on the outfall node. The results were reasonable, the modeled flow was

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2 Replies · Reply by Emilie May 12, 2011

Time of concentration

Hi everybody.

I want to know how SWMM cosider time of concetration & lag time.

I think that SWMM calculate the peak of runoff for each subcatchment & the total runoff is the algebric sum of each subcatchment not the sum of hydrographs.

Is it correct?


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