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Total Precipitation does not match sum of precipitation in input file

Posted by Laura Ruppert on December 15, 2011 at 4:39pm

The total precipitation in inches reported in the EPA SWMM Status Report (9.075-in) does not match the sum of precipitation data in my input file (15-minute time steps).  The starting and ending dates match, and continuity error is < 1%.  Any ideas about what could be wrong?

 

Thanks, Laura 

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Replies

  • Laura Ruppert December 19, 2011 at 2:57pm

    I made a units mistake (how emabarrassing).  The sum of the 15-min precipitation input (inch/hour) needed to be devided by four.

    Thanks for your help.

  • Robert Dickinson December 17, 2011 at 7:43am

    Here is the one Subcatchment Model

  • Robert Dickinson December 17, 2011 at 7:42am

    Hi, 

    Here is a small mode that uses your rainfall.   I have checked the values in Excel and they add up to the same values as SWMM 5.  You have 1+ year of rainfall, 15 minute intervals and intensity.

    3293150807?profile=RESIZE_1024x1024

  • Laura Ruppert December 15, 2011 at 7:17pm

    Precip Data is attached.  I got the data from King County, WA as a .csv file.  I modified it to put data in the correct columns and then saved as a tab delimited .txt file for SWMM to read.

  • Robert Dickinson December 15, 2011 at 4:41pm

    Do you have a copy of the precipitation data?

    Normally, i would say that the length of simulation is less than the rainfall record or there is missing data with a flag in your rainfall data.

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