SWMM rainfall data

Replies

Robert Dickinson July 27, 2013 at 2:22pm

That means for each year event, I will need to creat a separate file. Say for 1y1h,1y24h,then 100y1h......can I ignore the gauge station ID and date, just input as
05 1.25
10 1.3
15 1.35

No, you cannot ignore the ID but just call it 100yr, 10yr etc for each file, yes you need a different file for each return period but you can also make a time series of rainfall and use the time series with the Rain Gage
Robert Dickinson July 27, 2013 at 1:55pm

Here is an example of the format for a SWMM 5 User Defined Input file, it is at one hour intervals

Here is an example at 5 minute intervals

088824 1970 1 1 20 5 0.010
088824 1970 1 1 21 10 0.048

088824 1970 1 1 20 0 0.010
088824 1970 1 1 21 0 0.048
088824 1970 1 1 22 0 0.029
088824 1970 1 2 7 0 0.010
088824 1970 1 2 16 0 0.009
088824 1970 1 2 17 0 0.194
088824 1970 1 2 18 0 0.047
088824 1970 1 2 19 0 0.029
088824 1970 1 3 1 0 0.047
088824 1970 1 3 2 0 0.142

You can model the ditch retention using a trapezoid or open channel, another idea would be a LID for the LID with the Ditch a Swale

Steps are to make the User Defined File for SWMM 5, Make a Rain Gage Object, use the file you just created and then use 0:05 as the interval.
- Echo > Robert Dickinson July 27, 2013 at 2:07pm
  
  Thanks a lot for your quick response. That means for each year event, I will need to creat a separate file. Say for 1y1h,1y24h,then 100y1h......can I ignore the gauge station ID and date, just input as
  05 1.25
  10 1.3
  15 1.35
  .
  .
  .
  For 5min interval.
  
  The ditch will be defined in the conduit, using trapezoid shape and set the slope at 0.001? Will it work?