Calibration

I only want to analyze the stormwater runoff reduction with LID, so in my case there is no any grey infrastructure. I used real rainfall and climate data for rain gage and climatology files, so I'm a little bit confused which kind of data I should put in the calibration files and how the format is.   

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  • The EPA SWMM 5 calibration file is only for comparing the following 12 internal variables graphically to either SWMM 4 results, monitored data or some other model results:
    1. epa_swmm_calibration_files-large.jpg
    1. Subcatchment Runoff
    2. Subcatchment Washoff
    3. Node Water Depth
    4. Link Flow Rate
    5. Node Water Quality
    6. Node Lateral Inflow
    7. Node Flooding
    8. Groundwater Flow
    9. Groundwater Elevation
    10. Snow Pack Depth
    11. Link Flow Depth
    12. Link Flow Velocity

    3293134509?profile=original

    The graph on your SWMM 5 screen can be saved either to the clipboard or an external file for further manipulation of the computed and observed (calibration file data) by using the commands

    Edit->Copy To=>Clipboard=>Text or

    Edit->Copy To=>File=>Text

    Just remember that the computed variable value comes first in the text followed by the observed variable value. For example:

    Link 1030 Flow
    Series Elapsed Time (hours) Flow CFS
    Computed 0.1667 0.0000
    .
    .
    Observed 0.0167 0.0000
    • Hey! But I have another question. The watershed I delineated is not the location where the stream data was collected and it's far away from the watershed I selected. In this case, can I still use these stream data for calibration or should I use other data?

  • Well in your case they should be the same as the units of your SWMM 5 model or the flow units at the bottom of the SWMM 5 interface,  flow is in cms and depth is in meters, so if you are using lateral flow then you should use a calibration file with flow.

    3293141676?profile=original

  • Here is a example of the format for a flow calibration file

    I would suggest a Node Lateral Flow Calibration File as you do not have any links.

    ; OUTFALL to STORAGE Depth Calibration File exported from SWMM 5
    4
    01/01/2011 1 : 0:00 0.0000
    01/01/2011 2 : 0:00 0.0148
    01/01/2011 3 : 0:00 0.0136
    01/01/2011 4 : 0:00 0.0126
    01/01/2011 5 : 0:00 0.0117
    01/01/2011 6 : 0:00 0.0109
    01/01/2011 7 : 0:00 0.0102
    01/01/2011 8 : 0:00 0.0095
    01/01/2011 9 : 0:00 0.0090
    01/01/2011 10: 0:00 0.0084
    01/01/2011 11: 0:00 0.0080
    01/01/2011 12: 0:00 0.0076
    01/01/2011 13: 0:00 0.0072
    01/01/2011 14: 0:00 0.0068
    01/01/2011 15: 0:00 0.0065
    01/01/2011 16: 0:00 0.0062

    • Hey! Thanks for your quick reply! But I don't get what these values are. I mean 0.0148, 0.0136, 0.0126 etc. Are they stream data and what is the unit of it?

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