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User prepared climate file for evaporation calculation

Posted by Uda Pannizzo on March 22, 2016 at 1:21pm in SWMM5

Dear all,

I'd like SWMM to calculate Evaporation.  I've to prepared a user prepared text file with the information listed in the manual (section "climate files"). The text file, spaced delimited, looks like:

Antwp 1998 1 1 7 5        

(Station ID, Year, month, day, max temp, min temp) 

 When i try to run a simulation I get the error 339, meaning that SWMM doesn't recognize the file.

- Is there anyone who can give me an example of a properly working User prepared climate file?

Furthermore, i've another question. As far as i know, the Hargreaves model is implemented in SWMM. This model requires the latitude of the place. I don't find any field in SWMM where i can input this info 

-Can you tell me where the information of the place latitude should be introduced?

Many thanks in advance

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Tags: climate file, evaporation
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Replies

  • Robert Dickinson March 23, 2016 at 3:43am

    The latitiude is entered in the snow melt tab of the climate editor.

          case 3: // Snowmelt params

            if ( ntoks < 7 ) return error_setInpError(ERR_ITEMS, "");

            for (i=1; i<7; i++)

            {

                if ( !getDouble(tok[i], &x[i-1]) )

                    return error_setInpError(ERR_NUMBER, tok[i]);

            }

            // --- convert deg. C to deg. F for snowfall temperature

            if ( UnitSystem == SI ) x[0] = 9./5.*x[0] + 32.0;

            Snow.snotmp = x[0];

            Snow.tipm   = x[1];

            Snow.rnm    = x[2];

            Temp.elev   = x[3] / UCF(LENGTH);

            Temp.anglat = x[4];

            Temp.dtlong = x[5] / 60.0;

            break;       case 3: // Snowmelt params

            if ( ntoks < 7 ) return error_setInpError(ERR_ITEMS, "");

            for (i=1; i<7; i++)

            {

                if ( !getDouble(tok[i], &x[i-1]) )

                    return error_setInpError(ERR_NUMBER, tok[i]);

            }

            // --- convert deg. C to deg. F for snowfall temperature

            if ( UnitSystem == SI ) x[0] = 9./5.*x[0] + 32.0;

            Snow.snotmp = x[0];

            Snow.tipm   = x[1];

            Snow.rnm    = x[2];

            Temp.elev   = x[3] / UCF(LENGTH);

            Temp.anglat = x[4];

            Temp.dtlong = x[5] / 60.0;

            break;

          case 3: // Snowmelt params        if ( ntoks < 7 ) return error_setInpError(ERR_ITEMS, "");        for (i=1; i<7; i++)        {            if ( !getDouble(tok[i], &x[i-1]) )                return error_setInpError(ERR_NUMBER, tok[i]);        }        // --- convert deg. C to deg. F for snowfall temperature        if ( UnitSystem == SI ) x[0] = 9./5.*x[0] + 32.0;        Snow.snotmp = x[0];        Snow.tipm   = x[1];        Snow.rnm    = x[2];        Temp.elev   = x[3] / UCF(LENGTH);        Temp.anglat = x[4];        Temp.dtlong = x[5] / 60.0;        break;

    • Uda Pannizzo > Robert Dickinson March 23, 2016 at 10:15am

      Dear Robert,

      Thanks for your quick answer.

      So for the calculation of the evaporation, i'll have to fill the latitude in the Snow melt tab

      Concerning the  user prepared climate file?

      many thanks

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