Monthly Precipitation with daily timestep

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Ashley R

• March 13, 2024 17:25

Hello, i have set up a simple test model as i continue my training.  I entered precipitation in units of mm/month.  I then calculate runoff and look at the accumulation in a basin (no outflow yet). The runoff (Basin01_Runoff) is calculating correctly but when i look at the daily flow accumulated in Basin01 per month, it does not equal the same value as if i were to just solve it with a simple equation.  For example the basin_inflow rate for January is 632.1 m3/month.  I can calculate the day 1  volume to be (632.1/31)*1d=20.39m3 but the value in Goldsim shows 20.77 m3.  Is there an easy explanation for this?  There are no unscheduled updates. 

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  Rick Kossik

  • March 13, 2024 17:38

  You should generally never use a unit that involves mon.  All units in GoldSim have a fixed definition.  The unit mon is equal to 30.4375 days (an average month).  The definition cannot change during the simulation. This is explained in this part of the Help system: https://help.goldsim.com/#!Modules/5/understandingunitsformonthandyear.htm

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  Ashley R

  • March 13, 2024 17:47

  thank you! i knew i was missing something.  i just couldnt find it.

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