> Opps. I sent you the wrong file. Pl. use this. There's 3x times the Cl- in B. I don't think you can dissolve that much halite. Looks to me like the evaporation factor should be larger, about 8 L goes to 1 L. To model this you need to remove the halite, but add balances on Na and Cl. I also doubt that biotite dissolves or precipitates. If you remove halite and biotite, you can probably ignore the potassium, but you'll need a sink for Mg. For starters, I might guess that it is taken up with calcium into calcite. You can model this by adding magnesite and just combine the calcite and magnesite in your head as a magnesian calcite. > Do you have any suggestions about how I can control the water balance during baseflow (&very low evap) months ? I'm attaching an example. There is much more measured flow at B (10x)than at A due to contribution of lateral&baseflow. Perhaps, there are other sub-routines/keywords in phreeqc that I could use ? You need a composition for the ground water that is discharging to the stream. Then you can mix the stream with the ground water to make the final stream water. INVERSE_MODELING allows multiple initial solutions that mix together simply by adding another solution number on the -solutions line. The last solution number is the final water. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 Project web page: https://wwwbrr.cr.usgs.gov/projects/GWC_coupled
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