Has anyone had any luck with H2S modeling in ICM without rainfall events?

So far I'm loading general WQ parameters into the wastewater/trade flow profiles; high BOD contributors as BOD pollutographs; and oxidant dosing stations as DO pollutographs.

No sedimentation fractions. Oxygen demand as BOD (though I may switch to COD).

Is this the correct way to handle this? I

s there a way to add sulfate concentration to the WQ parameters for the H2S calculation?