DISSOLVED OXYGEN CALIBRATION

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Mario Fomaca Jr

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Oct 1, 2025, 11:59:56 AM (11 days ago) Oct 1

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Hello everyone,
I've successfully calibrated monthly streamflow and sediment, and I'm now working on calibrating dissolved oxygen (DO). However, when I apply the sediment parameters — v__usle_p.hru, r__usle_k.sol, v__prf.bsn, v__cov.rte, v__cherod.rte, v__spcon.bsn, v__spexp.bsn, v__adj_pkr.bsn, and v__lat_sed.hru — my DO drops to zero in all simulations (I'm using SWAT+ CUP).

Has anyone had experience calibrating DO in SWAT+ and could share some tips?
I've been trying to adjust the following DO-related parameters: rch_dox.swq, rch_cbod.swq, rk1.swq, and rk2.swq, but so far without success.

I came across an old SWAT+ document (2016) that mentions a parameter called SUBWQ, related to DO, located in the codes.bsn file. However, this parameter doesn't seem to exist in the current version I'm using (SWAT+ rev.61.0.1).

Thank you!

Mario

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