Supporting time varying streambed hydraulic conductivity in SFR

[ougx]

Is it possible to simulate time-varying SFR conductance in MF6? I don't see there is an option in the documentation. I noticed this PR #768 but it doesn't seem to apply to SFR.

[emorway-usgs]

I'm wondering if you meant time varying streambed hydraulic conductivity (parameter name rhk in SFR)? Conductance will vary as wetted streambed area changes if you're using the n-point x-section option, for example. Currently there is not support for varying rhk through time.

Depending on @langevin-usgs's thoughts, perhaps this feature request could be added to the Requested Features list on the wiki.

[ougx]

Thanks, @emorway-usgs. That's correct. We want to apply a time varying multiplier factor to the conductance like in MF 5's Condfact parameter. I am thinking some kind of AUXMULTNAME option. Or add the option of sfrsetting for rhk, rbth or rwid or rlen.

[langevin-usgs]

When we first wrote the SFR Package in MODFLOW 6 we tried to limit the number of adjustable parameters, especially related to how a stream network might change over time. There is the option to activate and deactivate reaches, so you can do what you want now, but it would require a complex turning on and off of reaches with different rhk values. Recognizing that this may not be the best approach for gradual changes to rhk, I think we could consider adding support for time-varying rhk in a future release. We are in the process of implementing a new "input data model" approach for reading the advanced packages, such as SFR, so I think waiting until after that is completed would make most sense.

[langevin-usgs]

BEDK is now supported as a sfrsetting. Close with #1747.