HEC-RAS 6.0 “Run RAS-Modflow coupled model”

[benp]

My question in short version: there is “Run RAS-Modflow coupled model” in the Run model.
Question 1:Is it possible to use it or it is for futur version?

Long version:
I try to model a 2.25 km² dry valley (valley with no river except during flood: the bottom of the valley is gravel from a glacier).
For this, I import: historical precipitation, geotiff for terrain and geology vector shapefile for SCS curve number.
I filled the SCS curve number table: layer 12 (right bottom) is high permeability, the rest is low permeability.

Here is the infiltration map after precipitation:

The problem is that the water which start to runoff doesn’t infiltrate in the high permeability layer(runoff water never infiltrate in hec-ras). This is not the case in the reality.
Question 2: Is there a workaround for this or I must wait a next HEC-RAS version?

I tried to use Groundwater interflow with the parameter: Groundwater stage=217m (all the time), Groundwater interflow=1m/day and Thickness=10 m(I didn’t understand that one), Initial level=217m, reservoir bottom=216.5m
The result is (part of the graph with no precipitation:

The reservoir level should stay at 217m but it is empty in half a day (1m/day).
Question 3: Didn’t I understand somethink or is this a bug?

[benp]

My last post was for 6.0.0 beta 2.
With 6.0.0 Beta3, the menu is still greyed (in “Run /Run RAS-Modflow coupled model”)

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