Transfer coefficients for head dependant flux boundaries ...

???

Dear Feflowers,
I am trying to model a serie of rivers/quebradas by using the Transfer (3rd type) boundary condition in Feflow.  I am not too sure about the values to apply for the transfer coefficient (which I think corresponds to what is called the stream conductance in MODFLOW world).
I suspect the value of this parameter depends on outcrop/riverbed geology and alluvium/sediments thickness which may decrease the connectivity between aquifer/river.
Would anyone have an example of values applied from past experiences for the transfer rate (IN/OUT) ?
For info, the rivers of my site lay on both sedimentary and igneous rocks. 
All suggestions welcomed ... thanks.

Loic

I think Transfer rate is a similar concept to Conductance in Modflow.
Transfere rate is K/d where d in river condiction must be the river bed  thickness. then  you will have a value in [1/d]. Sortware use the element geometry to calculate conductance (m2/d).

I saw an example where they use a value of 500 [10e-4 1/d].