Thierry

you will find the pdf. 

Hi,

normally you can check that the volume incoming from infiltration in the model is right according to the calculation you could don with the surface.

No, I wanted to be sure that you have not fixed all the boudaries, it could be difficult in this case !

Normaly, if you check the balance I think you should note significant change in the volume if you change only the recharge (10 to 20 times more).

Perhaps a stupid question : Have you checked all your layers to verify that there is not too high values (by mistake ).

Another stupid thing to check : Have you checked that your coordinates are in meters and not put in kilometers.  I mean that for example if you work on a  10x5 km area and you put 10 and 5 as coordinates in the model, the model "thinks" that it is 10 to 5 meters and not km.  (I did that one time, many years ago, and it took us 3 days to find it).

I suppose that you are in the calibration phase of your model, how many days you use for the run?

Have you set on all boundaries of your  model boundary conditions (head fixed) ?

to be sure : you have model only one geological layer?

Have you checked tthe balance when you have changed the recharge?

Right ! What are your value for recharge?  are in steady state or transient flow?  In this case, how many time are you running?

Perhaps you could explain a little bit more of the configuration of your model, boudary conditions...?

Hi,

But what do you mean in your post by rainfall then?

Groundwater recharge is in the flow material menu, In(+)/out(-)flow on top for layer 1.

regards

Hum ! :-\  I think it could be due to some think. Have you checked that your infiltration value is correct and not too low?

And if the hydraulic conductivity is high, it could be difficult too.

Perhaps could you give us more explanations on values you are using ?

regards

In a previous discussion in october 2006 on Pest, Peter (Schätzl) writed that"...  Currently we're developing a pilot point interface, too. "

I want to know if this interface is yet available or not ?


Best regards

in addition :

perhaps your convergence problem was due to others factors than dry cells? you find some questions hereafter to check some aspects of your model!

You said : "layer2 is impermeable and not a confined aquifer. I have assigned it fixed because after a fixed slice there is always a confined aquifer, that is layer3. "

If I understand correctly you assigned "fixed" to slice 2 (slice between layer 1 and layer 2)?

I was suprised that the water level of your aquifer 2 was below the water level of aquifer 1.  sometimes, It's difficult to understand thinks without maps !
The aquifer 2 is has an output under the sea? is there pumping ?
How do you put the boudary conditions?

are you running in steady state or transient flow?


Have a nice day

Quick answer
If the piezometric level is always upper than the top of the layer 3 (in your model) for me layer 3 is to be considered as confined.

The result on your layer 1 is partly available for your aquifer 1and for your aquifer 2.  Where your aquifer 2 is outcroping, you have normally few differences between results from layer 1, 2 and 3.  I think you could notice that at the change of your parameters in layer 1 (transition zone between aquifer 1- impermeable formation-aquifer 2) that you have some problems but it depends of the conductivity values.