[trapan13]

Hi everyone.

I have modelised a spillway with interfoam.

I have match my water level numerical result with my physical water level result.

After some time I found the good parameters for my model.

But I have a question.

My physical model is in concrete and is very smooth.
However in my numerical model I have put :

0/nut:
Cs=0.5
Ks=0.1

With these parameters my result are okay.

But How can I explain the value of Ks? In reality my height rugosity is more 0.001m than 0.1m.

Thank you for your help