r.impact.tsunami : runup calculations (step5)

[sljyad]

I don't really well understand the way runup calculations is made. It could be correct, but in my study case I have a fully NULL inundation map, which is quite strange given the 90 m wave.
As it is written now, dry zones (coastal) as not considered to be subject to runup ("zones" definition), which seems quite strange to me...
The criteria to define "runup propagation zone" include wave break condition, why ?
Also the "runup line" is in my case in the wet area (lake), whereas I was expecting it to be on the coastal area.
It is possible I just am mistaken, could you clarify those points for me ?

• what "runup propagation zone" means exactly ?
• what "runup line" means exactly ?
• is it normal to have a full NULL inundation map ?