Croatia is mountainous. Walk 100 steps and be safe even during a Tsunami.
You can't compare a rising ocean in low lands with "rain". Even a monsun rain will outperform your mediterranean rain by 10x.
Not even trying to. However, rain can be surprising...
Anyway, my city has more rainy days during the year and more total rain than world-famous benchmark - London.
We enjoy around 1500 l/m2/year, however, sometimes it can fall 150-250 l/m2 in a FEW HOURS. This means two months of rain in a matter of few hours.
That's when pictures like above can be taken.
I am just now looking at the climate of India, and I see that the average is 750-1500 l/m2/year with extremes being eastern delta of Ganges (1500-2000) and western part (2000-3000).
2000 is the rainiest part of Croatia.
So, total shows that my city is close to highest Indian average, meaning that old Europe has a few tricks up its sleeve.
You are right, coastal part of the country has a lot of mountains, for example I work in the city center a hundred meters from the shore, my home is 12 kms away at an altitude of 400 m.
Just a few kms more than that and you are at 800 m altitude.
p.s. Dhaka, Bangladesh, up to 5000 l/m2/year. INSANE!
Did I forget to mention that I hate rain?