I haven't seen that many waterfalls in Slovenia but of the ones I have seen there is only one with a respectable volume: slap Boka.

I don't think Slovenia is a country with tremendous powerful waterfalls. I have seen pictures of slap Govic erupting with so many water, that is unbelievable. Unfortunately it is very rare that you can see this waterfall (after a long periode with heavy rain).

Nevertheless I made a top 10 of powerful waterfalls in Slovenia. Enjoy my list "top 10 biggest waterfalls of Slovenia"

Slap Boka is the mightiest and most impressive waterfall in Slovenia (certainly in springtime) with a significant volume. The waterfall has a consistent flow (avg 2m3/sec), but gets very powerful after heavy rainfall or in spring when snow is melting down the mountains.