Going by all the above, I can only surmise that "σηκώνει πολύ νερό"means:
is awash, brimming, bursting, overflowing..."with a range" of possible meanings and interpretations
I thought this thread was done and dusted.
I would have said "a sea of" (or even "an ocean of" instead of "a range of") possible meanings and interpretation, in keeping with the theme of "water."
But let's not plunge into a sea of discussion over this. The sea holds a lot of murky water, that's all we need to know.
a sea of something ....
phrase. DEFINITIONS1. a large amount of something. She looked out over a sea of smiling faces. The crowd stood under a sea of brightly coloured umbrellas.