pour down, cascade down, look
濩 centers on water moving downward in a forceful or abundant way: pouring down or cascading down. The meaning "look" is a rare, separate sense that does not clearly connect to the water idea.
濩 combines 氵 (water) with 蒦, which likely contributes the sound. The water component fits the pouring/cascading meaning, but the detailed historical development of 蒦 is uncertain.
Water 氵 pours down over the complex right side 蒦, like a waterfall cascading over a rocky cliff face.
For カク, imagine a huge cascade of water crashing down with a loud "kaku" sound as it hits the rocks below: kaku -> カク.
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