roar
漰 centers on a loud, rushing sound like water roaring or crashing. The single given meaning 'roar' is tied to the forceful movement of water.
漰 combines 氵 (water) with 崩, which likely contributes the sound and the idea of something collapsing or crashing down, suggesting the roar of rushing water.
Water 氵 crashing down like a collapsing mountain 崩 creates a deafening roar.
For ホウ, imagine the roar of water echoing through a hollow canyon: hollow -> ホウ, and the sound fills the space.
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