valley river, 10**36
澗 centers on a valley river, a stream flowing through a gorge. The large-number sense (10**36) is a rare, specialized usage unrelated to the water meaning.
澗 combines 氵 (water) with 間, which likely contributes the sound and the idea of a space between, suggesting a river running through a valley or gorge.
Water 氵 flows through the space 間 between mountains, creating a valley river.
For カン, imagine a can floating down the valley river: can -> カン, and the water carries it through the gorge.