sound of running water
淙 centers on the sound of flowing water, like a stream or brook babbling.
淙 combines 氵 (water) with 宗, which likely contributes the sound ソウ and reinforces the idea of water-related sound.
Water 氵 flows beside a temple 宗, and you hear the gentle sound of running water echoing around the temple grounds.
For ソウ, imagine the soulful sound of water flowing: soul -> ソウ, and the water's voice is a soothing, running murmur.
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murmuring (stream, brook, etc.); gurgling; babbling