This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
澋 combines 氵 (water) with 景, but the exact historical development is uncertain. It may have originally related to a body of water or a flowing concept, but no clear etymology is established.
With water 氵 and a scene 景, imagine a vast, swirling flood that obscures the landscape, making its meaning unclear.
For コウ, picture a koi fish swimming in the murky water: koi -> コウ, though the water is too cloudy to see clearly.