water-curtain

Water curtain is common design cludge a flat/thin object representing a waterfall. It looks entirely unrealistic and doesn't resemble actual water movement, rather its a cheap animated texture. Anyone who watched a video of a waterfall or experienced it IRL will not find it immersive.
Similar flaws representing flow in rivers as "wave texture" is a horizontal Water Curtain.
Modern graphics can afford accurate water representation without physical simulation of water.