Pond waterfalls add a wonderful features to your backyard habitat. They sparkle as water rushes over the spillway (wier), and they sing a relaxing sound that seems to soothe the human soul.
Churning water discourages mosquitos, which breed in still and stagnant pools. The pounding and surging water also adds oxygen to the water benefitting the inhabitants.
Fortunately there are all kinds of cleverly designed pond waterfall units that are lightwwight and easy to disguise. Many include the filter right inside the waterfall containment chamber, accomplishing two jobs in one. Add a UV clarifier to keep the water algae-free and crystal clear. Add lights for night-time pleasure. Add yet another fillter-less unit adn get two layers of falls. The possibilities are endless.