We got the call on this water Feature, it a koi pond with vertical waterfalls. The problem is it leaks. There are way to many drop offs and water is just splashing out of the river on the way down. Problem 2 is water also leaks under the waterfalls made from concrete, it causes the pond to bubble up and flow out and over. We found this picture on the internet ( I’m not claiming this is mine ) I just like the idea and I will be rebuilding this one.

Not my photo, just our inspiration. Will follow up with project photos.