I thought that you were making a fish pond. Gee! It was too close what I was hoping to bring it up. I see that it's for draining the water. It looks a good idea. How deep it is? Does it have underground water?
I think that it is a great idea for people who have a horse farm. I have seen many horse farms that have a lot of mud in the spring time.
Actually, I have some water that comes in my basement in the winter once a while. It was a nightmare for me ...the flood was two inches half way in the basement. My backdoor in the basement, the foundation is too low. I have thought about the drainer, but I don't know much about it. I didn't want to end up like 10,000 dollars for this project.
For example, my small back porch (16 ft x 9 ft) has a long crack and the company said that it cost 30,000 dollars to replace the whole cement floor. The contractor is probably fraud. Of course, I didn't hire him to do it. I would think that it cost between 2 to 4 thousand dollars which seems proper to me.