Artificial Lake

I have a client that is interested in building an artificial swimming lake in a new subdivision. It would be close to a natural lake (that isn't good for swimming in this area) and wetland and the groundwater is high. This is out of my expertise but I was hoping for some feedback on general considerations that I could raise with them. Such as what specialists would need to be involved, studies that should be conducted, and generally what the system might be required (pumps, filtration, liners, aeration). Thanks a lot.