Hi all! I currently have a large kiddie pool for my ducks in the back of the run they share with a handful of chickens and peafowl.. it's one of those $10 blue ones you'd find at Walmart.. pic below

We're doing a lot of landscaping around our coop and I've been thinking about buying a preformed pond liner to dig into the ground .. something like this:

I want to give my ducks something bigger to swim in but I'm a little bit concerned about the chickens and/or peafowl accidentally falling in and drowning. The deepest point of this liner is 18"...
Has anyone ever used one of these with a mixed flock?
We're doing a lot of landscaping around our coop and I've been thinking about buying a preformed pond liner to dig into the ground .. something like this:
I want to give my ducks something bigger to swim in but I'm a little bit concerned about the chickens and/or peafowl accidentally falling in and drowning. The deepest point of this liner is 18"...
Has anyone ever used one of these with a mixed flock?