Mama To Three Chicks: Kiddie Pool Cover - looks easy! I'm thinking to use it as a sandbox cover (made using a kiddie pool similar to this one) To make one that is waterproof, you could start with a really big round vinyl tablecloth.
Idea for keeping water clean for ducks /chickens by mounting a 'kitchen sink drain" in a pool or other water container. ELEVATING off the ground so it can drain not create a muddy area around the water.
Upcycle that old kiddie pool! "Raised Bed Garden" from a kiddie pool! Should've thought of this before getting rid of it. Would also make a fun Kid Garden for kids to dig in & plant flowers! I almost threw this away today