I am interested in this answer too! I have a pond, pump, and a larger water tob. Nice thing is the tub has a drain, and i saw someone fashioned a sink drain in the bottom of a wading pool....he pulls the plug and rinses it in place, done!
I plan to have mine on the dog side of the fence, which will limit duck/goose access. I also want to make a filter system, like red volcanic rock in a half wine barrel....,creating a three tier waterfall effect. All this will be set up next to my new "art studio" shed we just put in.
Be careful with ponds and poop. You'll have to experiment and be ready to set up an actual filter before it reaches the pump.
I have a half home-made, half store-bought pond type thing inside of a giant 200-gallon terrarium. (
757.08 Litres for those across the pond.) The terrarium has turtles, lizards, and frogs. The turtles are known to get in the water to poop, but are otherwise land turtles. However, their poop, and the sphagnum moss I use for bedding in the rest of the terrarium, can EASILY clog the pump. Some of it gets inside the pump and wraps around the propeller piece that moves the water. Other pieces get caught in the slits in the plastic pump housing where water gets drawn in. But it gets clogged up fast between the poop and dirt, and just stops working.
Maybe a much bigger pump would work, because it would have the power to handle the gunk that comes in. I don't know. But I do know one of the first thing waterfowl does when they get in water, is poop. It might also help to have a large enough pond that the poop can't build up as fast. If I took the piece between the pump and "pond" out and let turtles climb on top of the pump itself, their little pond could only hold three turtles at the same time. No more would fit. Period. So maybe if you had a pond large enough to hold all of your geese and then have plenty of extra space, the pump wouldn't run the risk of getting clogged.
But all of this is something you should definitely look into before you build one. Other things worth considering, is how much vegetation you plan to have in the pond, and how much of THAT may occasionally get into the pump, or maybe even exactly where the pump would be situated. A pump drawing from the surface is less likely to get gunk in it, because the extra pieces would sink to the bottom before getting into the pump at all. But if you have the "overflow" type of draining, you have to worry about floating things, like wood, getting down in there.
I do think it's possible. But it's going to take a lot of research, especially into actual filtration systems.