water pump

So I have a 4'x4'x37" pool I plan on using for some smaller ornamental duck species but if it is possible I'd like to build a pond. I could do a full on drain with the plumbing and all but I have lots going on and don't know if I want to take that on as another project. I heard about someone...

I have an old sheep stock tank (60-75 gallon capacity, I can't remember which) that I have used as a swim tank for my ducks outside. I live in Montana, where it is pretty dry, but I have an irrigation ditch nearby that I pump water out of to fill the tank for them. I have a drain valve at the...