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Strangest thing. Found them by my office, which is nowhere near a stream.
The mother will set up her nest often quite a long way from water. When they are a few days old she will lead them to the water. She was probably nearby when you found them. Ducks are amazing at finding very secret hiding places for their nests. Is there any chance you could go back and search for the nest? She might still be there with the rest of the brood and you can try and put them back? Mother ducks cannot count! If she is long gone, then advice from your local animal rescue is a good idea. There might be legal restrictions on you keeping them.
If you do end up raising them, then you should remember that they are wild ducks, and they will not really settle down to domestic life like a domesticated duck breed will. They will naturally be much more afraid of humans and difficult to tame, and harbour a "wanderlust" and you should allow them to fly off when they are ready. They will need to be with their own kind, to breed, or migrate or whatever they naturally do. You never know, they might come back to visit! Just my thoughts and I write from experience!