how big of an area are you thinking of levying off? make sure that you have the amount of water in your holding pond figured pretty close. amounts of water do not go nearly as far as people think when you start flooding an area. and as far as where are they going to go....they are going to wherever they need to in order to eat. adding millet will also add to your current variety of ducks. describing what you are, would broadcasting jap millet on the mud flats as the pond dries each summer work?