I went to the park make sure there are enough water in the main pound so that the duck can float. However, the pound is drying out as the weather gets warm. As an result,there were not much water left in the pound. The duck is quite heavy. Although its got enough air sealed inside its body. The amount of water left in the pound seems not enough.
Even if the duck can floating on the pound it might trapped into the weed around the pound.
As a solution, I walked into the pound using stones built up a stand that can hold duck in certain place where I wanted it to be. wire will be used to attach the duck sculpture with a piece of stone to give enough weight to the duck.