Posted: 18/03/2015 at 17:58
I assume that the pond is one made with a liner. If so once it is empty of wildlife you can rip it up and dispose of it. Or if you want a bog garden, leave it in place and puncture it with a garden fork all over. If it is a preformed pond, then it will have to be dug out . How big is the pond? If you are thinking of turning it in to a raised bed, does that mean it is above ground? If it is only a little pond, you could have a go at catching the tadpoles and relocating them somewhere else. Not PC of course but better than dumping them on the compost heap or in the bin. There may be fish in the pond. They will only come to light in the next month when they start to move around or if you try to empty the pond sooner. These will pose more of a problem in disposal. At lease the frogs will eventually leave of their own accord.
And while you are thinking this through, and if you have young children, a temporary fence round it needs to be erected. Or a grille depending on size.