I'm in the process of digging a pond!!! Great fun. It'll be roughy 100'x100', with a peninsula and natural looking edges. I'm going for 25-30% of the area to be planted with cat tails, lilies etc. There will be no liner or pump or fountain. The primary purposes of the pond is wildlife resource and humans swimming. For the aquatic planted areas, should I make slopes or shelves? Originally I thought shelves and now I'm thinking gentle/gradual slopes might be the way to go. Slopes would allow the plants to migrate to where they are best suited. Thoughts? And what's a great pond book out there?Thank you!