Hamburger Crockpot Casserole

I got this recipe from my Parker-Egin cook book. It was submitted by Donna Howard!

2 large potatoes, scrubbed and sliced
2 to 3 medium carrots, sliced
1 10 oz. pkg. frozen peas
2 medium onions sliced (I only used half of an onion)
2 stalks of celery, sliced
1 to 1 1/2 lbs. hamburger, browned and drained
2 cans cream of mushroom soup
1/2 can water
salt and pepper

Place layers of vegetables in order given into crock pot. Season each layer with salt and pepper. Put hamburger on top of celery. Mix soup and water; pour on top. Cover and cook on LOW for 6 - 8 hours or HIGH for 3 - 4 hours, stirring occasionally.