Country Roast And Vegetables

1 roast, thawed
4-5 potatoes, peeled and sliced
4-5 carrots
1 can whole kernel corn
1 can green beans
1 onion, sliced
1 c. water
1/4 tsp. salt
1/4 tsp. pepper
3 tbsp. margarine
1/4 c. flour

Place roast in crockpot. Add peeled carrots, onion and margarine. Add water and flour to make gravy. Sprinkle with salt and pepper. Cook on high 5-6 hours. Add corn and green beans about one hour before roast is done.