Melt butter in a sauce pan. Stir in flour to form a paste. Add white sugar, brown sugar and water; bring to a boil. Reduce heat, and simmer 5 minutes.
Place the bottom crust in the pan. Fill with apples, mounded slightly. Cover with a lattice work of crust. Gently pour the sugar and butter liquid over the crust. Pour slowly so that it does not run off.
Bake 15 minutes at 425º F. Reduce the temperature to 350º F and continue baking for 35-40 minutes.