In a small bowl, combine 1/2 cup water, ketchup, brown sugar, Worcestershire sauce, paprika and mustard; pour over meat.
Cover and cook on low for 5 hours or until meat is tender.
Combine the flour and remaining 1/2 cup water until smooth; stir into meat mixture. Cook 30 minutes longer or until thickened.
Meanwhile, cook noodles according to package directions; drain. Serve with beef.