In a Dutch oven, bring water to boil. Add the broccoli, celery and carrots; boil 2-3 minutes or until crisp-tender. Drain; set vegetables aside.
In the same pot, saute onion in butter until tender. Stir in flour to form a smooth paste. Gradually stir in broth and milk until smooth. Bring to a boil; cook and stir for 1 minute or until thickened.
Stir in reserved vegetables and remaining ingredients. Reduce heat; cook, stirring occasionally, for 15 minutes or until vegetables are tender.