WASHINGTON – The muddle between the U.S. Environmental Protection Agency and the Army Corps of Engineers on what constitutes “navigable waters” under the law has been settled. A new agreement creates a mutual regulatory definition both to protect people’s health and to support the interests of farmers, ranchers and landowners. The definition revises the 1972 Clean Water Act. The goal: A consistent understanding between  federal agencies on policy on U.S. waters  including the Upper Mississippi.