By Steve Setzer & John Carron (AMEC Earth and Environmental)

Abstract: AMEC enhanced the RiverWare model of the Milk - St. Mary River System, previously developed by the Montana Department of Natural Resources and Conservation, to incorporate the use of an annual balancing period to determine the operation of the St. Mary Canal. This allows the United States to build a credit, based on over delivery to Canada early in the runoff season, that can be drawn upon later in the year during irrigation season.