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Diversion Baffle Case History

February 27, 2018

Location: City of Boise, Dixie Drain Phosphorous Removal Facility

Project Overview: the City of Boise and Brown & Caldwell designed a model facility in watershed-based approaches for meeting total maximum daily load limits treating 130 million gallons of daily water by removing phosphorous before entering the Boise River. It is a model for regions facing nutrient removal challenges with budget constraints.

With ABASCO baffles incorporated in the lagoon separation phase and some additional containment requirements, the City of Boise and Brown & Caldwell received the Grand Award by the American Council of Engineering Companies (ACEC) for engineering accomplishments and several regional ACEC awards for the recent project.

 

ABASCO Contribution: Product design, manufacture & installation support

  • Custom designed flow around baffles
  • Furling lines included for dredge maintenance
  • Additional ballast design incorporated to meet high wind projections
  • Provided custom rigging with winches for line tension and easy maintenance
  • ABASCO Senior Technician supervised the final installation with assigned contractors

Project Challenges and Features –

  • Custom designed lagoon baffle for phosphorous reduction from Lower Boise River Watershed
  • Strong wind projections required extra anchoring and ballast options to meet design specifications
  • Curtains were designed to facilitate routine dredging maintenance schedule
  • Cost effective process design demonstrates benefits of lagoon baffles for reduced capital budgets