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River Basin Export Reduction Optimization Support Tool; a tool to screen options for reducing nutrient loads while

C Chamberlin1, M Ten Brink2, K Munson3

  • 1Oak Ridge Institute for Science and Education, U.S. Environmental Protection Agency, Narragansett, Rhode Island, USA.

Journal of the American Water Resources Association
|August 4, 2023
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Summary
This summary is machine-generated.

Reducing river pollution from large basins is challenging. A new tool, RBEROST, identifies cost-effective management practices to decrease nitrogen and phosphorus loading, aiding watershed planning.

Keywords:
best management practices (BMPs)modelingnonpoint source pollutionnutrientsoptimizationpoint source pollutionrivers/streamsuncertainty analysiswater qualitywatersheds

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Area of Science:

  • Environmental Science
  • Water Resource Management
  • Ecological Engineering

Background:

  • Excess nitrogen and phosphorus loading harms river ecosystems.
  • Reducing nutrient loads in large river basins is complex and costly.
  • Effective watershed management requires integrated approaches.

Purpose of the Study:

  • To develop a novel tool, the River Basin Export Reduction Optimization Support Tool (RBEROST), for identifying cost-effective nutrient reduction strategies.
  • To demonstrate the application and utility of RBEROST in a real-world case study.
  • To inform watershed planning by optimizing management practices for nutrient load reduction.

Main Methods:

  • Development of the River Basin Export Reduction Optimization Support Tool (RBEROST).
  • Application of RBEROST in a case study within the Upper Connecticut River basin, USA.
  • Analysis of least-cost combinations of management practices for nutrient reduction.

Main Results:

  • Optimized plans ranged from $18.0 million to $41.0 million annually over 15 years.
  • Urban stormwater management practices constituted a significant portion of the costs.
  • Incorporating a 2% margin of safety increased the probability of success from 37.5% to 99%.

Conclusions:

  • RBEROST effectively identifies cost-efficient nutrient reduction strategies for large river basins.
  • The tool's large spatial scale and consideration of diverse nutrient sources enhance its applicability in watershed planning.
  • Optimized management plans, particularly those addressing urban stormwater, are crucial for meeting water quality targets.