Water Quality Planning in Rivers: Assimilative Capacity and Dilution Flow

Seyed Arman Hashemi Monfared, Mohsen Dehghani Darmian, Shane A. Snyder, Gholamreza Azizyan, Bahareh Pirzadeh, Mehdi Azhdary Moghaddam

Research output: Contribution to journalReview articlepeer-review

22 Scopus citations


Population growth, urbanization and industrial expansion are consequentially linked to increasing pollution around the world. The sources of pollution are so vast and also include point and nonpoint sources, with intrinsic challenge for control and abatement. This paper focuses on pollutant concentrations and also the distance that the pollution is in contact with the river water as objective functions to determine two main necessary characteristics for water quality management in the river. These two necessary characteristics are named assimilative capacity and dilution flow. The mean area of unacceptable concentration (ca¯) and affected distance (X) are considered as two objective functions to determine the dilution flow by a non-dominated sorting genetic algorithm II (NSGA-II) optimization algorithm. The results demonstrate that the variation of river flow discharge in different seasons can modify the assimilation capacity up to 97%. Moreover, when using dilution flow as a water quality management tool, results reveal that the content of (ca¯) and X change up to 97% and 93%, respectively.

Original languageEnglish (US)
Pages (from-to)531-541
Number of pages11
JournalBulletin of Environmental Contamination and Toxicology
Issue number5
StatePublished - Nov 1 2017


  • Assimilation capacity
  • Dilution flow
  • Optimization
  • River
  • Water quality

ASJC Scopus subject areas

  • Toxicology
  • Pollution
  • Health, Toxicology and Mutagenesis


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