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This study presents a comprehensive assessment of urban impact on water chemistry in canal systems using an innovative integration of analytical techniques. Three major canals in a rapidly developing Central Asian urban center were examined at pre-urban and post-urban locations to quantify anthropogenic influences on water quality parameters. Laboratory analyses conducted in 2024 revealed significant exceedances in regulatory threshold values for heavy metals, with chromium (Cr6+) concentrations reaching 0.009 mg/dm3 and iron (Fe) at 0.12 mg/dm3, exceeding permissible limits. Biochemical oxygen demand demonstrated marked increases in post-urban canal segments, with values reaching 16.4 mg/dm3—approximately fourfold above regulatory standards. Analysis of Water Pollution Index data from national monitoring datasets (2022–2024) documented progressive water quality deterioration along the urban gradient, with classifications shifting from “clean” to “very dirty” in certain canals post-urban transit. The novel application of Harrington's desirability function provided enhanced analytical resolution, revealing “very high,” “high,” and “moderate” contamination impact levels across different canal systems—a stratification not fully captured by traditional Water Pollution Index methodology. Temporal analysis identified peak contamination during summer months, coinciding with critical irrigation periods and reduced flow rates. This methodological integration offers superior analytical precision compared to single-method approaches, demonstrating the utility of complementary assessment techniques for urban water quality monitoring. The findings suggest significant implications for downstream agricultural activities and highlight the need for enhanced urban wastewater management, including artificial jet aeration systems and strengthened regulatory frameworks. This approach provides a transferable methodology applicable to urban canal systems globally, particularly in rapidly developing regions facing similar water quality challenges.

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Comprehensive Assessment of Water Chemistry and Urban Impact on Canals in Uzbekistan: A Multi-method Analysis

  • 会议论文

  • 发表日期：

    2026年

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  • Maloxat Abdukadirova,
  • Azamat Mutalov,
  • Oleg Pochuzhevskyi,
  • Abdusamin Gapirov,
  • Islom Aripov

摘要

This study presents a comprehensive assessment of urban impact on water chemistry in canal systems using an innovative integration of analytical techniques. Three major canals in a rapidly developing Central Asian urban center were examined at pre-urban and post-urban locations to quantify anthropogenic influences on water quality parameters. Laboratory analyses conducted in 2024 revealed significant exceedances in regulatory threshold values for heavy metals, with chromium (Cr6+) concentrations reaching 0.009 mg/dm3 and iron (Fe) at 0.12 mg/dm3, exceeding permissible limits. Biochemical oxygen demand demonstrated marked increases in post-urban canal segments, with values reaching 16.4 mg/dm3—approximately fourfold above regulatory standards. Analysis of Water Pollution Index data from national monitoring datasets (2022–2024) documented progressive water quality deterioration along the urban gradient, with classifications shifting from “clean” to “very dirty” in certain canals post-urban transit. The novel application of Harrington's desirability function provided enhanced analytical resolution, revealing “very high,” “high,” and “moderate” contamination impact levels across different canal systems—a stratification not fully captured by traditional Water Pollution Index methodology. Temporal analysis identified peak contamination during summer months, coinciding with critical irrigation periods and reduced flow rates. This methodological integration offers superior analytical precision compared to single-method approaches, demonstrating the utility of complementary assessment techniques for urban water quality monitoring. The findings suggest significant implications for downstream agricultural activities and highlight the need for enhanced urban wastewater management, including artificial jet aeration systems and strengthened regulatory frameworks. This approach provides a transferable methodology applicable to urban canal systems globally, particularly in rapidly developing regions facing similar water quality challenges.