Summary
This empirical study demonstrates that urban water systems in Amsterdam are major contributors to river plastic pollution, with an estimated 2.7 million plastic items annually entering the connected IJ river. Monthly visual monitoring at six outlets revealed weak correlations between environmental drivers (rainfall, sunlight, wind, tidal patterns) and litter transport, indicating that poorly understood mechanisms govern plastic emission and retention within urban water infrastructure. The authors advocate for high-frequency monitoring, advanced sensing technologies, and stakeholder co-design to identify litter origins and reduce urban plastic pollution.
UK applicability
This methodology and finding are directly applicable to UK urban water systems and river pollution assessment. UK cities with similar canal and drainage networks (London, Manchester, Birmingham) could benefit from comparable monitoring protocols to quantify plastic inputs and inform local water management policy.
Key measures
Monthly visual counts of floating litter at six urban water system outlets; estimated annual plastic item flux; correlation analysis of environmental variables (rainfall, sunlight, wind speed, tidal regimes) with litter abundance
Outcomes reported
The study quantified plastic litter flux from Amsterdam's urban water system, estimating 2.7 million items annually entering the IJ river. Environmental drivers (rainfall, sunlight, wind speed, tidal regimes) showed weak correlations with litter transport, suggesting additional unknown factors influence pollution dynamics.
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