Monitoring to detect changes in water quality to meet policy objectives.

If we assume a positive trend in annual median NO 3 -N concentration (e.g., in the 5 years prior to year 0) equivalent to 5% per annum was detected and maintained at the same magnitude, then in 10 years the concentration will be 1.5 mg L -1 .

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S1 - 9 for the number of sites with a significant trend).

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