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    There are differences between the data available on the Environment Agency’s website and the National River Flow Archive, which time series should I use?


    We work closely with the National Flow Archive to ensure the daily flow data we provide them with is the same as we hold in our archive. Over time there is a risk that there may be small differences for a small percentage of the record at a few sites. The Environment Agency will regard its data as correct unless there is evidence to prove otherwise.

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