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In page River Tone:

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Traffic on the river in 1823 was 39,516 tons, which generated tolls of £2,194. After the construction of the canal, traffic steadily declined, until income was insufficient to cover maintenance by the early 1860s. The canal company used a similar accounting practice to manage the Tone debt, inflating it at six per cent each year, to ensure that they could demonstrate that the river was unprofitable.[1]