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A police officer estimated the water level was 12ft below the top, the judge added.

He urged the Welsh government "to fund Welsh Water to continue to maintain water levels and keep all the operators of this canal in business - it cannot be lost".

But water levels in the state’s major reservoirs stand at 112% of the historical average, and statewide precipitation is about average for this time of year.

Last year residents became increasingly concerned over rising water levels within the mining void.

The study, which was published this week in the journal Science, showed that even this large influx of water made up for only a portion of the declines in water levels in recent years.