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When I get a moment, I must find out how many boats have been down that way in this warm, sunny July, the peak of the holiday season. The warmth will have encouraged the vegetation, but I suspect relatively few boats have been through. And only two boats entered the Royal through Dublin in July, even though two openings were offered.
Apart from giving artistic verisimilitude to an otherwise bald and unconvincing narrative about the value of the canal tourist industry and the abiding love of boaters for the canal, using canals helps to keep the weed down.
Irish waterways history 