LOL, such channels are trivial from a roman point of view. Roman water engineering was not reached again until the 18th century when french and english engineers started to take care about these big sinkholes called Paris and London. And who says that the romans had no water-mill driven forges? Do you really believe, that they had water driven saw-mills, but no hammer mills?Why? Medieval engineers built the Naviglio Grande; there were water powered forges in 14th century England, which the Romans never had as far as we can tell.
I am afraid, if industrialization happens in the roman world based on water mills, they simply move the Tiber 100km to the north, because some buerocrat decides, that they need the water over there.
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