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What are the ways a society with medieval or at most middle age technology go about widening and deepening a river?

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    $\begingroup$ Did you ask google first? $\endgroup$ Mar 30 '20 at 14:31
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    $\begingroup$ "Winding"? What do you want to do to the poor river? Anyway, the answer is shovels. Lots of shovels. See the Naviglio Grande for a 50 km long canal dug in the 12th and 13th centuries (1179 to 1258, 90 years of digging). $\endgroup$
    – AlexP
    Mar 30 '20 at 14:40
  • $\begingroup$ Yes I did ask Google it provided little information all I found out is the process is called dredging not how medieval civilizations would have accomplished this $\endgroup$
    – Razorlazer
    Mar 30 '20 at 14:42
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    $\begingroup$ Shovels were invented before the middle ages. $\endgroup$ Mar 30 '20 at 15:00
  • $\begingroup$ I meant widening I'll edit it $\endgroup$
    – Razorlazer
    Mar 30 '20 at 15:11
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  • Canals have been dug in the classic era. Dig a big canal parallel to the river, then dam the river to redirect it onto the new, deeper bed.
  • Some dredging happened in Roman times, too.
  • Dam the river, remove major obstacles as the water falls, then re-open the dam.
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A technology that could change terrain didn't change until the industrial revolution. Everything had to be done by hand. People would usually dig out a canal and then built a dam. The water was forced to flow away. Then they could widen it, make it deeper, lay down stones on the bottom and sides to prevent it from changing course. (Which happens often with uncontrolled rivers) etc.

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