I swear I have spent nearly a decade regularly googling variations of “industry river development Middle Ages” without success, so I’m very pleased!

If you have not found Roberta Magnusson's work yet, it may be of interest, especially Water Technology in the Middle Ages--she goes later than I do!

Thanks, that’s very helpful! The main thing I’m looking for is laws and regulations about industries on the river, e.g., where the dyers and tanners can set up shop so that their effluvia doesn’t ruin other industries downstream