The Pipemaker’s Canal runs through three cities, lastly Savannah, GA before pouring its collection into the Savannah River. The canal’s origins date the early national period when two rice magnates had it constructed to help with the water management of their rice plantations. Given the era of its construction enslaved laborers likely did much or all of the work although I could not verify that with a cursory search.
Today it continues to serve Chatham County, Georgia by draining lands that grow houses and commercial centers. Current challenges with Pipemaker’s Canal and development pressures are covered in a recent article in SavannahNow.