The largest such effort is China's South - North Water Transfer Project, look into that if you are interested in the subject. Its unbelievably gigantic in scal

The largest such effort is China's South - North Water Transfer Project, look into that if you are interested in the subject. Its unbelievably gigantic in scale, yet the amount of water moved is relatively modest compared to the amount of consumption. https://en.wikipedia.org/wiki/South%E2%80%93North_Water_Transfer_Project https://en.wikipedia.org/wiki/South%E2%80%93North_Water_Tran... California is also an enormous plumbing project, much has been written on it.