If you look at the map on page 31(it's been posted elsewhere before)
https://pievc.ca/wp-content/uploads/...tem-Report.pdf
You can see there are several lines that seem to connect. I just assume it's a lot more complicated than looknig at something like they may have reversed flow directions on some(? no idea), and there are also all the storage cisterns that complicate the picture. That's why I was wondering if an expert has said that, or it's just based on assumptions.