Pipe Materials in Calgary Presentation Slide #06

This is a map of Calgary from my point of view: just the water mains, and colour-coded by material type. It shows what I call the growth rings of our city very plainly, with the dark blue as the thick-wall cast iron from 1900 to 1955, thin-wall cast in magenta from 55-68, and the light blue of DI from 68 to 78. I lump all the DI together except the YDI, which is orange, and then the PVC is the green in the outermost ring. The Grey is the colour for "other" much of which is concrete feedermains, and our brief flirtation with AC down in the south end in the early 70's.
Calgary is kind of the Canadian Denver, with metric instead of US units: if you are the mile-high city, we are the kilometre high city. We are right at the start of the foothills of the Rockies, varying by over 1000 feet in elevation from the nearly-level plains on the east side, to the two hills that dominate the northwest. The major growth area in the 70's was in the flat area in the northeast, where there had formerly been a lot of ponds and sloughs and the soil was far more corrosive than anything we'd encountered previously. I'd like to zoom in on that area.