Pipe Materials in Calgary Presentation Slide #09

This version highlights where the replacement has been by turning from red to white any break that is on pipe now replaced. A lot of that expensive 15 and 20 mile per year replacement program in the late 80's and early 90's was in this area. But note also, the blocks of DI that not only survive, but to this day, have very few breaks. We've recently run a Hydroscope through some of those mains, and a few barely even have pits, though they are just a few hundred metres from blocks that had to be replaced very young. Corrosion is highly dependent on local soils. To look at the very worst locality, I'd like to zoom in further to the south end of this picture, about six square miles of the system that was a mixture of CI and DI.