Right off the bat, the municipalities have told us that when they're designing their water systems and they're designing the sewers, they use that. So yes, you could do without it, but then you're going to have a less efficient system.
Evidence of meeting #29 for Industry, Science and Technology in the 40th Parliament, 3rd session. (The original version is on Parliament’s site, as are the minutes.) The winning word was questions.
A recording is available from Parliament.