2015 CSO Master Plan Symposium Livestreaming

[youtube https://www.youtube.com/watch?v=kYbNY-VjJGE]


5 comments on “2015 CSO Master Plan Symposium Livestreaming
  1. Phil Chilton says:

    The big error in waste water design is using too small of inside diameter PVC pipes. Eight inches or 200 mm is too small. The minimum has to be raised to sixteen inches or 400 mm.
    Chancellor in Fort Garry is a very good example why 8″ pipe is too small. A large additional load was added to the existing infrastructure during the 1980’s with disasterous effects. All because there was no upgrade to handle the increased load.
    The downtown area is mostly all 16″ pipe because its a combined system and the oldest part of the city. The engineers believe when one 16″ pipe is replaced by two pipes, the pipe size can be cut in half. Silly old rabbits. Sewage is not at like potable water. Only 90% of sewage moves down the pipe. There’s 10% that does not move. In fact, 10% keeps on pilling upon the previous 10% that settles until the pipe is blocked. People get raw sewage backing up into their basements and then call 311 for some service.
    The moral is use 16″ or 400mm just as engineers of 1900 did. Sickness and disease has to be minimized, not pipes.

    • admin says:

      Thank you for your comment Phil.

      Since the 1970s the current minimum diameter for a City sewer main is 250 mm, or 10”. Common sewer diameters are 10”, 12”, 15”, 18” (250mm, 300mm, 375mm, 450mm), while 16” pipe is more of a water main size.

      The City’s standards also require pipes to be at a slope sufficient to have the velocity required to scour and remove the sediment from the pipe. In fact, sometimes using too large a pipe can result in an increase in sediment buildup due to the flow slowing down. Pipe sizes are always chosen based on the expected flows and installed at a grade to minimize sedimentation. Additional information on City design standard can be found on our website.

      Also, the City has an extensive sewer main clearing and inspection program that removes any buildup and helps to identify trouble spots.

  2. Cheron Long-Landes says:

    I don’t know enough about the subject to comment, and that is why it was my intention to attend this evening. I am not feeling well, so will postpone to another meeting. I will follow the discussion through the website. Thanks for giving the public an opportunity to participate and be heard.

  3. Robert Kury says:

    One of the questions at the symposium was, “Do CSO affect the rivers colour?”. Supposedly the correct answer is no. I have witnessed a City CSO discharging to the Assiniboine River and it was black and smelled sewage-like not brown and odourless like the river. That black discharge hugged the shoreline and eventually was eddied into the main river. This discharge was occurring during normal weather conditions and not during some winter melt or wet weather event. The outfall’s location is along the river walk between the Forks and the Legislature, I think, just east of the Mid-town Bridge. Outfalls of this nature need to be on the City’s priority list for correction.

    • admin says:

      Thanks for your comment Robert.

      Winnipeg’s rivers are naturally murky brown in appearance due to the large amounts of suspended soils in the water, which isn’t affected by CSOs.

      If you see discharge to the river, such as the one you describe, please note the date, time and location and report it to 311.