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Norton's National Sewer Tour. It's time to talk about safety factors for sewers.

From Water Environment Association Conference 2022,

There has been much discussion in our industry about the use of 0.28 L/s/ha as peak long term I/I allowance (safety factor). Its use is not well understood by our industry. See graphic at right. The 0.28 L/s/ha (half that in BC) that is used in the sanitary sewer design sheets across Canada is a long-term safety factor.

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