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Byron Shire
April 21, 2021

Reinventing sewers

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Byron Shire Council’s (BSC) Water and Recycling are now saying they don’t have plans of their sewer gravity mains. 

As a former sewer operator, we spent ten years supplying information to the Mullumbimby Council office to generate maps of the gravity mains system.

There is a significant library of maps that were generated and stored. I and other staff used them over the years.

The Water, Waste and Sewer Advisory Committee meeting (WWSAC) of January 30 were informed of the relining of the Mullumbimby gravity mains by a company called Interflow. This company relined a sewer gravity main in Blundel Lane in Brunswick Heads as a test case. This main was just over a metre deep and laid in the sand, which was bone dry. The gravity mains of concern in Mullumbimby, as described in an earlier article by hydraulic engineer Duncan Dey, are the deep gravity mains. They are laid between four and six metres deep, in clay that is permanently wet. Council would want a guarantee from Interflow that their system would solve the infiltration problem under these conditions. Will Interflow guarantee this with no provisos?

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  1. what have I just read?
    a service announcement?
    a rant?
    a technically challenging engineering competition?
    Could somebody please clarify wht is going on here?

  2. Gina, Water and Rectcling put up a recommendation in 2019 that a five year investigation of the inflow infiltration of the gravity sewer mains in Mullumbimby. Water and Recycling asked that $500,000 per anuum be allocated for this, the elected council endorsed this, and a company was bought in to investigate and reline the gravity sewer mains. As stated previously in the ECHO by a member of the Water,Waste & Sewer Advisory Committee the company would do carry out the repairs on the worst ranked areas of the gravity mains. The company has supposedly done that but in the last rain event the Brunswick Valley Waste Water Treatment Plant”s inflow reached on the 22/03/2021 16,628.17 Kilo Liters in twenty four hours. Gina the average dry weather flow is 1.4 Kilo Litres per day. The repairs to the Gravity Sewer Mains have had no affect.


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