Summary: 2019 Sewer Assessments - Mullumbimby
- Flow monitoring was undertaken in the Mullumbimby sewer catchment which identified that inflow and infiltration was evident.
- Further visual assessments, CCTV, and smoke testing were undertaken to confirm the condition of this portion of the network.
- Assessments included 109 gravity sewer mains and 107 stormwater urban mains in addition to associated maintenance structures.
- Assessments identified various assets requiring maintenance, rectification works, and/or renewal.
- A risk analysis was undertaken of each asset so that Council can prioritise the highest risk assets for the recommended works.
- The first scheduled works include:
- Structural relining of 27 sewer mains;
- Minor rectification of 27 sewer and stormwater mains, including various maintenance structures; and
- Reassessment of 26 sewer and stormwater mains (due to incomplete or obstructed original assessment).
- These works are expected to commence in February 2020 and be completed by June 2020.
- CCTV assessments of the remainder of the gravity sewer network will be on a priority basis.
- Byron Bay and Ocean Shores will be assessed as the next two highest priority sewer catchments between February and June 2020.
- The results from these assessments will enable Council to direct budget to Byron Shire's highest risk areas of the sewer network.
- All rectification works on gravity sewer mains can be done with a structural liner, which is a quicker, more cost effective, lower risk option than replacement and has a lower impact on community (noise, dust, traffic etc).
- Structural liners typically have a design life of at least 50 years.
- Council is seeking a comprehensive understanding of the condition of its gravity sewer and stormwater networks to ensure their integrity and function are maintained so associated risks can be managed accordingly.
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