Glen Dhu Combined Sewer Improvements Project

Glen Dhu Street is within Launceston’s combined drainage area, where one network of pipes drain both storm water and sewage. The responsibility for drainage in this area is split between City of Launceston (CoL) who is the storm water authority and TasWater who is the sewerage authority and owns the piped drainage network. The Launceston Combined Drainage System Service Agreement between City of Launceston and TasWater was established in 2016.

In winter and spring 2013 storm water runoff and surcharging of combined sewerage manholes during heavy rainfall events caused localised property flooding around the Glen Dhu St area. Both City of Launceston and TasWater operations staff were involved in the emergency response.

The reasons for the flooding can be summarised as:

  • Inadequate capacity of the piped drainage system and blockage of inlet pits.
  • Lack of clear overland flow paths to protect properties from flooding when the piped drainage system is full.
  • Buildings constructed in overland flow paths with low floor levels.

A number of the properties affected were business premises, including Door of Hope, Launceston Learn to Swim Centre (LLSC) and Asco Business Developments.

After multi-criteria analysis (MCA) was run during August 2018 involving representatives from various areas within TasWater as well as City of Launceston, a tender assessment process resulted in a contract being let to Zanetto Civil to undertake the works. The upgrade works will involve installing a number of pipes in the area of the Pipeworks Road overpass on the Midland Highway.

This program of works is designed to increase the capacity of the piped drainage system in the Glen Dhu area where one network of pipes drain both storm water and sewage. This will help reduce surcharging from sewerage manholes during heavy rainfall events, which has caused localised property flooding around the Glen Dhu Street area over a number of years.

TasWater will start combined drainage upgrade works in the Glen Dhu area on Tuesday, 26 March 2019.

Traffic management controls will to be put in place to provide a safe working environment for contractors working close to fast moving highway traffic.

The traffic and pedestrian controls will include:

26 March 2019 to 13 June 2019

  • While concrete barriers are being installed or removed, road speed will be reduced temporarily to 60 km/h from Wilson Street to Thistle Street and to 40 km/h from Thistle Street to the Pipeworks Road slip lane merge onto the highway.

  • Outside of installation or removal of the barriers, reducing the speed limit to 80 km/h for outbound traffic on the Midland Highway to after the Pipeworks Road slip lane merge onto the highway.

  • The emergency lane on the eastern side of the Midland Highway for outbound traffic will be closed from 100 meters before the Pipeline Bridge overpass to 100 meters past the overpass with concrete barriers installed.

26 March 2019 to 29 August 2019

  • Pedestrian access along the side of the Midlands Highway from Pipeworks Road to Thistle Street will be closed.

13 June 2019 to 29 August 2019

  • Pipeworks Road slip lane to the Midlands Highway southbound will be close

If you have any questions, please contact our Community Engagement Officer, John Murray, on 0437 226 563 or john.j.murray@taswater.com.au . Alternatively, you can call our Call Centre on 13 6992 or via enquiries@taswater.com.au

Glen Dhu Street is within Launceston’s combined drainage area, where one network of pipes drain both storm water and sewage. The responsibility for drainage in this area is split between City of Launceston (CoL) who is the storm water authority and TasWater who is the sewerage authority and owns the piped drainage network. The Launceston Combined Drainage System Service Agreement between City of Launceston and TasWater was established in 2016.

In winter and spring 2013 storm water runoff and surcharging of combined sewerage manholes during heavy rainfall events caused localised property flooding around the Glen Dhu St area. Both City of Launceston and TasWater operations staff were involved in the emergency response.

The reasons for the flooding can be summarised as:

  • Inadequate capacity of the piped drainage system and blockage of inlet pits.
  • Lack of clear overland flow paths to protect properties from flooding when the piped drainage system is full.
  • Buildings constructed in overland flow paths with low floor levels.

A number of the properties affected were business premises, including Door of Hope, Launceston Learn to Swim Centre (LLSC) and Asco Business Developments.

After multi-criteria analysis (MCA) was run during August 2018 involving representatives from various areas within TasWater as well as City of Launceston, a tender assessment process resulted in a contract being let to Zanetto Civil to undertake the works. The upgrade works will involve installing a number of pipes in the area of the Pipeworks Road overpass on the Midland Highway.

This program of works is designed to increase the capacity of the piped drainage system in the Glen Dhu area where one network of pipes drain both storm water and sewage. This will help reduce surcharging from sewerage manholes during heavy rainfall events, which has caused localised property flooding around the Glen Dhu Street area over a number of years.

TasWater will start combined drainage upgrade works in the Glen Dhu area on Tuesday, 26 March 2019.

Traffic management controls will to be put in place to provide a safe working environment for contractors working close to fast moving highway traffic.

The traffic and pedestrian controls will include:

26 March 2019 to 13 June 2019

  • While concrete barriers are being installed or removed, road speed will be reduced temporarily to 60 km/h from Wilson Street to Thistle Street and to 40 km/h from Thistle Street to the Pipeworks Road slip lane merge onto the highway.

  • Outside of installation or removal of the barriers, reducing the speed limit to 80 km/h for outbound traffic on the Midland Highway to after the Pipeworks Road slip lane merge onto the highway.

  • The emergency lane on the eastern side of the Midland Highway for outbound traffic will be closed from 100 meters before the Pipeline Bridge overpass to 100 meters past the overpass with concrete barriers installed.

26 March 2019 to 29 August 2019

  • Pedestrian access along the side of the Midlands Highway from Pipeworks Road to Thistle Street will be closed.

13 June 2019 to 29 August 2019

  • Pipeworks Road slip lane to the Midlands Highway southbound will be close

If you have any questions, please contact our Community Engagement Officer, John Murray, on 0437 226 563 or john.j.murray@taswater.com.au . Alternatively, you can call our Call Centre on 13 6992 or via enquiries@taswater.com.au