Pilot project to test repair methods on Tinwald's sewer network

Tinwald’s wastewater pipes will be put under the microscope as the Ashburton District Council looks to determine the best method of extending the life of the area’s aging infrastructure.

The $60,000 project, which started on June 8, sees different repair methods being tested on the pipelines and manholes in a few locations around Tinwald to determine which system will provide the best result and improve the performance of the network.

This project is part of a two-pronged approach to the issue of reducing the potential for water to enter the sewerage network.

In November last year Council launched the "Right Pipe" project which identifies where incorrectly constructed drainage systems are resulting in stormwater entering Council’s sewerage network.

Assets Manager Andrew Guthrie says the repair trials are an excellent test to determine the most suitable method to limit the ground water infiltration.

He says that some parts of the Tinwald network can experience overflows from the sewer network when there is a consistent period of heavy rain coincided with high groundwater levels.

This repair work, in collaboration with the Right Pipe, should reduce the opportunity for groundwater and stormwater to enter the sewer system and cause an overflow.

The different repair methods will be monitored and assessed over a number of months.

"Once we confirm what method works we can then look at the rest of Tinwald and schedule in a repair work programme to start next year. The aim is to extend the useful life of the pipes for another 10 to 15 years and delay the need to carry out a more costly replacement programme."

Page reviewed: 16 Jun 2015 9:42am