August 19, 2017

North St. Balmain GPT

BALANCE_Banner_Hyd_North St

As part of the Sydney Water Corporations “Stormwater Environment Improvement Program” (SEIP) there was a proposal to construct a large Gross Pollutant Trap (GPT) on a underground Box Culvert system in North Street Leichardt in Sydney.

The original design consultant wanted to utilise a Collapsible weir system inside the box culvert to divert flow out of the culvert and into the Gross Pollutant Trap (GPT) or Pollutant Capture Device (PCD). Sydney water required indisbutable evidence that the concept would not compromise system capacity.

As a result BALANCE RnD were engaged to test the concept using a physical hydraulic model. The model showed that the treatable flow rate claimed was unacheivable and that there was a localised presurisation of the system where the diversion rejoined the original system due to an internal hydraulic jump forming.

This meant that pits locally had to be bolted down to avoid surcharge and flooding of the street. The tests resulted in several recommendations and these were implemented during construction.

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