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House in Auckland

Delivering project efficiencies takes know how

The catchment of Grey Lynn in Auckland is one of the most complex wastewater networks in New Zealand with a mix of combined, foul and storm systems all interacting with each other.

ExpertiseHydraulic modelling


There are more than 30 operational engineered overflow points with a number expected to spill as often as 120 times per year. Our hydraulic modelling team is helping to create a detailed and robust planning tool to optimise the existing network and analyse future scenario conditions.


We installed 38 flow gauges to assess the performance of the catchment during dry days and wet weather events prior to the commencement of modelling. Our Moata analytical software has been critical to the model build and monitoring phases of the project. Survey data was synced with Moata to reduce programme time while the platform has also been essential in analysing past models and other datasets to understand the historic development of the catchment.


The project is currently at the verification phase but already providing useful information that will help to improve connectivity and efficiency. System performance analysis is set to commence in 2017 with service levels, emergency operations plans for spills and future design horizons all to be investigated and reported on.

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