Dynamic Modelling of Pressure Sewerage Systems

The design of pressure sewer systems in New Zealand has typically been carried out using static models; yet pump systems on the market today are ‘smart systems’, so why not design smarter? Dynamic modelling can optimise the design of pressure sewer systems, allowing the smart functions of the pump systems to be incorporated into the design. This is a relatively new concept in New Zealand, generally being perceived as costly and unnecessary. However, in using the right approach and understanding the hydraulic software, dynamic modelling can provide a robust, optimised design that reduces capital costs and better informs the client about how their asset will perform.

Clients and designers should be made aware of these benefits, so they can make an informed decision when undertaking these projects. This paper discusses these advantages, using the example of a modelled system for a pressure sewerage upgrade at Himatangi Beach in the Manawatu District; one of the first such models used in New Zealand.