Huapai wastewater network: Renewal of a gravity wastewater network with a pressure waste collection system
Annual Conference
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The township of Huapai, northwest of Auckland in Rodney District, has had an existing gravity wastewater system replaced with a Pressure Waste Collection (PWC) system. This paper considers the driving factors in the selection of PWC as a solution for Huapai, making it the first gravity wastewater network replaced with a PWC system in New Zealand.
Application of PWC systems are typically confined to flat areas, low lying areas with a high water table or steep and rocky terrain. The use of PWC in Huapai is an example of attributes of the system being utilised to provide additional benefits, primarily in the immediate removal of inflow and infiltration from the existing catchment.
The potential advantages of PWC systems are discussed including the utilisation of operational storage to assist with network capacity issues and deferment of capital expenditure on trunk transfer mains, pump stations and other points of capacity restriction.