New Zealand's Largest Pressure Sewer Network - Reticulationg Kumeu, Huapai & Riverhead

The Kumeu, Huapai & Riverhead pressure sewer scheme is the largest pressure sewer network in New Zealand. The communities of Kumeu, Huapai and Riverhead had a need for a reticulated wastewater service to remove the public health risk of failing septic tanks and to meet the demands of significant population growth. 

Technical requirements of the project included servicing an initial population of 1,447 properties, whilst also providing capacity to service a final population of 5,906 properties. The network was also required to comply with strict hydraulic and wastewater quality requirements, including a maximum discharge flowrate of 85 l/s, in addition to being simple to operate and maintain. 

This paper outlines the technical challenges and solutions the team developed to meet those challenges and how Watercare Services Limited has met the needs of the communities of Kumeu, Huapai and Riverhead.