By Robin Knowles, Cam McGrail, and Peter Gohns
The Memorial Park Pump Station (MPPS) transfers wastewater flows from Memorial Park to Chapel Street WWTP and/or Te Maunga WWTP. It is a large pump station (PS) installed within a 9.0m diameter concrete structure. The pump station is approximately 12m deep, with a 6.5m maximum water depth and split into several compartments.
The MPPS has a peak wet weather flow of 890 l/s and operates in several modes to deal with the flows and supports flushing the pressure main. This results in the PS once a day shutting down and building up sufficient effluent to flush the well at a rate of 810L/sec for 5 minutes, reducing retained volumes significantly.