After 30 Attempts To Cut Through The FOG, The Wet Well Wizard Makes Major Improvements

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.