Future urban and population growth in Porirua and Wellington City is a fundamental driver for focusing improvements on the wastewater network. The treatment plant itself is highly effective, and recent upgrades have ensured it can meet current flows.
However, we are proposing further capacity upgrades as part of replacing the current discharge consents, which expire in October 2020. This will ensure the treatment plant has ample capacity for projected growth out to 2060.
The other critical component is managing flows of wastewater from the network to the plant during major wet weather events. That is why our focus will not only improve capacity of the plant but enable flow control.