Tokomaru

The Tokomaru wastewater scheme was installed in 1975 & 1976. It consists primarily of 150mm dia. AC pipe with minor extensions carried out in 1981 and 1982. The system was installed to service the township as ground conditions were not suitable for private septic tanks that had been in use up until then. The system operates by gravity throughout.

Wastewater is treated by a single cell oxidation pond with mechanical aeration discharging into a constructed wetland installed in 2002. The residual effluent (after evaporation and infiltration) discharges into the Makerua Drainage Board No. 2 drain, which leads towards the Linton Main Drain.

The discharge is authorised by permits 101227 and 101228 which expire in 2017.

The operational parameters of the Tokomaru scheme are:

Population served:  600(approx.)
Connections: 139 

The key issue relating to the scheme is that a reduction in the infiltration rate is desirable.