resulted in discharges from the
wastewater network to waterways. Four of these incidents were related to pipe blockages or breakages, ten
were related to high rainfall events and the remaining three events were a result of mechanical faults or
technical errors. All incidents were investigated and assessed based on their cause, NPDC’s adherence to
their Incident Response Plan and the resulting environmental effects. With the exception of one water
sampling survey, no further action was considered
hours average about 2000 hours. Northwesterly airflows prevail
and sea breezes occasionally occur along the coast during summer.
The mountain and ranges have a strong influence on rainfall in the area by attracting
orographic type events which are often associated with frontal systems and depressions
moving through the Tasman Sea. Annual rainfall on the upper slopes of the northern
Egmont National Park ranges from 1500 to 5000mm.
Although the annual totals are quite high, the way in which
hours average about 2000 hours. Northwesterly airflows prevail
and sea breezes occasionally occur along the coast during summer.
The mountain and ranges have a strong influence on rainfall in the area by attracting
orographic type events which are often associated with frontal systems and depressions
moving through the Tasman Sea. Annual rainfall on the upper slopes of the northern
Egmont National Park ranges from 1500 to 5000mm.
Although the annual totals are quite high, the way in which
effluent also varies depending on the current
level of rainfall runoff. There are also minute quantities of other chemicals that are
used from time-to-time for research purposes.
Table 1 Pacific Natural Gut wastewater composition (approximate)
Component
Quantity
used per
month
Weight of
chemical
discharged
kg/month
Percentage
of process
effluent
g/m3 of
process
effluent
Percentage
of total
discharge
g/m3 of
total
discharge
District
excess of water may enter the
system during heavy or sustained rainfall, or if rainfall occurs when the plant is not operating. This excess is
discharged via a sand filter prior to entering the NPDC stormwater system, which discharges to the
Mangaone Stream immediately upstream of State Highway 3.
Allied Concrete holds water discharge permit 4539-2 to cover the discharge of stormwater and treated
wastewater from truck washing at a concrete batching plant into the Mangaone Stream in the
RTC Agenda 1 March 2023 website
shared with relevant NPDC staff and the contractor, via an online service provider, following each
inspection.
27 July 2018
It was fine at the start of the inspection, with a couple of showers near the end of the visit. There was a
moderate south-westerly wind. It rained every day in the week preceding the inspection, with 52 mm of
rainfall recorded at the Hillsborough monitoring station.
There were no off-site odours or dust issues observed prior to going on site. No refuse was noted
de-silted on an as required
basis. The second larger pond is unlined.
The size of the pond provides storage for a 10% annual exceedance rainfall event (AEP) event. The
maximum discharge rate from the pond during large rainfall events is 1,060 L/s as this is dictated by the size
of the outfall pipe (750 mm). However, there is also provision for the pond to overflow via a spillway
structure to a discharge swale (i.e. bypassing the 750 mm discharge pipe).
A the time of the application it was
confines of Port Taranaki.
The Taranaki region has a temperate climate with
generally abundant rainfall. The incised nature of
ring plain streams means that flooding is not a
major problem. However, occasional intense rainfall
events can lead to rapid rises in river levels and
flooding in hill country valleys and elsewhere.
Figure 1: The Taranaki Region
page
Working with people. Caring for Taranaki 19
The people
Figures from the 2023 census show Taranaki total
population
An inspection was conducted in mainly fine weather with a cool, westerly, moderate breeze. The monthly
rainfall was 162 mm as recorded at the Stratford TRC weather station.
The step screen was operating and wastes were fully contained. The influent flow rate was recorded as 99
m3/hr (28 L/s). The pond was operating a normal level, with a slightly turbid, green brown colour and a
lightly rippled surface. Three out of four aerators were operating, creating a swift pond circulation. No scum