diversion to the New Plymouth WWTP was completed prior to 2000, only intermittent
discharges from the Inglewood WWTP have occurred, related to intense rainfall events and high stormwater
inflows. Any periods of overflow events are monitored by NPDC (wastewater only), with samples collected
and analysed by them at the time of each event.
Prior to the wastes diversion, the consent holder had been required to monitor effluent quality on a two-
monthly basis, as a special condition of discharge
also noted that attempts had been made to prevent discharges to ground by placing a plastic liner
under a unit. Unfortunately the control fell short of being useful because there were no sides that would act
as a bund, therefore during a rainfall event any discharges onto the liner would become entrained in
stormwater and flow onto the site. Staff needed to know how to correctly install a bund, with a process set
up to ensure that this activity could be carried out correctly by anyone in the
few issues lately with people dumping cars.
Good progress is happening on the Monmouth Road culvert replacement, all
going well it will be completed by the end of February.
A few slips occurred following the 28 December rainfall event. Currently working
on a design for a few retaining walls.
Have had a meeting with Ayden and Junine around Stratford high school on
Swansea road.
Have purchased four warning signs for Beaconsfield Road and Manaia Road.
Concerns have
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
noted.
During the inspection undertaken on 26 June 2024, it was noted that significant volumes of red sand-
blasting garnet was present under zones 11 and 12, as well as around both roadside stormwater drains
underneath the pipe rack. The inspection was carried out following rainfall and it appeared that the large
volume of stormwater had washed the garnet and associated contaminants towards, and probably into, the
stormwater collection system. Staff onsite advised that recent works carried
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
information on the hydrogeology of the Taranaki
region presented in this section is from TRC (1996) and/or Stevens (2001).
3.1 General overview
Knowledge of the climate, landforms, and geology is required to understand a
region’s hydrogeology.
Taranaki’s rainfall patterns are closely related to elevation and exposure to the main
rain-bearing northerly to westerly winds. Rainfalls averaging less than 1,600 mm/year
occur only in the southern part of the region and on a narrow coastal strip of
Figure 2 Depth of sites selected for inclusion in the 2011-12 survey (m
below ground level) 6
Figure 3 Average annual rainfall volumes for Taranaki 2008 to 2013
(TRC) 9
Figure 4 Top-rock geology of the Taranaki region (Newsome et al.
2008) 11
Figure 5 Distribution of soil types across the Taranaki region
(Newsome et al. 2008) 12
Figure 6 Distribution of the aquifer units across the Taranaki region
(Brown 2013) 14
Figure 7 Dairy statistics for the Taranaki region (2002 to
does or does not affect the current and future
allocation of water upstream of the dam.
Conditions 4 to 8 define the minimum flow that is to be maintained in the Patea River
downstream of the dam, and allows for a lower minimum flow when less than normal
rainfall reduces inflows.
Conditions 9 to 12 define the minimum and maximum allowable lake levels for winter
and summer periods, specifies the required spillway gate settings during a high lake
level, and allows for some flexibility in
survey and heavier rain later in the morning. The survey was
preceded by moderate rainfall 24 hours prior sampling (13.5 mm) at Brooklands Zoo rain gauge. There was
a light mist/intermittent drizzle during sampling. Over the last seven days prior sampling 66 mm of rain was
measured at Brooklands Zoo rain gauge. Samples collected were also assessed for odour.
Out of the 11 samples collected, one had a distinctive odour, described as earthy/woody, coming from
STW001157, which suggests the