in rainfall patterns have
caused difficulties at various sites in the past as localised rainfall may impact on
bacteriological quality on isolated occasions]. Where necessary, a 2 metre sampling
pole was used for bacteriological sample collection immediately beneath the water
surface and at a minimum of calf depth at the sites. Thirteen samples were collected
from each site during the season.
Samples were analysed for enterococci, E. coli and faecal coliform bacteria, turbidity
and
of DO concentration (g/m3) with consent conditions in the primary and
secondary oxidation ponds in 2016-2017, between the hours of 11:00 and 14:00.
Data was collected from the pond outlet 11
Figure 3 Faecal coliform counts in the final effluent from the maturation cells (1992-2017) 14
Figure 4 Daily discharge volumes (m3/day) from the HWWTP and daily rainfall data (mm)
from a Council rainfall station located approximately 5 km east of the site (2016-2017) 16
Figure 5 Map of
The Waitara scheme is now very resilient. But there remains a small risk that damage could
occur during a very large flood, which might compromise the level of protection afforded to
the township. We keep a careful eye on the scheme’s performance during very heavy rainfall
and occupants can expect a timely warning if we do see greater risks emerging.
However, the risk factor today is extremely low compared with other risks to property, such
as damage from high winds.
Lower
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).
At the time of the application it was indicated that, as a result of stormwater inputs to the pond, the
discharge rate from the pond to the Mangorei Stream would be
heavily fished.”
Kayaking and rafting
The Waiwhakaiho River is one of the five main whitewater kayaking rivers in Taranaki, along
with the Stony, Mangorei and Manganui Rivers and Kiri Stream. The Waiwhakaiho is navigable
from the National Park to the sea, and flow recommendations are for after rainfall at 20m3/s,
although it is possible to ‘scrape by with less’.
There is no advertised commercial rafting on the Waiwhakaiho River, but it is offered by
TOPEC as one of their adventure
grass sowing,” says the
Council’s Director-Operations, Stephen
Hall.
“The storm’s impact on the ring plain was
Continued Page 2
Mapping a very wet winter
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Rainfall over the winter months of June, July and August was well above the season’s
normal at sites monitored by the Taranaki Regional Council, as illustrated by this map
showing totals at some of our measuring stations.
hydrogeologic conditions (Taylor and Evans, 1999). These result in a complex
system of unconfined, perched and semi confined aquifers within the volcanic deposits. The water table in
the ring plain area is typically encountered between 1 to 10 m below ground level. Seasonal variations in
water table depth of up to 5 m are common. Groundwater flow generally reflects surface topography and
flows radially from Mount Taranaki. Recharge to the Taranaki volcanic aquifers is mainly by rainfall
hydrogeologic conditions (Taylor and Evans, 1999). These result in a complex
system of unconfined, perched and semi confined aquifers within the volcanic deposits. The water table in
the ring plain area is typically encountered between 1 to 10 m below ground level. Seasonal variations in
water table depth of up to 5 m are common. Groundwater flow generally reflects surface topography and
flows radially from Mount Taranaki. Recharge to the Taranaki volcanic aquifers is mainly by rainfall
three day period
following significant river/stream fresh conditions. [NB: regional differences in
rainfall patterns have caused difficulties at various sites in the past as localised
rainfall may impact on bacteriological quality on isolated occasions]. Where
necessary, a 2 metre sampling pole was used for bacteriological sample collection
immediately beneath the water surface and at a minimum of calf depth at the sites.
Thirteen samples were collected from all but one site (12 samples)
dot) 8
Figure 6 E-BAM set-up and instillation at Central School, New Plymouth 9
Figure 7 Location of Meteorological Stations with respect to the Central School monitoring site 11
Figure 8 Wind rose for the whole monitoring period (from hourly data) 12
Figure 9 Frequency of rainfall with wind direction 12
Figure 10 Boxplots of daily mean PM2.5 over the monitoring period 14
Figure 11 Number of days per year with PM2.5 concentrations 15
Figure 12 Temporal variations in …