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)
RTC Agenda 1 March 2023 website
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
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
NZ ShakeOut | national earthquake drill | 9.15am, 15 October | www.shakeout.govt.nz
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.
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 …
stormwater sampling and release records and inspections of the discharge
point and receiving waters in the Herekawe Stream. Scheduled inspections were carried out on 16 August
2021, 4 February 2022, 11 March 2022 and 21 June 2022. Notes from these visits are summarised below.
16 August 2021
On site 10:45 to 11:15. Weather was fine with a light northwesterly wind. 15 mm of rainfall had been
recorded over the previous week at the Brooklands Zoo station. Stormwater ponds were sampled for
opportunities and constraints for improving farm dairy effluent management .......... 23
6.1 Soil characteristics .................................................................................................................... 23
6.2 High rainfall and seasonal considerations ............................................................................ 23
6.3 Taranaki river flows and characteristics ............................................................................... 24
6.4
ponds
2014-2015 (between hours of 1100 – 1400). Data from pond
outlet. 13
Figure 3 Faecal coliform numbers in the HWWTP effluent(s), 1992 to
2015 15
Figure 4 Daily discharge volumes (m3/day) from the Hawera
oxidation ponds system and daily rainfall data (mm) from a
Council rainfall station approximately 5 km east of the
Hawera oxidation ponds, 1 July 2014 to 30 June 2015 17
page
iv
Figure 5 Location of marine ecological monitoring sites 18
Figure 6 Mean
structures;
viii) The locations of all specific points of discharge from the work area to the environment; and,
ix) Any other relevant site information.
d) Construction timetable for the erosion and sediment control works and the bulk earthworks
proposed;
e) Maintenance, monitoring and reporting procedures;
f) Rainfall response and contingency measures including procedures to minimise adverse effects in
the event of extreme rainfall events and/or the failure of any key erosion and