cyanobacteria were higher than in the previous
three seasons, and similar to the preceding two seasons, probably a reflection of the relative amounts of
rainfall causing freshes that scour streambeds of periphyton.
page
Timely reporting of the results of bacteriological water quality and cyanobacteria numbers/cover was
undertaken by use of the Taranaki Regional Council website (www.trc.govt.nz) and LAWA website
(www.lawa.org.nz), as well as liaison with territorial local
discharge point
and receiving waters in the Herekawe Stream. Scheduled inspections were carried out on 20 July 2022, 8
December 2022, 26 January 2023 and 6 June 2023. Notes from these visits are summarised below.
20 July 2022
On site 14:00 to 15:00 with Corteva staff. Weather was cloudy with a moderate northerly wind. 18 mm of
rainfall had been recorded over the previous week at the Brooklands Zoo station. Nīkau Contractors had
commenced demolition of the above ground structures. The site
3.1 Water balance method.............................................................................................9
3.2 Site Selection.........................................................................................................10
3.2.1 Rainfall and potential evapotranspiration .................................................10
3.2.2 Soil Types.................................................................................................. 11
3.3 Irrigation
2019-2020 monitoring year, with most
commencing irrigation in late October and concluding in March. Rainfall recorded at the Council’s
monitoring locations over the summer irrigation period ranged between 85% and 114% of historical mean
values. Total usage during the 2019-2020 irrigation season, across all exercised irrigation consents was 8,835
ML. This was more than that used during the preceding 2018-2019 monitoring year, when 56 irrigation
consents were exercised, and a total usage of 6,906 ML. …
daily average results fell
into the Ministry's 'excellent' or 'good' categories and 41% of the results met the 'acceptable'
category. Six daily results from the total 138 of days monitored fell into the ‘alert’ category. It
is noted that all of those six results happened during moderate to heavy rainfall events, and
in the majority of cases, during fresh onshore winds. These findings confirm those of the
previous inhalable particulate surveys that found sea salt spray to be a major PM10 source.
Report 2017-2020.
5.2 It was noted that Council would like to increase the number of monitoring bores,
especially within the eastern parts of Taranaki, to improve understanding of areas
where there is limited data and information.
5.3 Water allocation in the region is well within current allocation limits and monitoring
shows that groundwater levels are generally stable, with fluctuations the result of
seasonal rainfall and pumping effects. It was noted that we are already starting to see
boundary – bank erosion
page
i
Table of contents
Page
1. Purpose 1
2. Introduction 1
3. Background 1
3.1 Ring plain 1
3.2 Elevation 2
3.3 Stability 3
3.4 Rainfall 3
3.5 Run off 4
3.6 Channels 4
4. Legal status and background 6
4.1 Ownership 6
4.2 Control 6
4.3 Land ownership 6
4.4 Catchment authorities 7
4.5 Regional Water Boards 7
4.6 Control of gravel extraction 7
5. Geology 8
6. Watercourses 9
7. Event/effect relationship 10
(the Council) to assess the environmental
performance during the period under review, and the results and effects of the consent
holder’s activities.
The Council’s monitoring programme included three regular inspections, one additional
inspection, and two biological receiving water surveys. Three short duration overflows (four
to nine days) following prolonged and intensive rainfall events, occurred between mid April
and late June 2015.
Regular inspections indicated no problems
rainfall sites recorded figures well above their
averages for the three winter months. Our site
at Patea recorded rainfall figures that were 167%
above its average amount for those months, yet
it was still the driest of our 27 rainfall monitoring
sites around the region. Perhaps you could spare
a thought for the people working in the Dawson
Falls area, as a staggering 2,723mls of rain fell at
that site over the winter period.
Congratulations to the 55 schools, 51 early
2018-June 2019) 9
Figure 4 Daily abstraction volumes under consent 7470-1.2 (July 2009-June 2019) 10
Figure 5 Maximum daily abstraction rate under consent 7470-1.2 (July 2009-June 2019) 10
Figure 6 Observed groundwater levels GND2102 and rainfall (July 2018-June 2019) 11
Figure 7 Observed groundwater levels GND2102 and abstraction (July 2018-June 2019) 12
Figure 8 Observed groundwater levels GND2103 and rainfall (July 2018-June 2019) 12
Figure 9 Observed groundwater levels