no evidence of damage to the
cap. There were no cattle visible during the inspection. The perimeter drains contained flowing water that
was clear. Some surface water was present in the drain near the flume shed, but this was not discharging
towards the Pātea River.
30 March 2023
The site was inspected in fine weather conditions following a rainfall event the previous day. Generally the
overall site was in good condition, however, there was ponding around a central trough and four
boundary – bank erosion
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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
Figure 2 Daily hours where DO is greater than 0 g/m3 in Pond 1 and 2 9
Figure 3 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 (2020-2021) 13
Figure 4 Location of intertidal survey sites in relation to the outfall 14
Figure 5 Mean number of species per quadrat for spring surveys (1992-2020) 15
Figure 6 Mean Shannon-Weiner indices per quadrat for spring surveys (1992-2020) 15
(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
“Therefore the calculations provided by RNZ
are extremely conservative, if not a completely unrealistic assessment of
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10
the effects of nitrogen”. In the defence of using the 225 g/m3 concentration
I make the following points:
A) The amount a nitrogen applied to the irrigation fields is a
combination of the nitrogen concentration in the irrigation pond and
the volume of fluid irrigated. In summer there is less rainfall and
the evaporation from the pond
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
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
How do I identify Critical Source Areas?
Look for areas where water accumulates during rainfall events and which also
connect to water bodies. These are Critical Source Areas. These areas can be
on steep or shallow slopes. If you are unsure, talk to your council or farm
advisor. See the next page for some examples of Critical Source Areas.
Am I allowed to graze stock in Critical Source Areas?
From 1 May to 30 September, stock cannot be grazed in Critical Source Areas
within a winter
during the year (four relating to high
rainfall, and one relating to a potable water leak). All of these incidents were deemed compliant with
consent conditions upon further investigation. There were also 19 wastewater incidents that occurred
throughout the wider wastewater network; 12 of which were related to high rainfall that occurred in
November and December in 2020. One incident occurred when a contractor left a pipe plug in the sewer
following maintenance, which resulted in an overflow
Daily abstraction volumes under consent 7470-1.2 (July 2009-June 2018) 10
Figure 5 Maximum daily abstraction rate under consent 7470-1.2 (July 2009-June 2018) 10
Figure 6 Observed groundwater levels GND2102 and rainfall (July 2017-June 2018) 11
Figure 7 Observed groundwater levels GND2102 and abstraction (July 2017-June 2018) 12
Figure 8 Observed groundwater levels GND2103 and rainfall (July 2017-June 2018) 12
Figure 9 Observed groundwater levels GND2103 and abstraction (July