climate, with abundant rainfall and high sunshine hours, makes the region lush, green
and fertile.
Rainfall
Annual rainfall varies throughout the region. Some coastal areas receive less than 1,400 mm annually, while
the summit of Mount Taranaki receives around 7,500 mm.
Heavy rainfall events do occur and there can be extremes. In 2012 heavy rain caused a number of slips on
the coastal road around Mount Taranaki, including a large slip at Oākura that covered the road, burying a
simulation model, developed by CSIRO,
Australia. The value of pasture ($/kg-DM) was estimated using local farm parameters
that were developed in consultation with Louise Hofmann, Taranaki FarmWise
consultant. The results of that work showed that the values of pasture in the area range
between $0.17 to $0.25/kg-DM, with an average value of $0.22/kg-DM.
Based on these values the irrigation marginal benefits were calculated for a range of
rainfall and soil combinations for three values of pasture:
monitoring year, with most
commencing irrigation in November or December and concluding in February. Rainfall recorded at the
Council’s monitoring locations over the summer irrigation period ranged between 55 % and 111% of
historical mean values. A particularly dry November and December lead to a drought being declared in
Taranaki during 23 December 2017. As a result, irrigation water demand was high during the 2017-2018
irrigation season, with a total water use across all exercised irrigation
Figure 40 Average rainfall data for Taranaki, November 2018 to April 2019 49
Figure 41 Box and whisker plots of enterococci and specific conductivity at all sites during the 2018-
2019 season (SEM data only) 52
List of photos
Photo 1 Onaero Beach 11
Photo 2 Waitara East Beach 14
Photo 3 Waitara West Beach 17
Photo 4 Fitzroy Beach 20
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Photo 5 East End Beach 23
Photo 6 Ngamotu Beach 26
Photo 7 Back Beach 29
Photo 8 Oakura
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
moderate
elevations 28
Figure 14 Groundwater elevations GND2691, GND2692 and 2693-located south east of the site at higher
altitudes 29
Figure 15 Groundwater elevations GND2700, GND2701 and GND2703-located centrally at the site at
moderate altitude 30
Figure 16 Groundwater elevations in the deep bore GND0599 in comparison to rainfall 31
Figure 17 Groundwater elevations in the shallow bores GND2702 and GND0600 in comparison to
rainfall 32
Figure 18 Groundwater elevations in
there will always be a delay
between sample collection, analysis, receiving results and
delivering the public health advice. This is primarily because
bacteria need time to grow in the lab as part of the analytical
process. While we can try to minimise the time between
sample collection and delivery of the information, there will
always be a delay.
By collecting all-weather water quality data, it may be
possible to develop a predictive rainfall risk model, which can
............................................................................................................................. 10
APPENDIX A MONITORING WELLS- REMEDIATION NEW ZEALAND- URUTI .......... 11
APPENDIX B MONITORING BORE INSTALLATION .................................................... 13
APPENDIX C SOIL MOISTURE AND RAINFALL RECHARGE ON CHLORIDE
CONCENTRATIONS IN GROUNDWATER ............................................. 15
APPENDIX D PRELIMINARY UNCONFIRMED CONCEPTUAL SITE MODEL ............... 1
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Commercial in confidence
TABLES
Table 2.1:Haehanga Catchment
improvements. Rainfall in Taranaki does expedite run-off of E. coli and other contaminants
into waterways however, an assessment of earlier ‘dry-weather’ swim spot monitoring data
found that 11 out of 16 sites were still failing the minimum standard, indicating direct
contamination of waterways is a significant issue.
Ordinary Council - Update on changes to NPSFM and policy development programme
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b. Sediment – eight of the 22 (36%) monitoring sites fall below the