Kaihihi Road and SH45. It is clear from the topography of the
overflow area that this has occurred many times in the distant past.
Whilst these overflows are uncommon, with large volumes of gravel being transported by
the Stony River from its upper reaches and increases in rainfall arising from the effects of
climate change, they are likely to occur more regularly in the future.
Works required to reduce the risk of overflows causing future damage to the area were
undertaken as capital works
Kaihihi Road and SH45. It is clear from the topography of the
overflow area that this has occurred many times in the distant past.
Whilst these overflows are uncommon, with large volumes of gravel being transported by
the Stony River from its upper reaches and increases in rainfall arising from the effects of
climate change, they are likely to occur more regularly in the future.
Works required to reduce the risk of overflows causing future damage to the area were
undertaken as capital works
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
Operations and Regulatory Commiittee Agenda July 2024
significant rainfall
events.
13. The Company continues to be proactive in their response to objectionable odour identification, with
areas of the main storage shed closed to prevent odour release. Mesh doors that were installed during
the 2020/21 period continue to prevent mass air movement from within the shed. The Company also
maintains shelter belts/vegetative environmental buffers (VEBs), as a passive odour mitigation
technique. These buffers continue to establish and mature.
to be maintained in the Patea River
downstream of the dam, and allows for a lower minimum flow when less than normal
rainfall reduces inflows.
Conditions 9 to 12 define the minimum and maximum allowable lake levels for winter
and summer periods, specify the required spillway gate settings during a high lake
level, and allows for some flexibility in lake levels to allow for a short term electricity
shortage. When such a shortage occurs, the consent holder is required to notify
Council,
data were sorted into arrays for each individual year, and then ranked from the highest to
lowest values. After discarding the highest 5 (1) percent of the ranked values for each year
the next highest values for each year are the 95th (99th) percentiles
In this report the 95th (99th) percentiles of daily maximum gust speed will be called the
‘extreme intensity’. The frequency of daily maximum gust speed exceeding the 1972-2006
mean 95th percentile rainfall values will be called the
climate change out to 2100, would use an increase in peak flood flows of
approximately 20%. This is based on the latest NIWA report prepared for MfE (HIRDs V4). That report states for every
degree of temperature increase there is a corresponding 10.1% increase in rainfall (this is called the augmentation factor).
Using the RCP6 climate change scenario out to 2100 (the mid-range CO2 emission scenario) this gives a 2.0-degree
temperature increase or an equivalent increase in rainfall
undertaken within three days following significant river
freshes. However, occasionally sampling was affected by localized rainfall and
elevated river flows. An additional seven samples were taken at five of the beaches
(Onaero, Fitzroy Ngamotu, Oakura and Opunake) regardless of weather conditions for
the purpose of MfE monitoring (as discussed in Section 3.3.1). All results within this
report are presented and discussed on a site-by-site basis for the sampling period. The
timing of high tide on
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 sediment control
structures;
g) Procedures and timing