probably the
main contributing factor to the high cyanobacteria levels. Exposed mats were caused by
falling water levels during this long dry summer and/or the result of daily fluctuations in
river flow caused by periodic releases of hydro scheme waters. Significant detaching or
detached mats were often coincident with high levels of cyanobacteria present in the river.
As a consequence of the presence of exposed and/or detaching mats, signage was erected at
three sites advising recreational river
trunk sewer.
This chamber provided for splitting of the raw sewage influent to flow into either, or
both ponds, but this provision was only intended for utilisation when excessive
stormwater infiltration may have caused an overflow directly to the second pond. The
final outfall (from the second pond) was to the Patea River. However, the connection
between the two ponds and the outlet to the river were originally positioned directly
opposite each other, thereby having the potential to
vi
Figure 5 E. coli numbers for Lake Rotomanu for the 20 sample
extended survey 12
Figure 6 River flow in the Waiwhakaiho River during the survey
period (NOTE: Waiwhakaiho at Egmont Village Flow is
unaudited data) 15
Figure 7 E. coli numbers for the Waiwhakaiho River at Merrilands
Domain during the regular survey season 16
Figure 8 Box and whisker plots for all summer SEM surveys of E.coli bacteria
numbers in the Waiwhakaiho River at Merrilands Domain 17
Figure 9
Stream is less than 800 L/s, the rate of taking from the
Tawhiti Stream shall not exceed 184 L/s, unless the turbidity of the Tangahoe River at the take site is greater
than 850 NTU, and then the rate shall not exceed 347 L/s.
In 2019-2020, the Tawhiti abstraction rate did not exceed 184 L/s at any time that the stream flow rate was
less than 800 L/s. The maximum abstraction rate that occurred when the stream flow was below 800 L/s, was
171.7 L/s. The actual stream flow at this time was 795 …
6
Figure 2 E. coli numbers for Lake Rotomanu during the regular
season 11
Figure 3 Box and whisker plots for all summer SEM surveys of E. coli
bacteria numbers at Lake Rotomanu 13
page
viii
Figure 4 LOWESS trend plot of median E. coli numbers (per 100ml)
at Lake Rotomanu for the 1996-2014 period 13
Figure 5 E. coli numbers for Lake Rotomanu for the 20 sample
extended survey 14
Figure 6 River flow in the Waiwhakaiho River during the survey
period 17
scientific and amenity values
Ecology (e.g. river and lake habitat, vegetation, fish and fisheries, wildlife)
River flow
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power generation. My application relates to the application to
allow only 180 litres of water per second to flow into the river
system below the weir (dam) located near S.H.45. Having
observed the lower 2km of the Waiaua river for over 60 years
from times of no residual flow, the 100 litres flow, the 180 litres
of flow and since June 2018 of the full flow. This stretch of the
river system now appears to be an alive, vibrant and fully
functioning river. From these observations I would conclude
that
reinforce Te Atiawa tribal identity.
Papamoa (being Meeting of the Waters Scenic Reserve)
(as shown on deed plan OTS-043-15)
Papamoa is located on the banks of the Waiwakaiho River in the rohe of Ngati Te Whiti. The site is above a
river bend which was later named the meeting of the waters because of the turbulent river flow at that point.
The site was named Papamoa because the land around which it was located was as soft as a garden bed.
Papamoa was also a nohoanga, a
downstream of the oxidation ponds, and of the effluent from the
oxidation ponds during late autumn under relatively low river flow conditions. This
survey was delayed due to no discharge from the system under very dry late summer-
autumn conditions. The sampling sites are shown in Figure 2 (Section 3) of this report.
The samples were analysed for temperature, pH, conductivity, chloride, dissolved
oxygen, total and filtered uninhibited biochemical oxygen demand, turbidity,
suspended solids, dissolved
concentration
measured downstream compared to that upstream of the
plant’s discharge (24% increase in faecal coliform
concentration).
The downstream concentrations are still well within the
National Objective Framework bottom line value of
1,000 cfu/100mL.
Visual Appearance There is some discolouration in the Patea River beyond the
permitted mixing zone (50 m) of the plant’s discharge. This
is most likely a result of the potential algae solids in the
discharge and low flow conditions.