Water Plan the water take would be 2/3 MALF approximately
737l/s, but due to mitigating circumstances, due to sand/sediment loading the Opunake lake may be
a more beneficial food producing habitat for trout and other species than the river.
The HEP scheme has been operating with a residual flow of 180 l/s for 12 Years. Scientific studies of
the available in stream habitat make recommendations that 180 l/s is suffice to support native fish
and brown trout life at 15% food producing
average injection pressures are not required under consent 7897-1
Figure 5 Kaimiro-11 well: Daily injection volumes and injection pressures (2022-2023)
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Daily volume (m³) Pressure limit (115 bar) Maximum wellhead injection pressure (bar)
page
19
2.4.4 Summary of injection activities at the
Issued for Review Page 3 Date - May 2018 Rev3
The lake provides intra-day storage under an operating regime of 400mm over the
approximately twelve hectares of lake.
The weir is designed to divert most of the flow of the Waiaua River, for 75% of the time and to
overtop only at higher flows (35% of the time, noted 2016-2017 records). A residual flow of
180 litres per second is maintained in the river below the weir via a new fish pass constructed
in January 1997 and sand trap canal Sluice
Coastal Marine Area 17
6. Submissions 19
7. Pre hearing meetings 23
7.1 First Pre hearing meeting 23
7.1.1 General meeting discussion 23
7.1.2 Outcomes of the meeting 24
7.2 Second Pre hearing meeting 24
7.2.1 General meeting discussion 24
7.2.2 Outcomes of the meeting 24
7.3 Third Pre-hearing meeting 25
7.3.1 Draft consent conditions 25
7.3.2 Withdrawal of submissions 25
8. Assessment of environmental effects 25
8.1 Hydrological effects 26
8.2 Minimum flow 26
8.2.1 Ecological values supported at 180
NPDC Colson Road Landfill Annual Report 2022-2023
Unit 183458 191620 192969 194424
pH pH 8.2 8.2 8.2 8.2
Total alkalinity g/m3 CaCO3 148 148 150 148
Bicarbonate g/m3 HCO3 178 177 180 177
Total hardness g/m3 CaCO3 84 83 84 93
Electrical conductivity mS/m 31.3 32.2 31.8 30.6
Total dissolved solids g/m3 180 182 169 175
Dissolved calcium g/m3 19.4 20 21 21
Chloride g/m3 12.0 11.6 11.7 11.8
Dissolved magnesium g/m3 8.7 7.9 8.0 9.5
Dissolved potassium g/m3 3.1 3.1 3.0 3.2
Dissolved sodium g/m3 33 32 33 34
Egmont Ntnl Park (North) 14 728.0 174 1223.5 100 17 Nov 1990
Dawson Falls Ntnl Park (South) 15 567.0 153 1174.5 114 20 Feb 1933
Kahui Hut Ntnl Park (West) 15 457.5 145 877.0 99 17 Nov 2005
Mangorei Upper Near bushline 15 497.5 - 801.0 - - Feb 2017
Hillsborough 13 247.0 174 428.5 127 24 Feb 2012
Brooklands New Plymouth 13 193.8 148 346.6 113 22 Jan 1872
Mangati Bell Block 13 187.8 180 349.2 127 24 Oct 2012
Weston's Farm Motunui 10 212.0 212 410.6 144 26 Feb 1998
me in summer months when the power
station was operating that the residual flow of 180 litres/second
was too low to maintain water quality. In the hottest months of
summer fish kills have been observed in the lower river due to
high water temperatures and low oxygen levels I suspect. I
rarely fish the lower river in summer because of this. I
personally think that the residual flow for the lower river needs
to be at least double the 180 litre/second rate and probably
closer to 400 litres per
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
@ 20°C
(mS/m)
Bacteria
Temperature
(°C)
E . coli
(cfu/100ml)
Enterococci
(cfu/100ml)
Faecal
coliforms
(cfu/100ml)
05 Nov 2013 10:20 2840 430 180 430 16.1
18 Nov 2013 09:15 4330 8 7 8 17.3
16 Dec 2013 09:05 4270 20 3 20 19.8
16 Jan 2014 09:30 4520 360 25 360 17.8
20 Jan 2014 11:05 4150 46 17 46 17.4
30 Jan 2014 09:05 4540 51 220 51 17.2
03 Feb 2014 11:10 4700 <1 11 <1 18.3
17 Feb 2014 10:00 4610 3 4 3 17.5
20 Feb 2014