telemetered to the Council and reviewed for compliance.
During the period under review CCCWSL complied with the normal operational abstraction limit of 69L/s for
99.8% of the time. There was one occasion when CCCWSL was required to use its exceptional use limit of 79
L/s due to the reservoir levels falling below 80%. Figure 2 shows CCCWSL’s abstraction rate for the 2023/24
monitoring period.
Figure 2 CCCWSL abstraction rates for 2023/24
2.1.4 Hydrological monitoring and residual flow
organisms.
Southern Hill Country Freshwater Management Unit Discussion Document
annotation https://www.trc.govt.nz/ https://www.trc.govt.nz/
page
Southern Hill Country Freshwater Management Unit Draft Discussion Document Page | 9
Two sites are monitored for ammonia. Both fall in band A, meaning ammonia is likely to have little to no
effect on all but the most sensitive species. Modelled estimates support monitoring results, with
approximately 82% of streams and
corner, or
south toward swales in the grassed area and then to a settling pond on the southern boundary. Stormwater
from a storage area to the south of the main building is transported across the paddocks to a manhole.
During heavy rain overflow from the settling pond also discharges into a single manhole and enters the
piped tributary.
1 The Council has used these compliance grading criteria for more than 19 years. They align closely
overabundance of algae and aquatic weeds, impact on the
growth of sensitive species, or even become toxic to freshwater organisms.
For ammonia, modelling suggests that all streams fall in band A (92%) or band B (8%) (Figure 4). Ammonia
is expected to have little to no toxic effect on all but the most sensitive species.
For nitrate, around 12% of streams fall within band A and aquatic species are unlikely to experience the
effects of nitrate. The majority of streams fall into band B (88%) (Figure
period was lower than normal in
comparison with historical surveys. The total number of samples falling within the “Alert” or “Action”
categories (40% of samples) across the 16 recognised bathing sites was the highest recorded. However, it
should be noted that the “Action” category is the only category for which swimming is not recommended.
In the 2017-2018 season, 79% of all samples met the national bathing guideline. Of the 21% of samples that
exceeded the guideline, 11% arose
sites are monitored for ammonia. Three
out of four sites fall within band A and one
site in band B. At these sites, ammonia is
likely to have little to no effect on all but the
most sensitive species. Modelled estimates
support the monitored results, with
approximately 68% in band A and 32% in
band B (Figure 4).
Four sites are monitored for nitrate, all of
which fall in band A. At these sites, nitrate is
likely to have little to no effect on aquatic
life. Modelled estimates largely
undertaken on 20 February 2015 38
Table 10 Results of rain event monitoring – discharge and Puremu
Stream samples, 13 August 2014 39
Table 11 Results of rain event monitoring - Manganaha Stream, 13
August 2014 40
Table 12 Biomonitoring sites in the Puremu and Manganaha Streams
related to the Colson Road Landfill. 41
Table 13 Chemical analysis of Colson Road Landfill groundwater
sampled 9 June 2015 44
Table 14 Air deposition monitoring results for 13 January- 4 February
2015 45
overabundance of algae and aquatic weeds,
impact on the growth of sensitive species, or
even become toxic to freshwater organisms.
Five sites are monitored for ammonia, all of
which fall within band A. At these sites, ammonia
is not likely to have any toxic effect, even on the
most sensitive species. Modelling estimates
(Figure 4) however, suggest that around 66% of
rivers or streams are in band A, while 34% are in
band B.
Five sites are monitored for nitrate. One
ponds before land
application. The pond is stirred as effluent is sprayed onto pastures via a travelling rain gun.
There are two storage ponds on the property, pond 1 has a storage capacity of 24,500 m3, and pond 2 has a
storage capacity of 19,320 m3.
The existing piggery, ponds, and irrigation areas in relation to the property are shown in Figure 1, and Figure 2
Figure 1 Location of Stanley Bros Trust Piggeries current buildings and effluent ponds
page
2 …
bunded to contain any stormwater and organic leachate, and exclusion drains, bunds,
and diversions are situated around the ponds to divert clean stormwater away from
operational areas.
74. Stormwater runoff typically occurs immediately following rain events. The stormwater
volume depends on a number of factors, including the moisture content of the soil and
the intensity of the rain. The majority of contaminants contained within the stormwater
will be in the ‘first flush’ of water leaving