figure of 43mm of
rainfall per hour will be utilised. This is a very conservative figure as values for the top 30 rain
occurrences range from 8.0 to 15mm with the average being 9.4mm (refer Table 2).
Runoff of the falling rain will be influenced by the site’s runoff coefficient. This has been calculated
to be 0.25 as per MBIE Verification Method E1/VM1 (1 January 2017). Remediation (NZ) Ltd
considers this coefficient to be a conservative runoff coefficient as the composting
figure
of 43mm of rainfall per hour will be utilised. This is a very conservative figure as values for the top 30
rain occurrences range from 8.0 to 15mm with the average being 9.4mm (refer Table 2).
Runoff of the falling rain will be influenced by the site’s runoff coefficient. This has been calculated
to be 0.25 as per MBIE Verification Method E1/VM1 (1 January 2017). Remediation (NZ) Ltd
considers this coefficient to be a conservative runoff coefficient as the composting
SDC Stratford WWTP Annual Report 2021-2022
signage at the site. There had also been issues with the application of the suppressant, with volumes initially falling short of what was required. The landowner blamed procurement problems. “Even if land is not being used, the owner has a duty to be aware of any potential off-site effects and take action to mitigate them,” says the Council’s Director-Resource Management, Fred McLay. “There’s no excuse for ignoring your environmental responsibilities. That’s the message in this fine.” Read the full
Stratford DC wastewater treatment plant consent monitoring 2019-2020
main method of effluent application, depths applied (~3 mm)
2. ‘Weta’ travelling rain gun – used to apply effluent to the Sand Dune block at 8-10 mm depths during
7 months of the year.
2.3.2.4 Type of crops grown
Two crops were grown under the cut and carry system in 2022-2023. Maize Silage paddocks (37.2 ha) which
were cultivated in October and harvested in March, yielding around 21.3 tonnes DM/ha.
An annual Ryegrass was planted as a crop cover over the cooler and wetter months.
was potentially leaking, staff advised that this would be investigated in summer.
Ngatoro G: the ring drain had been redefined and metal placed alongside it to help filter sediment.
Kaimiro Production Station and Ngatoro-A: Heavy, persistent rain and strong winds had proceeded the
inspection and it was noted that the stormwater system on both sites was working well. All stormwater was
being collected and directed for treatment prior to discharge from the site. The sites were tidy and
being undertaken to reduce the footprint of the pad. This would greatly reduce the volume of stormwater
collected within the pad. Consequently there would be less pumping to the wetland treatment system and
therefore, generally an increase of retention time within the treatment system. RNZ were instructed to
ensure that uncontaminated storm water runoff was unable to enter the paunch pad, so that only the rain
that falls into the pond is required to be pumped through the wetland treatment
4. Company to isolate washwater
from stormwater unless due to
heavy rain events
Inspections of treatment site Yes
5. Location of discharge point Inspections of treatment system and discharge
point Yes
6. Company to adopt best
practicable option
Inspections of treatment system and discharge
point, liaison with Council, sampling of
discharge and receiving waters
Yes
7. Limits quarry catchment area Inspections Yes
page
15
Purpose: To discharge
Waitaha Catchment Annual Report 2020-2021