(1980 to
date) and average MCI values predicted from the MCI – site altitude regression equation
revealed areas on the ring plain where observed stream health is better, worse, or equal to that
which is predicted. This analysis suggested that approximately 65.3% of the area met or
exceeded the stream health predicted by the MCI – altitude relationship, with the remaining
34.7% falling just one quality class below that predicted.
Given the intensity of land-use on the
Much of the scheme is monitored and operated remotely by the Company. Through an automated water
level sensor system, the Company can monitor the residual flows in the Manganui River and Mangaotea
Stream, water levels in the race and lake and how much rain is falling locally. This has allowed the Company
to manage race flows to minimise flooding, and has greatly improved the Company’s compliance with
residual flow requirements.
Resource consents
The Company holds 24 resource consents,
Waitotara. The remainder or irrigators are
generally located inland, between Inglewood and Eltham.
1.1.7 Irrigation systems
In general there are two types of irrigation methods; surface and pressurised. The majority of irrigation
systems currently in operation in the province fall in to the pressurised category. Pressurised systems can be
further differentiated based on the method of operation and equipment used. A summary of the systems
encountered in the region is given below.
K-line and
irrigation methods; surface and pressurised. The majority of irrigation
systems currently in operation in the province fall in to the pressurised category. Pressurised systems can be
further differentiated based on the method of operation and equipment used. A summary of the systems
encountered in the region is given below.
K-line and long-lateral types – Impact sprinklers mounted on moveable laterals (Photo 1)
These are the most common systems found in the region, as they are a low cost
creation of stable interlocked layers of green waste ensures that it does not fall off, or get
blown off the cliffs and down onto the coastal marine area or into the sea.
From observations made during the inspection of the site no adverse environmental effects were found, or
were expected to have been occurring, as a result of the activity authorised by consent 7374-1.4.
3.3 Evaluation of performance
A tabular summary of the consent holder’s compliance record for the year under review is
extended-duration
nuisance blooms reflecting high nutrient
enrichment and/or significant alteration
of the natural flow regime or habitat.
* The productive class is defined by River Environment Classification (REC) types, with a combination of dry climate categories
and soft-sedimentary, volcanic acidic and volcanic basic geology. All sites that do not fall in these categories are in the default
class.
1.3 Periphyton
Periphyton is the ‘slime’ and algae found on the beds of lakes and rivers. This
2.4 Irrigation to Land of Leachate
Situated north of the compost and vermiculture operations is a series of leachate ponds that collects
run-off from these activities. In addition to the collection of leachate and stormwater that falls in the
composting area, wash down water from the truck wash is also collected in this pond; which further
dilutes the compost leachate.
Figure 2 highlights the area in purple, where water from these ponds are irrigated to land. Typically
irrigation
NPDC coastal structures consent monitoring report 2018-2019
into the process sewers which flow to the
storm pond. The stormwater falling on the non-process areas of the western half of the site (Figure 1) is
directed by “v” ditches running alongside the roads to a dam/pond and then out to the Tasman Sea via the
Manu Stream. Stormwater falling on the eastern side of the site is directed to unnamed tributaries of the
Waihi Stream via outfalls and a small sedimentation pond.
Sludge from the storm pond, off-spec pond and blow down pond stored in lagoons
potential to be contaminated, drains into the
stormwater pond under gravity and is then pumped to the effluent treatment plant and discharged via the
marine outfall. Stormwater from the tankage area is pumped over into the process sewers which flow to the
storm pond. The stormwater falling on the non-process areas of the western half of the site (Figure 1) is
directed by “v” ditches running alongside the roads to a dam/pond and then out to the Tasman Sea via the
Manu Stream. Stormwater falling on