contributing waterways drain off the high, steep, unstable slopes of
Mount Taranaki and are capable of transporting large amounts of coarse sediment as bed load, as
well as fine sediment (TRC, 2011). Additionally, the orographic influence of Mount Taranaki results in
high local rainfall and attracts high intensity rainfall events in the headwaters of rivers originating on
the Maunga. This means sediment transport rates, and the frequency of sediment transport events,
are likely to be relatively high in the
effective precipitation >1500mm;
50% of the cumulative rainfall volume fell between 400m and 1000m;
volcanic acidic dominant geology, and pastoral land cover.
and under-represent catchments with:
mean annual temperature ≥12°C;
mean annual effective precipitation <500mm and ≥1500mm;
50% of the cumulative rainfall volume fell above 1000m;
alluvium and soft-sedimentary dominant geology, urban, scrub, exotic and indigenous forest land
cover.
At a local
is owned by
the Company, and consists of steep eroded hillsides, multiple side gullies, and small river flats distributed
along its length. The area receives more rainfall than the northern Taranaki coastline to the south-west. Soils
are generally poor and highly erodible. Patches of bush and planted trees cover most of the hillsides, with
grasses over the remainder and the flats.
1.3 Process description
The Company’s operations include composting, quarrying and vermiculture operations
at the same four sites
(Waingongoro River at Ohawe, Kaupokonui River at the mouth, and Waiwhakaiho River at the last riffle and
at Merrilands Domain) on a total of 13 surveys. Levels of cyanobacteria were higher than in the previous two
seasons, but lower than the preceding two seasons, probably a reflection of the relative amounts of rainfall
causing freshes that scour streambeds of periphyton.
Timely reporting of the results of bacteriological water quality and
potassium, sulphur,
calcium, magnesium and sodium. This report focuses on the nitrogen loading and losses from the site.
Nitrogen enters the Irrigation Area through the irrigated liquid, rainfall and clover fixation.
Nitrogen leaves the Irrigation Area by being leached below the root zone, by volatilisation and denitrification to
the atmosphere and in the harvested pasture in the form of baleage.
Nitrogen moves between the organic and inorganic pools within the soil. Generally, nitrogen in
............................................................................................................................. 10
APPENDIX A MONITORING WELLS- REMEDIATION NEW ZEALAND- URUTI .......... 11
APPENDIX B MONITORING BORE INSTALLATION .................................................... 13
APPENDIX C SOIL MOISTURE AND RAINFALL RECHARGE ON CHLORIDE
CONCENTRATIONS IN GROUNDWATER ............................................. 15
APPENDIX D PRELIMINARY UNCONFIRMED CONCEPTUAL SITE MODEL ............... 1
page
Commercial in confidence
TABLES
Table 2.1:Haehanga Catchment
investigations, and interventions summary table 20
Table 10 Summary of performance for consent 5079-2 23
Table 11 Summary of performance for consent 7520-1 24
Table 12 Evaluation of environmental performance over time 25
List of figures
Figure 1 Configuration of the HWWTP (adapted from NIWA, 2012) 4
Figure 2 Daily hours where DO is greater than 0 g/m3 in Pond 1 and 2 8
Figure 3 Daily discharge volumes (m3/day) from the HWWTP and daily rainfall data (mm) from a
Council rainfall …
pipeline renewals
• $891 spent on CCTV.
The expenditure for pipeline renewals was entirely on project management, investigation and design. No
construction occurred.
A wastewater network modelling project is underway which uses rainfall and flow data to create a calibrated
digital model of the entire Inglewood wastewater network. The calibrated model will be used to assess
network performance under different storm events of varying duration and return interval, along with
projected
Agenda Operations Regulatory Committee 22 Nov 2022
occur in heavy rainfall events. These flood flows spill overland but generally rejoin the main
channels before they enter the urban area. These overland flows will generally be caught by
the diversion channels which cut across the lay of land.
1.9 Climate
Because of its exposure to disturbed weather systems from the Tasman Sea, the Taranaki
region is often quite windy, but has few climate extremes. The most settled weather occurs
during summer and early autumn.
The mountain and