and reduces the amount of contaminated water you need to manage.
Monitor and maintain your runoff control measures. Reassess and adjust if necessary. Consent requirements
You won’t need a resource consent to discharge stormwater to land or to water if you can meet these requirements: The discharge is not into a significant wetland.
You have a stormwater interception system (a roof and guttering, for example) to keep rain from areas where there may be contaminants, if your site is bigger than half
There was relief for drought-hit Taranaki last month with an average of 177.2mm - that's 20% more rainfall than usual for the region. Rainfall ranged from 29% less rain than usual at Waitotara at Rimunui Station, and 107% more than normal at Mangorei Upper at Forest Hill. Year-to-date rainfall is lowest at Waitotara at Hawken Rd with 45% less rainfall than normal, Mangorei Upper at Forest Hill has had the highest year-to-date rainfall with 6% less than normal. On average year-to-date rainfall
to date totals for rain gauge sites in Taranaki.
December Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 15 366.5 61.6 5888.4 85.1 85.1 1995
Dawson Falls 14 282.5 58.5 5569.0 87.0 87.0 1999
Kapoaiaia at Kahui
Hut 15 340.0 86.5 4603.5 87.5 87.5 2006
Mangorei Upper at
Forest Hill 14 258.0 67.9
page
Table 1: Rainfall January and year-to-date totals for rain gauge sites in Taranaki.
January Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 9 179.0 49.5 179.0 49.5 2.6 1995
Dawson Falls 12 183.0 53.9 183.0 53.9 2.9 1999
Kapoaiaia at Kahui
Hut 10 173.0 58.5 173.0 58.5 3.3 2006
Mangorei Upper
year-to-date totals for rain gauge sites in Taranaki.
November Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 14 570.5 118.7 5519.4 87.3 79.8 1995
Dawson Falls 13 461.0 105.2 5286.0 89.4 82.6 1999
Kapoaiaia at Kahui
Hut 17 394.5 93.6 4263.0 87.6 81.1 2006
Mangorei Upper at
Forest Hill 13 305.5 97.3
rain gauge sites in Taranaki.
October Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 19 625.5 85.4 4948.9 84.7 71.6 1995
Dawson Falls 17 569.5 100.4 4825.0 88.1 75.4 1999
Kapoaiaia at Kahui
Hut 21 490.5 102.4 3868.5 87.0 73.6 2006
Mangorei Upper at
Forest Hill 18 250.5 80.6 2469.0 80.8 65.8
year-to-date totals for rain gauge sites in Taranaki.
July Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 17 592.5 84.8 2774.5 73.6 39.9 1991
Dawson Falls 19 672.5 109.2 2821.0 83.3 47.4 1933
Kapoaiaia at Kahui
Hut 20 356.0 61.7 2279.0 77.8 43.4 2006
Mangorei Upper at
Forest Hill 17 257.0 63.3 1493.5
The weather stats are in for 2024 and if you live near Hawken Road in South Taranaki then last year you will have enjoyed the lowest rainfall and highest air temperature in the region. And those living near Ngutuwera, north of Waitotara, had to hang onto their hats on 4 February as the area recorded the highest wind gust for the year at 128.52km/hr. Figures from Taranaki Regional Council show the region, well known for enjoying a healthy dose of rain most years, recorded 14% less than normal
METHODOLOGY
3.1 Modelling Approach
The hydraulic model prepared for this study utilised a linked 2D version of the TUFLOW HPC (Heavily
Parallelised Compute) model. For this flood study, a Direct Rainfall (also known as Rain on Grid) modelling
approach has been utilised; rainfall data inputs with model losses defined based on catchment surface
characteristics generate surface runoff, which is then hydraulically routed through the model topography. More
detail on the modelling
Rainfall September and year-to-date totals for rain gauge sites in Taranaki.
September Year to Date
Rain gauge # days
with rain
Total
rain
(mm)
% of
typical
month
Total to
date (mm)
% of typical
year to date
% of typical
full year
Records
Began
North Egmont at
Visitors Centre 23 492.7 73.5 4323.4 84.6 62.5 1995
Dawson Falls 24 483.5 76.1 4255.5 86.7 66.5 1999
Kapoaiaia at Kahui
Hut 25 452.0 89.8 3378.0 85.2 64.2 2006
Mangorei Upper at