07.10.2020 Views

The Star: October 08, 2020

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

Thursday <strong>October</strong> 8 <strong>2020</strong> <strong>The</strong> <strong>Star</strong><br />

WATER QUALITY in most<br />

Christchurch waterways has<br />

remained steady but the majority<br />

are still ranked as ‘poor’, a new<br />

city council report shows.<br />

<strong>The</strong> council has published its<br />

annual Christchurch Surface<br />

Water Quality Report, an analysis<br />

of water quality data collected<br />

throughout last year.<br />

Council waterways ecologist<br />

Dr Belinda Margetts led the<br />

research, and says water quality<br />

in most Christchurch waterways<br />

is unchanged from previous<br />

years.<br />

“<strong>The</strong>re were some improvements<br />

and some declines in water<br />

quality at certain sites, but overall<br />

the quality is much the same<br />

as we’ve seen previously,” said<br />

Margetts.<br />

But improving water quality<br />

is a slow process, she said, as<br />

Christchurch’s waterways suffer<br />

from a condition known as ‘urban<br />

stream syndrome’.<br />

“<strong>The</strong> main contaminants in our<br />

waterways are from waterfowl<br />

droppings, dog poo and stormwater<br />

run-off contaminated with<br />

metals from cars and roofs, and<br />

sediment.<br />

“<strong>The</strong> contaminants of most<br />

concern include nitrogen, phosphorus,<br />

Escherichia coli (an indicator<br />

of faecal contamination that<br />

can cause illness), and dissolved<br />

zinc and copper.”<br />

Waterways are monitored at<br />

42 sites across the district, with<br />

more than 11,000 tests being<br />

conducted.<br />

Of the samples tested, 20 per<br />

cent did not meet quality guideline<br />

levels and 98 percent of sites<br />

did not meet guideline levels for<br />

at least one of the quality factors<br />

measured.<br />

After all the data had been analysed,<br />

each monitoring site was<br />

scored, with most being ‘poor’.<br />

None were ‘very good’ and none<br />

were ‘very poor’.<br />

“<strong>The</strong> catchment with the best<br />

overall water quality was the<br />

Ōtūkaikino River catchment<br />

and the worst was the Ōpawaho-<br />

Heathcote River catchment,” said<br />

Latest Canterbury news at starnews.co.nz<br />

Waterways still rated ‘poor’ – report<br />

QUALITY: <strong>The</strong> Ōtūkaikino River, which runs through <strong>The</strong><br />

Groynes.<br />

PHOTO: NEWSLINE<br />

Margetts.<br />

Of all the sites monitored, the<br />

site with the best score was in<br />

the Pūharakekenui-Styx River at<br />

Main North Rd.<br />

<strong>The</strong> site with the worst score<br />

was in Curletts Rd Stream, with<br />

the next lowest being in the<br />

Ōpawaho-Heathcote River at<br />

Tunnel Rd, Haytons Stream and<br />

the Ōpawaho-Heathcote River at<br />

Ferrymead Bridge.<br />

Margetts says the priority areas<br />

for improving water quality are<br />

the Haytons and Curletts Rd<br />

streams and middle tributaries of<br />

the Ōtākaro-Avon River catchment<br />

– Riccarton Main Drain,<br />

Addington Brook and Dudley<br />

Creek.<br />

<strong>The</strong> council also produces<br />

annual waterway report cards,<br />

which combine these water quality<br />

results with other ecological<br />

data.<br />

<strong>The</strong> overall score for the<br />

Ōtūkaikino River catchment was<br />

B (good) and the Pūharakekenui-<br />

Styx River catchment was C (fair).<br />

<strong>The</strong> Ōtākaro-Avon River, Huritini-Halswell<br />

River and Ōpawaho-<br />

Heathcote River catchments all<br />

scored D (poor).<br />

In spite of there being room for<br />

improvement, Margetts says the<br />

city’s waterways, especially the<br />

more rural waterways of Banks<br />

Peninsula, are home to many<br />

threatened species.<br />

Some of these species were<br />

gathered by Māori as mahinga<br />

kai (food), including wai kōura<br />

(freshwater crayfish), kākahi<br />

(freshwater mussels), tuna (longfin<br />

eel) and inanga (a whitebait<br />

species).<br />

“Christchurch waterways<br />

contain many spawning sites<br />

for inanga, pockets of kākahi in<br />

large numbers, and one of the few<br />

known spawning sites for kanakana<br />

(lamprey),” says Margetts.<br />

“<strong>The</strong> important thing is to<br />

make sure our waterways don’t<br />

decline further and that everything<br />

possible is done to protect<br />

and improve them so that these<br />

and other species can continue to<br />

thrive.”<br />

NEWS 19<br />

Wastewater<br />

discharge views<br />

to be discussed<br />

OPTIONS ON how Akaroa’s<br />

wastewater should be discharged<br />

are being mulled over next week.<br />

<strong>The</strong> Akaroa Treated Wastewater<br />

Options Hearings Panel will<br />

start hearing oral submissions<br />

on Monday.<br />

<strong>The</strong> city council sought submissions<br />

on the project over four<br />

weeks in July and August.<br />

Four options for dealing with<br />

highly treated wastewater from<br />

Akaroa were presented for feedback<br />

– three where the treated<br />

wastewater would be used to<br />

irrigate new areas of native<br />

trees and one where it would be<br />

piped out into the mid-harbour<br />

through a new outfall.<br />

At the close of consultation<br />

341 submissions had been received<br />

from individuals, organisations<br />

and businesses, with 83<br />

asking to speak at the hearings.<br />

Submitters were asked five<br />

questions.<br />

<strong>The</strong> two most pertinent<br />

were whether they favoured<br />

highly treated wastewater being<br />

discharged to land or to the<br />

harbour, and then, if the mayor<br />

and councillors decide it should<br />

go to land, which of three<br />

locations would the submitter<br />

prefer – Inner Bays (Robinsons<br />

Bay, Takamātua and Hammond<br />

Point), Goughs Bay, or Pompeys<br />

Pillar.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!