Envirosouth June 2012 Environment Southland News
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Brucie’snow Buddies includes bulletin see page 15 Envirosouth June 2012 Environment Southland News Issue RPS released for submissions Environment Award nominees 27 Funding helps to control pests Floodwarning: 64 years of service From the Chair y the time you read this, our this year. The last time we adopted BCouncillors will be about to a 10-year plan we received over 200 consider 148 submissions on our submissions, so 148 could suggest a Draft Long-term Plan. decline in interest, given we distributed over 40,000 copies of the summary to There are some constant themes – residents and ratepayers. Or it could widespread support for our proposal mean that most people support what to make improved water quality our we’re proposing, and don’t feel the need top priority; both support for and to put pen to paper. Either way, it’s been opposition to the proposal to increase a huge job to prepare programmes the dairy differential rate; extensive and budgets for the first three years support for the proposal to create a of the Long-term Plan, involving long new walkway at Titiroa and a mixed hours for staff and several workshops bag of views on whether we should put for Councillors. The current requirement some money into the rebuild of Stadium to plan in such detail for three years Chairman Ali Timms. Southland to enable it to be used as an can probably be justified but having to emergency facility for civil defence. project the requirements and budgets Ali Timms There were also some submissions that over a further seven years seems an Chairman came out of left field, such as the 29 unnecessary burden. Eastern-Dome Constituency requests that we do more to safeguard (03) 248 7222 Each submission will be considered Hector’s and Maui Dolphins. carefully, and everyone who has taken Cover picture: It’s hard to know whether we should the trouble to give us their views will Staff prepare to tow a monitoring be pleased or disappointed at the receive a reply to say what the Council platform out onto Waituna Lagoon. number of submissions we received has decided as a result of what they said. What’s coming up? JUN Long-term Plan adoption Submissions have closed for the Council’s Draft Long-term Plan and it will be adopted later this month. In this 29 10-year plan, efforts to halt and reverse the continuing decline in water quality across the Southland region will get a significant boost in funds and staffing in the next three years. JUL Proposed Regional Policy Statement Submissions are now being welcomed on Southland’s Proposed Regional Policy Statement. The full document 18 is available on our website, www.es.govt.nz where there is also a guide to help you make a submission. Read page 14 for more information. JUL Green Screen Environmental Short Film Awards Entries for the Green Screen Environmental Short Film Awards have now closed and judging is underway. Well 19 done to all those who submitted a film. The gala awards night is being held on Thursday 19 July at Centrestage in Invercargill, so we look forward to seeing all our budding young filmmakers there. JUL Southland Environment Awards Judging of the nominees in this year’s Southland Environment Awards is now complete and it’s just a few more 25 weeks until the awards night reveals the winners. Read more about this year’s nominees on page 13. SEP ShakeOut Civil Defence aims to have one million participants in the New Zealand ShakeOut earthquake drill, the first 26 ShakeOut drill held nationwide in any country! Check out page 12 for more information and details of how to register. Page 2 Buddleja found on the Waiau second crop of Buddleja Buddleja is also known as butterfly bush Biosecurity staff are concerned that this A (pronounced buddlia) has as it attracts lots of butterflies, and is plant has the potential to spread quickly been found on the banks of the a common garden plant throughout and become a problem on a similar Waiau River this season, concerning Southland. Amy says the species they scale to gorse and broom. Biosecurity staff at Environment are concerned about is Buddleja davidii, Southland. which has white or purple flowers in When you’re out fishing on the Waiau January, can grow up to two metres tall River, please keep an eye out for Buddleja, a tall, woody shrub, likes to and has vast amounts of very fine seeds Buddleja and give us a call if you spot inhabit disturbed stony, rocky, gravely (about 3 million on an average plant). this problem plant. ground like river beds and has become a problem in other parts of the country. Biosecurity Officer Amy Lagerstedt says the unusual thing about this find was that it was on the wrong side of the river for seed to have spread with the current or wind. “We’re concerned that there might be more out there that we don’t know about, so would welcome anyone fishing on the Waiau that spots some of this plant to give us a call”. Buddleja has the potential to spread quickly and could become as big a problem as gorse if not controlled on Southland’s river beds. Art competition selects cover he creative talents of three Tyoung Southlanders have helped bring the concepts of the Proposed Regional Policy Statement to life. Sarah Sarfaiti’s pencil drawing of Southland’s environment was chosen to illustrate the cover of the document, which was released for public comment last month. And paintings by fellow Invercargill teenagers Olivia Cousins and Fliss Crossley-Pritchard adorn the back and inside back cover. Their artwork was chosen from over 20 entries in a competition run by Environment Southland earlier this year. Sarah Sarfaiti’s winning artwork. Page 3 Gas in groundwater provides clues for scientists n Environment Southland As a consequence groundwater is sealed and whisked away for laboratory Ascientist and a university student typically higher in radon than surface testing at the University of Canterbury. have been “sniffing” for a radioactive water, so if there’s higher than expected gas to obtain valuable information readings of dissolved radon-222 gas From the moment the radon-222 gas about the influx of groundwater into in the surface water it indicates a is extracted, it starts to deteriorate so Waituna Lagoon. groundwater contribution. haste is imperative to capture a valid result, however the rate of decay is During the past few months “Sniffing” for the gas doesn’t require a factored into the lab testing, he says. Groundwater Scientist Clint Rissmann, keen sense of smell on the scientists’ with the assistance of University of behalf, it is simply the term coined for Clint says the testing regime in the Canterbury PhD student Jonathan the sampling method used to capture Waituna is ongoing and there’s even Davidson, have been taking samples the gas, he says. Samples are gathered scope for the method to be used to from across the Waituna catchment to via a pump and hose - with water help examine surface water quality investigate the presence of the naturally sucked from the bed of the lagoon or across the region in the future. occurring gas, radon-222, possibly a nearby creek - and samples are quickly first in Southland. Clint says the existence of the gas, and the amount of it, can help determine the interaction between groundwater (from aquifers) and surface water in the lagoon and surrounding waterways. He says the work will help confirm work already done to examine the groundwater seepage into the lagoon. “It may also be useful in helping to decipher the origins of nutrients inputs into the (Waituna) lagoon.” He says despite the menacing notion of the gas being radioactive, there was in fact little to worry about. In concentrated doses the gas can be harmful to human health, however the radon-222 that exists in Waituna groundwater is at lower levels and poses no health risk, he says. In fact preliminary findings have shown radon-222 levels between 3000 and 40,000 becquerels (the unit used to measure radioactivity) per cubic metre of water, which Clint says is about one- fifth of the World Health Organisation guidelines for groundwater limits. He says the testing represents a significant step towards better understanding the hydrological relationships in the Waituna catchment. The gas is produced from the decay of radioactive minerals within rocks which University of Canterbury PhD student Jonathan Davidson sampling the radioactive over time is released into groundwater. gas radon-222 from a bore in the Waituna catchment. Page 4 Groundwater studies provide insights into water quality he influence groundwater has on Farmers were very helpful, allowing their also drains rapidly from this area TWaituna’s creeks and lagoon has bores to be sampled numerous times into Waituna Creek and appears been poorly understood until now. A for the programme. to contribute significantly to the technical report covering the results deterioration in the water quality of of a several investigations in the One of the overall key findings was that Waituna Creek, south of Mokotua. Waituna catchment over the past year groundwater plays a relatively minor, Modelling indicates groundwater has just been released and provides but still very important role in the has an average residence time of 1-2 some interesting insights. transport of nutrients to the lagoon. weeks, which is extremely rapid. When compared with estimated surface • In the Southern Zone, recharge The studies were particularly helpful water loads, groundwater inputs may to shallow groundwater systems in understanding the role that contribute approximately 10-18% of the occurs relatively rapidly (hours/days) groundwater plays in terms of water cumulative nitrogen and phosphorus via the soil zone.