Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Water storage lake to be drained

Water storage lake to be drained

Greater Wellington Regional Council has this week begun draining one of its water storage lakes, in an effort to remove an organic compound, recently found at higher than normal levels in the lakes.

The naturally occurring compound, known as Geosmin, can cause water to taste and smell ‘earthy’. Geosmin poses no health risk and the water remains safe to drink.

Lake water with normal levels of Geosmin is routinely treated at the Te Marua Water Treatment Plant using powdered activated carbon (PAC). However due to the exceptionally high levels in Lake 2 in recent weeks, not all of this taste and odour causing compound can be removed from its water. The level of Geosmin in Lake 1 is presently normal, which means that the PAC treatment is able to effectively remove the Geosmin.

Because storage lake water is only used as a back-up water source when river water is unavailable (for example, after heavy rainfall when river water is too dirty to treat) and water from Lake 1 is able to be used, regional council officers have made the decision to drain Lake 2 and refill it with fresh water.

Greater Wellington Regional Council Water Supply General Manager Chris Laidlow says that while all water being supplied to the public remains completely safe to drink, it made sense to drain the lake.

“When we’re using water from the storage lakes – which isn’t often – organic compounds such as Geosmin are removed using PAC. While that process sometimes doesn’t remove all of the compounds from our water, it is completely safe and complies with the NZ Drinking-water Standards.

“We decided this week that it is better to drain Lake 2 rather than continue to try and treat the high levels of Geosmin. Now is a reasonable time to empty the lake as there is a very low risk of a water shortage at this time of year and we have plenty of time to refill the lake before next summer.

“We don’t yet know the cause of the high levels of Geosmin but we’re looking into this and also methods for dealing with high levels of Geosmin in the future.”

Lake 2 is the southern of the two lakes and holds 2,067 million litres of water. It will be empty by 20 May and is expected to take 6-8 weeks to refill.

Ends

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Agreements Signed:
PM Meets With Chinese President

Prime Minister John Key held successful talks with Chinese President Xi Jinping in Wellington...

“Today we have agreed to characterise the relationship between our nations as a Comprehensive Strategic Partnership, recognising the significance of the bilateral relationship to both countries.”

Ten new agreements and arrangements between New Zealand and China have been signed, including an amendment to the Free Trade Agreement that will enable a television co-production arrangement. More>>

 

Parliament Today:

Savings Targets: Health Procurement Plan Changes Direction

Next steps in implementing DHB shared services programme Health Minister Jonathan Coleman says the Government has agreed to explore a proposal put forward by DHBs to move implementation of the shared services programme to a DHB-owned vehicle. More>>

ALSO:

More on Health Policy:

Auckland Unification: 'No IT Cost Blowout' (Just More Expensive)

Following discussion of an update on Auckland Council’s Information Services Transformational Programme at today’s Finance and Performance Committee, council has released the report publicly. More>>

ALSO:

Other Expensive Things:

Gordon Campbell: On The SAS Role Against Islamic State, And Podemos

Only 25% of the US bombing runs are even managing to locate IS targets worth bombing. As the NYT explains at length, this underlines the need for better on-the-ground intelligence to direct the air campaign to where the bad guys have holed up... More>>

ALSO:

Public Service: Commission Calls For Answers On Handling Of CERA Harassment

EEO Commissioner Dr Jackie Blue is deeply concerned about the way in which the State Services Commission has handled sexual allegations made against CERA chief executive Roger Sutton this week and is calling for answers. More>>

ALSO:

Gordon Campbell:
On Andrew Little’s Victory

So Andrew Little has won the leadership – by the narrowest possible margin – from Grant Robertson, and has already been depicted by commentators as being simultaneously (a) the creature of the trade unions and (b) the most centrist of the four candidates, which would be an interesting trick to see someone try in a game of Twister. More>>

ALSO:

China President Wishlists: Greens Welcome Xi, But Human Rights Need To Be On Agenda

“President Xi has made some progress on climate change, but he must also lift the Chinese government’s game on human rights issues,” Green Party Co-leader Dr Russel Norman said... It is important that our Government continues to urge the Chinese government to show restraint and respect human rights in both Tibet and the Xinjiang province.” More>>

ALSO:

Airport Security Breach: CAA Fines Minister

Minister Brownlee has been issued an infringement notice and is required to pay a $2000 infringement fine for breaching Civil Aviation Rule 19.357(b), which states no person may be in an airport security area without an appropriate identity card or document. More>>

ALSO:

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news