#WaterWatch

Invasive alien vegetation a major threat to Cape dam levels - scientist

Alien vegetation poses a significant threat to Cape Town's water supply, says biodiversity scientist Jasper Slingsby.

Slingsby co-authored an opinion piece that appeared on the Daily Maverick.

He says that removing alien trees near water catchment areas should form part of the City of Cape Town's water augmentation schemes.

Read: Zandvlei water area closed over high E.coli count

Slingsby claims that invasive alien trees currently reduce water supply to dams by more than 100 megalitres per day.

He says alien vegetation also impacts on groundwater replenishment.

According to Slingsby, an aggressive alien removal plan is needed around key catchment areas which are the most invaded and which have higher rainfall.

These include high-altitude catchments around Berg River dam and some feeding the Theewaterskloof dam, he argues.

Also read: Cape rains have made a slight dent on the drought says national water dept

Slingsby laments that the City has made no significant provision for alien clearing in its draft budget or development plan.

Alien trees use a lot more water than the indigenous vegetation.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

It means water lost from the catchment.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

The result is that, for a given amount of rain, you have less water making to the dams and into your groundwater.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

Current estimates are that it's more than a 100 megalitres [lost] per day just for dams around Cape Town.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

That's roughly 10% of the water that should be making it into the dam. It's projected to be much worse by 2045.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

This should be step one in water security. We are dependent on water from the dams.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

They are not investing in improving the water flow.

Jasper Slingsby, Scientist with the Fynbos Node of the South African Environmental Observation Network

Take a listen to his expert advice:


This article first appeared on CapeTalk : Invasive alien vegetation a major threat to Cape dam levels - scientist


Recommended

by NEWSROOM AI
Read More
Capetonians water consumption down by about 536 million litres of water a day

Capetonians water consumption down by about 536 million litres of water a day

Mayco member for water and waste, Xanthea Limberg talks to Kieno Kammies about Cape Town's latest dam levels.

Here are the amended level 3 water restrictions for Cape Town

Here are the amended level 3 water restrictions for Cape Town

The City has further relaxed level 3 water restrictions allowing the use of a hosepipe fitted with a self-closing system.

Cape winter rainfall predictions 'too soon to tell'

Cape winter rainfall predictions 'too soon to tell'

Piotr Wolski of the Climate Systems Analysis Group at UCT talks to Kieno Kammies about this year's winter rainfall pattern.

Alien Attack! The trees causing CPT to lose 50 billion litres of water each year

Alien Attack! The trees causing CPT to lose 50 billion litres of water each year

Director at the Nature Conservancy South Africa Louise Stafford says the loss is equivalent to two months water supply.

10 key changes that kick in when water restrictions drop from Level 5 to Level 3

10 key changes that kick in when water restrictions drop from Level 5 to Level 3

Cape Town is dropping water restrictions from Level 5 to Level 3 as of Saturday, 1 December. Here's how it'll affect residents.

Cape rains have made a slight dent on the drought says national water dept

Cape rains have made a slight dent on the drought says national water dept

Spokesperson for the Department of Water Affairs Sputnik Ratau says two good rainy seasons are needed to turn things around.

Popular articles
How to calculate how much money you need to never have to work again

How to calculate how much money you need to never have to work again

How much is enough? Is there a simple calculation? Warren Ingram, a personal financial advisor at Galileo Capital, explains.

[WATCH] BMW's tribute to Mercedes-Benz maker CEO Dieter Zetsche goes viral

[WATCH] BMW's tribute to Mercedes-Benz maker CEO Dieter Zetsche goes viral

Khabazela shares tweets and Facebook posts that have gone viral.

Enjoy life and save for the future by splitting income using the '50/15/5 rule'

Enjoy life and save for the future by splitting income using the '50/15/5 rule'

You only live once — personal finance guru Warren Ingram on divvying up your income if you're not the budgeting type.

[WATCH] Twin toddlers climbing a fridge has Twitter in stitches!

[WATCH] Twin toddlers climbing a fridge has Twitter in stitches!

Khabazela shares tweets and Facebook posts that have gone viral.

'Thuli Madonsela’s name has been mentioned for Deputy President'

'Thuli Madonsela’s name has been mentioned for Deputy President'

Lumkile Mondi (Wits), Ferial Haffajee and Busisiwe Mavuso (Business Leadership SA) on the President's upcoming "slim" Cabinet.

[Exposed] Car dealerships, banks in cahoots; you’re not always getting best deal

[Exposed] Car dealerships, banks in cahoots; you’re not always getting best deal

Consumer journalist Wendy Knowler uncovered evidence of banks sending dealer principles on holidays abroad for hitting targets.

Dis-Chem drives ad expert to 'Steve Hofmeyr-like assaults' on his decoder

Dis-Chem drives ad expert to 'Steve Hofmeyr-like assaults' on his decoder

"It’s been said you can’t bore people into buying your brand. Someone should’ve pointed this out to Dis-Chem," says Andy Rice.

'It is very clear that Ramaphosa is under attack from Magashule and others'

'It is very clear that Ramaphosa is under attack from Magashule and others'

News24 editor-in-chief Adriaan Basson says there is a definite fight back from the ANC secretary-general against the president.