News Archive

Spot measurement v. continuous environmental monitoring

August 25, 2023

Environmental monitoring has developed considerably over the years. From the time when a consultant went out monthly or quarterly with a dip tape to monitor the groundwater level in a borehole, wind forward...

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Measuring Nitrates (NO3, NO3-N) in the field

June 20, 2023

The interest in Nitrates is nothing new. One way or another we have been measuring them for half a century.

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Save time, save money, save effort, get better results – use low-flow sampling…

June 1, 2023

A client recently contacted me to ask if we can repair their high flow purge pump and or sell then a new one.  They were using it for (among other applications) to purge a 70m deep bore 3 times for a...

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Environmental monitoring – things can and probably will go wrong!

May 30, 2023

The chains are on, 4WD is locked in and we are well past the point of no-return. The season has not started yet but there’s enough snow already to add to the complexity of maintaining a service. We’re...

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Van Walt focuses on Flumes

January 23, 2023

For anyone involved in Water Management you will know about flumes. A flume is used to quantify flow in open channels such as streams, field ditches and irrigation channels. Flumes are man made flow control...

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Deploying sensors in artesian wells

June 15, 2022

The United Kingdom just celebrated the Queen’s Platinum Jubilee. It was a long weekend of pageantry, pomp and circumstance and it was a lot of fun and never lost the focus on the achievement of this...

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Training Day in South Africa

April 20, 2022

Van Walt has been offering training on a range of environmental sampling subjects for over 30 years. In that time hundreds of delegates have been through our courses from Window Sampling, Groundwater Sampling...

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Van Walt’s Window Sampling System in action

July 22, 2021

From the Sundarbans, the Congo and Kurdistan, to a Roman fortification at the Eastern end of Hadrian’s Wall in Northeast England, you can find our Window Sampling Systems. This is where our latest training...

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Geosub2, a 21st century Grundfos MP1 alternative

April 16, 2021

I’ve been in this game now for over 40 years and I don’t think I can remember the time when the Grundfos MP1 was not around. But then memory can sometimes play games as well at my ripe old age.

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Soil Moisture Probes test Concrete

Van Walt has partnered IMKO for decades. IMKO, based near Karlsruhe in Germany was owned by the Koehler family. Kurt Koehler was always rather more interested in extracting every last milli-percentage...

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Van Walt Supporting Capacity Building in Africa

November 9, 2020

I am coming to the “end of the beginning” of a project to build capacity in freshwater management in Africa. The inspiration for the project came in 2014 during my first job in nature conservation...

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Freshwater ecosystems of Madagascar: in extreme need of restoration

August 27, 2020

Starting out on my internship with the Tropical Biology Association (TBA), supported by Van Walt, I knew very little about Madagascar. However, right from the beginning of my research it was apparent that...

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