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‘Aerodynamic’

Rain Gauges

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*** NEWSFLASH!!! ***

The shape of your rain gauge is critical!

Here’s why: Wind accelerates up and over old-

fashioned rain gauges, causing rain to be blown

away! Improving the shape encourages wind to

blow around the instrument, improving the rainfall

measurement accuracy! Here’s scientific proof:

*Colli et al. (2017) A Computational Fluid-Dynamics assessment of the improved performance of aerodynamic rain gauges.

Water Resources Research, Conditionally accepted.

The computational fluid dynamics images show

how the air accelerates over and away from the old-

fashioned gauge causing rain ‘undercatch’, but for

the EML gauges the wind comes back down again!

But we didn’t rely only on computer models,

because at EML we believe real proof is found in

field data! So, we conducted some experiments!

Old-fashioned shape Aerodynamic shape

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This is the research station with WMO approved

reference ground-level ‘pit gauge’ measurements to

investigate the wind effect on rainfall measurement.

Nafferton Farm, Northumberland, UK

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What happens when it gets really windy...?

The undercatch of old-fashioned gauges is up to

20% in windy conditions! EML’s aerodynamic

rain gauges are scientifically proven to be better!

Talla Water, Scottish Borders, UK

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What rain gauges can you get from EML?

Here’s a nice table to help you:

The Kalyx-RG and the SBS looking awesome!

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EML’s high-quality aerodynamic rain

gauges are used extensively by the UK

Meteorological Office and the Scottish

Environmental Protection Agency (SEPA).

Why don’t you get the best possible rainfall

measurements, too? You deserve it!

©EML 2017