If it goes ahead, it would cover an area the size of three football pitches and it would be big enough to hold over two million gallons.
However, it is the contents of this farm-based lagoon that really is causing a stink amongst the residents of Longtown.
An application from two adjoined farms containing a thousand dairy cows has been submitted to build a lagoon to contain animal waste, also known as slurry.
***Andy Burn reports.*
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Continuing cloudy and mild with outbreaks of rain, heavy at times over Galloway
Cloudy with outbreaks of rain, heaviest in west
Emma Jesson brings you Sunday night's forecast