IT WAS the clog up of debris from rainfall that prompted the Mundubbera State School to act, coming up with an idea to build a swale.
Swales are used in permaculture and are designed to slow and capture run-off by spreading horizontally across the landscape.
School groundsman Steven Crofts said it was a brilliant idea.
"It slows everything down, it drags the contour and stops all the mulch from going out there and from blocking up the fence,” Mr Crofts said.
"It can compost for 20 years.
"We've got big timber and we compost from underneath up, plants will go down in that timber and as it rots the plants will just feed off it.
"It's not new, it's 1000 years old.”
The students have been busy working on the swale as well as a bush tucker garden.
"The kids are cutting up timber, stacking the swales, we all got into the shovels to tidy the mounds up and they're enjoying it,” Mr Crofts said.
"The kids are learning about what the swale is, composting and learning that the moisture will stay in if you keep it well covered.
"Anything that's Australian bush, we've got a really good soil to get them.”
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