Airdrop, as the system is known, borrows a trick from the Namib beetle, which can live in areas that receive just half an inch of rain per year by harvesting the moisture from the air that condenses on its back during the early morning hours. A hydrophilic skin helps to snare water molecules passing on the breeze, which then accumulate into droplets of consumable liquid water.

Airdrop mimics this idea, though on a larger scale. The self-powering device pumps air into a network of underground pipes, where it cools enough for water to condense. From there the moisture is delivered to the roots of nearby plants. Linacre's calculations show that about 11.5 millilitres can be harvested from every cubic metre of air, and further development could raise that number even higher.

Such a system could provide regular moisture to plants being grown in the world's driest regions. And because it is low cost and self-powered, there's not a lot of investment or maintenance involved in deploying Airdrop. The $14,000 award from Dyson (Swinburne also gets an additional $14,000) should help speed that along.

This year's runners up included a quickly deployable divider for medical settings that lets healthcare professionals make the most of available space and an aide for the blind that uses a special cane and location-based social networking apps to help the visually impaired locate their friends. All of this year's entries can be seen here.