Helensburgh Public School's "Komplete Kaos" team left the competition in pieces at the First Lego League Open European Championships in Spain.
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The teams were judged on three criteria: their team's values, their Lego robot's ability to complete a set task, and an app project.
The team won first place in the Innovative Solutions category with their flood warning phone app.
They consulted the State Emergency Service over an app that would provide users with constant updates on conditions, and that had instant links to social media so users could let others know about their safety.
Marnie Parkinson, from year 6, said her team and the SES had discussed what the community needed to know during a flood and how they could avoid becoming stuck.
"The app can be personalised to remind you to bring things you need - for example, you can customise it so it reminds you to bring your asthma puffer," she said.
Competition was fierce on the international stage, with the primary school team going up against much older competitors.
"There were lots of teams made up of 17 and 18-year-olds," team member Matthew Wheatley said.
The team's coach and founder, Lilli Pang, approached the school's librarian, Steve McQueen, to create a robotics club after her son took part in a similar program. The club raised $6000 to buy starter kits and employ a trainer two years ago.
"I would say to parents to get their kids involved because it's fun and has incredible outcomes," she said.