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A Perth university student who received a conviction for urinating in public has had the black mark struck from his record after winning a Supreme Court appeal.

Darcy Costello, 19, was charged after police caught him urinating in a Northbridge laneway on February 25.

He told police he "just needed to go" after he was dropped off in Northbridge after a University Football Club dinner, and the toilets at the nearby Aberdeen Hotel had long queues.

He pleaded guilty to disorderly conduct in the Perth Magistrate's Court on April 3 and was fined $500 and ordered to pay costs of $125.70.

But because Mr Costello was not present in court no application was made for a spent conviction order.

Mr Costello, who coaches water polo at his former school and is studying construction management and economics, appealed against the conviction in the Supreme Court, arguing it would have a prejudicial impact on his career prospects.

He said he did not attend court because of university commitments, and because of his youth and inexperience did not believe there was any prospect of a criminal conviction.

Supreme Court Justice Eric Heenan found while no error of law was made by sentencing Magistrate Paul Heaney, the failure to make a spent conviction order had resulted in a miscarriage of justice. "On all accounts, he is an impressive young man and it is obvious that he had no proper appreciation that his conduct might involve him in a breach of the law and result in a criminal conviction," Justice Heenan said.