The judge described Mr Lawlor's failure to comply with the orders of discovery as "blatant defiance".
Another worker taking part in the rally was John Lawlor who is employed by Park Ranger Services.
Liam Lawlor will go to jail on Wednesday unless he appeals the sentence to the Supreme Court.
Mr Justice Smyth ruled that Mr Lawlor must serve at least seven days in prison for contempt.
Mr Lawlor resigned from Fianna Fail last year, after failing to co-operate with an internal party inquiry into alleged planning corruption.
John Anthony Lawlor, 42, a lorry driver from Whitewell Road in Glengormley, is charged with perverting the course of justice and making a false statement.
The charges arise out of Mr Lawlor's refusal to comply with High Court and Supreme Court orders of discovery from the Flood Tribunal sitting in Dublin.
Mossie Lawlor was first to cross the Welshmen's try line just before half-time, finishing off in the corner after some heavy Munster pressure in front of the posts.
In this well-researched book, Clark Lawlor of Northumbria University roams through the history and culture of depression and shows how attitudes to the illness have changed through the ages.
Mr Lawlor, formerly a member of Fianna Fail and now an independent TD for Dublin West, showed no emotion as Mr Justice Thomas Smyth gave his ruling at Dublin High Court on Monday.
Where does Lawlor see this all going?
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