Culvert from the past unearthed at Halifax Common has been dismantled A culvert from the past unearthed at the Halifax Common in December has been documented, broken apart, removed and used as fill. Social Sharing 'It tells the story of the city development and how the city changed over time,' says professor Posted: Apr 25, 2021 6:00 AM AT | Last Updated: April 25 An excavation revealed a portion of what is believed to be Freshwater Brook.(Robert Guertin/CBC) A culvert from the past discovered last December during work at future site of a hospital parkade in Halifax has been dismantled and used as fill.