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Frost depth in Ottawa = 1.8 meter

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https://www.raqsb.mto.gov.on.ca/techpubs/ops.nsf/fee5d2d0c518bc6c85257172004af2c6/a48e402f1bf0b57c852570c9006cfae6/$FILE/OPSD3090.101%20Rev%231%20Nov2010.pdf

frost line—also known as frost depth or freezing depth

http://www.almanac.com/content/frost-chart-canada

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