Check with your City Hall. There usually isn't a minimum for drainage, as it rarely freezes. Water supply pipes do freeze.
The frost depth refers to how deeply frost can penetrate into the ground. In Martinsville, Virginia, the frost depth is around 18 inches deep.
3ft
What is the frost line depth in louisville Kentucky
The frost line in Ohio is 3ft
The frost line depth for Montreal is 4' 1/2" (1.2 m)
Up to July 2008 it was 4' per the NYC Code. I haven't dealt enough with the newly adopted code. I imagine it hasn't changed.
The frost line in Spokane, WA is typically around 24 inches deep. This is the depth at which soil is expected to freeze during the winter months. It is important to consider the frost line when planning construction projects to prevent damage from freezing and thawing.
The frost line in Springfield, MO is typically around 30 inches. This is the depth at which the ground is expected to freeze during the winter months. It's important for construction and landscaping to prevent frost heaving.
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What is the frostline depth in saskatchewan Canada
what`s frost depth in Edmonton south north 50 street road
no Frost