How close can contour lines of the same elevation come together?

Question: How close can contour lines of the same elevation come together? (IE: the angle of the triangle of the swale)

Response:

You mean the tips of the two swalves? Very close, but not a magic number. I’d say 6”, 1’ or 2’ is fine.

You want to bring the two tips as close to close to each other as possible to avoid water from flowing onto the pad.

In realty, there is a High Point (HP) at that location.

Gang Chen, Author, AIA, LEED AP BD+C

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