What is It?

@rick-taylor?ÿ

It's mostly crowned or pitched pavement or dirt roads to swales where I am.?ÿ In downtown areas and new subdivisions there'll be CB's and drain lines.?ÿ That valley gutter is a new one to me

On a preliminary, I might call it an inverted speed bump, and then change it to whatever the reviewer wants to call it.?ÿ 🙂

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It's a Flume...

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@dougie?ÿ

Thanks. I used up all my allowed guessing.

Conc is always a fall back. ?????ÿ

fancy?ÿ

A good place to put a traverse point.?ÿ

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@field-dog no need for grass in a swale, but cross gutter does sound better (ie more descriptive)