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crown of road

crown of road
by sprintcar on 11/02/05 at 17:40:50

I'm building a road and the plan has a 3% crown from middle to edge. no curb. If I have the edge elevation on the sides how do I figure the elevation in the middle.

Re: crown of road
by Robert Fogt on 11/04/05 at 05:42:52

I would draw it out as if it were a right triangle.

You know angle A is 1.72 degrees (3% slope), and side c is the width of the road.

The length of side a would be:
a = c sin A

Then you have the height of the middle, so just add that to the edge elevation to get the total elevation.

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