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# Grade change without vertical curve

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## Grade change without vertical curve

(OP)
thread194-36445: Vertical curves minimum alg. diff.
I have not work on roads but come across problem with 50' curve with 7> grade without vertical curve. designer come up with 7.5" vertical height from low point to high point. Is anybody can show me how this calculated/
I saw 1% incoming and 1.5% outgoing slope on 20M curve shows the difference in elevation. can you show how you got the number? Is it not 1+1.5 makes 2.5 grade change?
Thanks.

### RE: Grade change without vertical curve

Google: vertical curve formulas

### RE: Grade change without vertical curve

Vertical change without a curve is accomplished by a linear slope.......Y = mx+b

### RE: Grade change without vertical curve

(OP)
Thanks for help

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