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2% grade is equal to 1/4" per foot or 1:50(metric)

If you know the length and the grade and need the total fall:

TF=l x g
:. TF = 50' x 1/4"per foot (or 0.25)
TF = 12.5" or 12'-6"

To find the grade:
g = TF / l

To find the length:
l = TF / g

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