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==Slope Gradient==
==Slope Gradient==
Slope gradients are expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run:
Slope gradients are expressed as Y:X where Y is a single unit of rise and X is the corresponding run. It can be calculated by dividing the rise by the run:
e.g.:<math>\frac{rise}{run}=\frac{4\ m}{12\ m}=3</math>
e.g.:<math>\frac{rise}{run}=\frac{4\ m}{12\ m}=3</math> slope=1:3
slope=1:3