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{{float right|[[File:Theta.jpg|border|500 px]]}}
{{float right|[[File:Theta.jpg|border|500 px]]}}
===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 are common form of expression for steeply sloped areas like the sides of [[swales]]. 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}=\frac{1}{3};we\ say\ the\ slope\ =1:3\ or\ 1\ in\ 3</math>
e.g.:<math>\frac{rise}{run}=\frac{4\ m}{12\ m}=\frac{1}{3};we\ say\ the\ slope\ =1:3\ or\ 1\ in\ 3</math>


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