Permaculture Earthworks

Terrace Calculator

The vertical interval (Vi) for the terraces is the vertical distance from the base of one riser to the base of another riser. The vertical interval is given by

Vi = (S × Wb) ÷ (100 - S × U)

where S is the slope of the hillside in percent† (not degrees),

Wb is the width of the bench, and

U is the slope of the riser as a ratio.

TerracesFormulaOriginalslopeofhillWbViSlope (S)
Input numbers only. Use any distance units you like (i.e. feet, metres, inches, etc.) but do not mix units.


† Percent to degree converter

Degrees are expressed as percent with the following formula.

Percent = 100 × tan(Degrees)

Input numbers only.


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