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Last edited 13 Jul 2021
The 2018 International Residential Code (IRC), published by the International Code Council (ICC) defines a slope as: ‘The fall (pitch) of a line of pipe in reference to a horizontal plane. In drainage, the slope is expressed as the fall in units vertical per units horizontal (percent) for a length of pipe.’
The word slope can also refer to the vertical distance divided by the horizontal distance of geographical features, lines, planes and so on.
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