# Slope Gradients **Slope gradient represents how steep a ramp is.**\ **It is represented by a ratio of rise to run.** Or its height and length respectively. The smaller the unit of run vs 1 unit of rise, the steeper the slope is. Thus a 1:8.3 slope is steeper than a 1:15 one. ## **Common gradients:** **(slope gradient listed are the maximum allowed and are non-exhaustive)** 1 : 2 - Steepest slope for earth without need for ERSS\* 1 : 8.3 - Steepest vehicular access slope 1 : 10 - Equipment ramp 1 : 12 - Wheelchair ramp 1 : 15 - Fire Engine deployment, heavy vehicles straight ramp 1 : 20 - Curved ramps for heavy/articulated vehicles (20/40ft trailers) 1 : 25 - Handicap Ramp without need for handrails 1 : 30 - Drainage gradient for public roads 1 : 100 - Screed to fall for roof drainage 1: 200 - Screed to fall for workshops drainage --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.archlogbook.co/02-urban-site-planning-building-design-concepts/slope-gradients.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.