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Slope Ratio Formula:
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A 1:20 slope ratio means that for every 1 unit of vertical rise, there are 20 units of horizontal run. This ratio is commonly used in construction, landscaping, and engineering for creating gentle slopes that provide adequate drainage while maintaining stability.
The calculator uses the slope ratio formula:
Where:
Explanation: The calculator determines your current slope ratio and calculates what either the rise or run should be to achieve the exact 1:20 ratio.
Details: Accurate slope calculation is crucial for proper drainage systems, ramp construction, road design, and landscape grading. A 1:20 slope provides a gentle incline that is accessible while ensuring water flows away effectively.
Tips: Enter either the rise or run measurement (or both) to calculate your current slope ratio and see what adjustments are needed to achieve a perfect 1:20 slope. All values must be positive numbers.
Q1: What is a 1:20 slope in percentage?
A: A 1:20 slope equals a 5% grade (1/20 × 100 = 5%).
Q2: Where is a 1:20 slope commonly used?
A: This slope is often used for wheelchair ramps, drainage ditches, road embankments, and landscape grading where a gentle slope is required.
Q3: How do I measure rise and run in the field?
A: Use a level and measuring tape. For rise, measure vertical height difference. For run, measure horizontal distance between the high and low points.
Q4: What's the difference between slope ratio and slope angle?
A: Slope ratio expresses the relationship as a ratio (1:20), while slope angle expresses it in degrees (approximately 2.86° for a 1:20 slope).
Q5: Can I use different units of measurement?
A: Yes, as long as you use the same units for both rise and run (meters, feet, etc.), the ratio will remain the same.