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Slope Ratio Formula:
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Slope ratio represents the relationship between horizontal distance (run) and vertical change (rise) in grading and earthwork projects. It is commonly expressed as a ratio (e.g., 4:1) or as a percentage.
The calculator uses the slope ratio formulas:
Where:
Explanation: The ratio shows how many units of horizontal distance correspond to one unit of vertical change, while the percentage expresses the vertical change as a percentage of the horizontal distance.
Details: Accurate slope calculation is essential for proper drainage design, road construction, landscaping, foundation work, and ensuring structural stability in civil engineering projects.
Tips: Enter run and rise values in meters. Both values must be positive numbers, with run greater than zero. The calculator will provide both ratio and percentage formats.
Q1: What is a typical slope ratio for drainage?
A: For proper drainage, slopes typically range from 1% to 2% (1:100 to 1:50 ratio) depending on the surface material and local regulations.
Q2: How is slope ratio different from slope percentage?
A: Slope ratio expresses the relationship as Run:Rise (e.g., 4:1), while slope percentage expresses rise as a percentage of run (e.g., 25% for 4:1 ratio).
Q3: What is the maximum slope for accessibility?
A: ADA guidelines recommend maximum slopes of 1:12 (8.33%) for ramps, with steeper slopes requiring handrails and specific design considerations.
Q4: How do I convert between ratio and percentage?
A: To convert ratio to percentage: Percentage = (1/Ratio) × 100. To convert percentage to ratio: Ratio = 100/Percentage.
Q5: What are common slope ratios in construction?
A: Common ratios include 2:1 (50%) for embankments, 3:1 (33.3%) for cut slopes, and 4:1 (25%) for gentle landscaping slopes.