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Drainage Slope Formula:
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The Drainage Slope Calculation Formula calculates the percentage slope of a surface using the rise (vertical change) and run (horizontal distance). This is essential for ensuring proper water drainage in construction and landscaping projects.
The calculator uses the drainage slope formula:
Where:
Explanation: The formula calculates the slope as a percentage by dividing the vertical rise by the horizontal run and multiplying by 100.
Details: Proper drainage slope is crucial for preventing water accumulation, foundation damage, and erosion. It's essential for designing effective drainage systems in construction, landscaping, and civil engineering projects.
Tips: Enter the rise and run values in feet. Both values must be positive numbers greater than zero. The calculator will provide the slope percentage result.
Q1: What is the minimum slope required for proper drainage?
A: For most applications, a minimum slope of 1-2% (1-2 feet per 100 feet) is recommended for effective drainage.
Q2: Can I use different units of measurement?
A: While this calculator uses feet, the formula works with any consistent unit of measurement as long as both rise and run use the same units.
Q3: How does slope percentage relate to angle in degrees?
A: Slope percentage is different from angle in degrees. To convert slope percentage to degrees, use the formula: angle = arctan(slope/100).
Q4: What's the difference between slope ratio and slope percentage?
A: Slope ratio is expressed as rise:run (e.g., 1:100), while slope percentage is (rise/run)×100. A 1:100 ratio equals a 1% slope.
Q5: When is this calculation most important?
A: This calculation is critical when designing drainage systems, grading land, installing pipes, and planning construction projects where proper water runoff is essential.