Drainage Slope Calculator
Calculate drainage slope percentages and gradients for pipes, gutters, and landscaping. Determine proper slope for efficient water drainage and prevent pooling.
Step 1: Drainage Dimensions
Understanding Drainage Slopes
Proper drainage slopes typically range from 0.125″ to 1″ per foot. Landscape drainage requires at least 0.25″ per foot, while sewer pipes need 0.125″ per foot minimum.
Step 2: Units & Options
About Drainage Slopes
Proper drainage slope prevents water pooling, foundation damage, and erosion. Insufficient slope causes standing water, while excessive slope may cause erosion or pipe separation.
Drainage Slope Results
Slope Percentage
Drainage Type Slope Requirements
| Drainage Type | Minimum Slope | Recommended Slope | Slope Percentage |
|---|
Slope Visualization
Slope Calculation Formula
Slope Percentage = (Drop ÷ Run) × 100
To calculate slope percentage: Divide the vertical drop by the horizontal run, then multiply by 100 to get percentage. For inches per foot: Drop per foot = Total Drop ÷ Run Length.
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