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Stormwater Runoff Volume Formula:
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Stormwater runoff volume calculation estimates the amount of water that will run off a surface during a rainfall event. This is essential for designing drainage systems, managing flood risks, and planning water conservation measures.
The calculator uses the stormwater runoff volume formula:
Where:
Explanation: The formula converts rainfall depth to volume by multiplying by the catchment area and dividing by 1000 to convert from liters to cubic meters.
Details: Accurate stormwater volume calculation is crucial for designing effective drainage systems, preventing flooding, managing water resources, and meeting regulatory requirements for stormwater management.
Tips: Enter rainfall in millimeters and area in square meters. Both values must be positive numbers. The calculator will provide the stormwater volume in cubic meters.
Q1: Why divide by 1000 in the formula?
A: The division by 1000 converts the result from liters to cubic meters (1 cubic meter = 1000 liters).
Q2: What is a typical rainfall value to use?
A: Use local rainfall data for your specific design storm. Common values range from 10-100 mm depending on climate and storm intensity.
Q3: Does this account for infiltration or evaporation?
A: No, this is a simple volumetric calculation that assumes all rainfall becomes runoff. For more accurate results, consider infiltration rates and evaporation losses.
Q4: Can I use different units?
A: The calculator is designed for mm and m². Convert other units accordingly (1 inch = 25.4 mm, 1 square foot = 0.0929 m²).
Q5: How accurate is this calculation?
A: This provides a theoretical maximum volume. Actual runoff may be less due to infiltration, surface retention, and other factors.