Gutter Flow Rate Calculator

The Gutter Flow Rate Calculator is designed to help homeowners and builders determine the flow rate of water through a gutter system based on its dimensions and the intensity of rainfall. This is crucial for ensuring that gutters are appropriately sized to handle heavy rain and prevent overflow, which can cause water damage to buildings.

Calculation Formula

The formula used to calculate the flow rate is:

\[ \text{Flow Rate (gallons/minute)} = \text{Cross-sectional Area (sq ft)} \times \text{Rainfall Intensity (in/hr)} \times 448.831 \]

Where:

• Cross-sectional Area is calculated from the width and depth of the gutter (converted to square feet).
• Rainfall Intensity is the rate of rainfall in inches per hour.
• 448.831 is the conversion factor from cubic feet per second to gallons per minute.

Example Calculation

If your gutter width is 5 inches, depth is 4 inches, and rainfall intensity is 2 inches per hour:

\[ \text{Cross-sectional Area} = \frac{5 \times 4}{144} = 0.1389 \text{ square feet} \]

\[ \text{Flow Rate} = 0.1389 \times \frac{2}{12} \times 448.831 = 10.37 \text{ gallons/minute} \]

This tool helps ensure your gutters can handle the expected rainfall, thereby protecting your property from potential water damage.