Stormwater Engineering

Roof Drainage Gutter Flow Calculator

Calculate roof drainage gutter flow calculator given relevant engineering parameters.

Quick Answer

Calculate Rational Method Roof Gutter Flow Rate Calculator

Calculator

Volumetric Flow Rate (m³⁄s)
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Result Interpretation

Roof Drainage Gutter Flow Calculator computes Volumetric Flow Rate in m^3/s using the defined engineering formula and the input values provided.

Worked Example

Verified calculation

Given:

  • Runoff Coefficient = 0.9
  • Catchment Area = 120
  • Rainfall Intensity = 5.56E-5

Expected Result:

  • Volumetric Flow Rate = 0.0060048

Engineering Interpretation:

Under the given input conditions, the calculated result is: Volumetric Flow Rate = 0.0060048 m^3/s.

The actual numerical result is computed by the Runtime engine using the persisted tool definition. The values shown here come from automatically validated test cases.

Formula / Method

volumetric flow rate = runoff coefficient * catchment area * rainfall intensity

Formula family: formula_stormwater_roof_drainage_gutter_flow_calculator

Variables

SymbolLabelRoleDescription
Runoff Coefficient Runoff Coefficient INPUT Runoff Coefficient
Catchment Area Catchment Area INPUT Catchment Area
Rainfall Intensity Rainfall Intensity INPUT Rainfall Intensity
Volumetric Flow Rate Volumetric Flow Rate OUTPUT Volumetric Flow Rate

Calculation Steps

  1. Enter the runoff coefficient in dimensionless.
  2. Enter the catchment area in m^2.
  3. Enter the rainfall intensity in m/s.
  4. Step 1: Compute volumetric flow rate.
  5. Read the volumetric flow rate (m^3/s) from the results.

Engineering Summary

Calculate Rational Method Roof Gutter Flow Rate Calculator

Frequently Asked Questions

What does this calculator calculate?

The Roof Drainage Gutter Flow Calculator estimates Volumetric Flow Rate based on the input parameters you provide

Why is runoff coefficient important in this calculation?

runoff coefficient is directly proportional to volumetric flow rate. When you enter runoff coefficient in dimensionless, the calculator uses it in the engineering formula to compute the output

How should I interpret the result volumetric flow rate?

The calculator outputs volumetric flow rate in m^3/s. To convert to liters per second, multiply by 1000. For liters per minute, multiply by 60000. The result is computed directly from the input values using the defined engineering formula

What units should I use for the inputs?

Enter each value in the units shown next to the input field: Runoff Coefficient (dimensionless), Catchment Area (m^2), Rainfall Intensity (m/s). Make sure all inputs use the specified units for consistent results

What assumptions does this calculator use?

This calculator uses automatically validated engineering formulas. Results are approximate and should be validated against site-specific conditions, applicable codes, and professional engineering judgment

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