Barlow's Formula For Runoff In Average Catchment With Light Rain Calculator

Barlow's Formula:

\[ R = 0.16 \times P \]

Runoff (R):

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1. What is Barlow's Formula for Runoff?

Barlow's Formula is a simple empirical equation used to estimate runoff in average catchment areas with light rain conditions. It provides a quick approximation of runoff based on rainfall measurements.

2. How Does the Calculator Work?

The calculator uses Barlow's Formula:

\[ R = 0.16 \times P \]

Where:

\( R \) — Runoff (cm)
\( P \) — Rainfall (cm)
0.16 — Empirical coefficient for average catchment with light rain

Explanation: The formula assumes that approximately 16% of the rainfall contributes to runoff in average catchment areas under light rain conditions.

3. Importance of Runoff Calculation

Details: Accurate runoff estimation is crucial for water resource management, flood prediction, irrigation planning, and environmental impact assessments in catchment areas.

4. Using the Calculator

Tips: Enter rainfall measurement in centimeters. The value must be valid (rainfall > 0). The calculator will compute the estimated runoff based on Barlow's empirical coefficient.

5. Frequently Asked Questions (FAQ)

Q1: When should Barlow's Formula be used?
A: Barlow's Formula is specifically designed for average catchment areas with light rain conditions. It may not be accurate for extreme weather conditions or specialized catchment types.

Q2: What are the limitations of this formula?
A: The formula uses a fixed coefficient (0.16) and doesn't account for factors like soil type, vegetation cover, slope, or rainfall intensity that can affect runoff rates.

Q3: How accurate is Barlow's Formula?
A: While useful for quick estimates, Barlow's Formula provides approximate values. For precise hydrological studies, more comprehensive models should be used.

Q4: Can this formula be used for heavy rainfall?
A: No, Barlow's Formula is specifically calibrated for light rain conditions. Different coefficients or formulas should be used for heavy rainfall scenarios.

Q5: What units should be used with this calculator?
A: Both rainfall input and runoff output are in centimeters. Ensure consistent units for accurate results.