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Barlow's Formula:
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Barlow's Formula for Runoff in Hills and Plains with Little Cultivation and Continuous Downpour is a simplified method to estimate runoff from rainfall. It uses a coefficient of 0.60, representing that approximately 60% of rainfall becomes runoff under these specific conditions.
The calculator uses Barlow's Formula:
Where:
Explanation: The formula assumes that 60% of the rainfall becomes surface runoff under the specified terrain and rainfall conditions.
Details: Accurate runoff estimation is crucial for water resource management, flood prediction, irrigation planning, and hydrological studies in hilly and plain areas with minimal cultivation.
Tips: Enter rainfall measurement in centimeters. The value must be valid (rainfall > 0). The calculator will compute the estimated runoff based on Barlow's coefficient of 0.60.
Q1: When is Barlow's Formula applicable?
A: This formula is specifically designed for hills and plains with little cultivation during continuous downpour conditions.
Q2: Why is the coefficient 0.60 used?
A: The 0.60 coefficient represents the empirical observation that approximately 60% of rainfall becomes runoff under the specified terrain and rainfall intensity conditions.
Q3: How accurate is this formula?
A: While simplified, it provides reasonable estimates for the specific conditions it was designed for, though actual runoff may vary based on soil type, slope, and other local factors.
Q4: Can this formula be used for other terrain types?
A: No, this formula is specifically calibrated for hills and plains with little cultivation. Different coefficients would be needed for urban areas, forests, or heavily cultivated lands.
Q5: What are the limitations of this approach?
A: The formula doesn't account for variations in soil moisture, evaporation rates, or changes in land use over time. It provides a simplified estimate rather than a precise calculation.