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The Straight Line Regression Formula between runoff and rainfall is used to estimate precipitation based on measured runoff values. It provides a mathematical relationship between these two hydrological variables using regression coefficients.
The calculator uses the formula:
Where:
Explanation: The formula reverses the regression equation to calculate rainfall from measured runoff values using the established regression coefficients.
Details: Accurate rainfall estimation from runoff measurements is crucial for hydrological studies, water resource management, flood prediction, and climate change impact assessments.
Tips: Enter runoff value in Centimeter, coefficient 'B' value, and coefficient 'a' value. Coefficient 'a' must not be zero to avoid division by zero error.
Q1: What are typical values for coefficients 'a' and 'B'?
A: Coefficient values vary by region and watershed characteristics. They are determined through regression analysis of historical rainfall-runoff data.
Q2: How accurate is this estimation method?
A: Accuracy depends on the quality of the regression model and how well it represents the specific watershed's characteristics.
Q3: When should this method be used?
A: This method is particularly useful when direct rainfall measurements are unavailable but runoff data exists.
Q4: Are there limitations to this method?
A: The method assumes a linear relationship and may not accurately represent complex hydrological processes in all watersheds.
Q5: Can this be used for real-time flood prediction?
A: While useful, real-time flood prediction typically requires more complex hydrological models that account for additional factors.