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Modified Drawdown in Well 2 is a calculated value that adjusts the measured drawdown in well 2 by accounting for the initial aquifer thickness. This modification provides a more accurate representation of the actual drawdown behavior in groundwater systems.
The calculator uses the formula:
Where:
Explanation: This formula adjusts the measured drawdown by subtracting a correction factor that accounts for the squared drawdown relative to twice the initial aquifer thickness.
Details: Calculating modified drawdown is crucial for accurate groundwater modeling and analysis. It helps correct for non-linear effects in drawdown measurements, providing more reliable data for aquifer characterization and groundwater resource management.
Tips: Enter the drawdown in well 2 and initial aquifer thickness in meters. Both values must be positive numbers, with initial aquifer thickness greater than zero.
Q1: Why modify the drawdown measurement?
A: The modification accounts for non-linear effects and provides a more accurate representation of the actual drawdown behavior in the aquifer system.
Q2: When should this modified drawdown be used?
A: Modified drawdown is particularly useful in groundwater modeling, pumping test analysis, and aquifer characterization studies where accurate drawdown values are critical.
Q3: What are typical values for drawdown and aquifer thickness?
A: Drawdown values typically range from 0.1 to 10 meters, while aquifer thickness can vary from a few meters to hundreds of meters depending on the geological formation.
Q4: Are there limitations to this formula?
A: This formula assumes specific aquifer conditions and may need adjustment for complex geological settings or extreme values of drawdown relative to aquifer thickness.
Q5: How does initial aquifer thickness affect the result?
A: Larger initial aquifer thickness results in a smaller correction factor, making the modified drawdown closer to the measured drawdown value.