Formula Used:
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The Drawdown Inside the Well refers to the radius of the pumping well is a change in groundwater level due to an applied stress. It is a crucial parameter in hydrogeology for understanding well performance and groundwater extraction impacts.
The calculator uses the formula:
Where:
Explanation: This formula calculates the actual drawdown inside the well by dividing the change in drawdown by the well efficiency factor.
Details: Accurate drawdown calculation is essential for determining well performance, assessing aquifer characteristics, and planning sustainable groundwater extraction strategies.
Tips: Enter the change in drawdown in meters and the well efficiency (dimensionless value). Both values must be positive numbers greater than zero.
Q1: What is well efficiency?
A: Well efficiency refers to the ratio of the drawdown in the aquifer at the radius of the pumping well to the drawdown inside the well.
Q2: Why is drawdown inside the well important?
A: It helps determine the actual water level drop within the well, which is crucial for pump placement and understanding well performance.
Q3: What are typical well efficiency values?
A: Well efficiency typically ranges from 0.6 to 0.8 (60-80%) for properly designed wells, but can vary based on well construction and aquifer conditions.
Q4: How is change in drawdown measured?
A: Change in drawdown is typically measured using pressure transducers or manual water level measurements before and during pumping.
Q5: Can this formula be used for all well types?
A: This formula is generally applicable to most pumping wells, but specific aquifer conditions and well construction may require additional considerations.