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The Pumping Rate formula calculates the volume of water that is pumped per unit of time based on transmissivity and drawdown across one log cycle. It is particularly useful for inconsistent units from distance-drawdown graphs in hydrogeological studies.
The calculator uses the formula:
Where:
Explanation: This formula calculates the pumping rate by multiplying transmissivity by the drawdown across one log cycle and then dividing by the constant 70.
Details: Accurate pumping rate calculation is crucial for groundwater management, well design, and understanding aquifer characteristics. It helps determine sustainable water extraction rates and assess the impact of pumping on aquifer systems.
Tips: Enter transmissivity in Square Meter per Second and drawdown across one log cycle (unitless). Both values must be positive numbers greater than zero.
Q1: What is transmissivity in groundwater hydrology?
A: Transmissivity is the rate at which groundwater flows horizontally through an aquifer. It represents the ability of an aquifer to transmit water throughout its entire saturated thickness.
Q2: What does drawdown across one log cycle represent?
A: Drawdown across one log cycle refers to the change in water level in an aquifer due to pumping from a well, measured across one logarithmic cycle on a distance-drawdown graph.
Q3: Why is the constant 70 used in this formula?
A: The constant 70 is derived from empirical relationships and unit conversions that make the formula work with inconsistent units typically found in distance-drawdown graphs.
Q4: What are typical units for pumping rate?
A: Pumping rate is typically measured in cubic meters per second (m³/s), liters per second (L/s), or gallons per minute (GPM), depending on the application and regional standards.
Q5: When is this formula particularly useful?
A: This formula is especially valuable when working with distance-drawdown graphs that may have inconsistent units, providing a standardized approach to calculate pumping rates.