1. What is Distance From Pumping Well?

Distance from Pumping Well is the horizontal distance between a specific point in an aquifer and the location of a pumping well. It influences the behavior of groundwater flow and is crucial for understanding drawdown patterns in aquifer tests.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( r \) — Distance from pumping well (meters)
• \( T \) — Transmissivity (m²/s)
• \( t_0 \) — Starting time (seconds)
• \( S \) — Storage coefficient (unitless)

Explanation: This formula calculates the distance from a pumping well based on aquifer properties and test duration, using the square root function to determine the radial distance.

3. Importance of Distance Calculation

Details: Calculating the distance from a pumping well is essential for designing groundwater monitoring networks, analyzing aquifer test data, and predicting drawdown effects at various locations in an aquifer system.

4. Using the Calculator

Tips: Enter transmissivity in m²/s, starting time in seconds, and storage coefficient (unitless). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is transmissivity in groundwater hydrology?
A: Transmissivity is the rate at which groundwater flows horizontally through an aquifer, representing the ability of the aquifer to transmit water.

Q2: What does storage coefficient represent?
A: Storage coefficient is the volume of water released from storage per unit decline in hydraulic head in the aquifer, per unit area of the aquifer.

Q3: When is this formula typically used?
A: This formula is commonly used in aquifer pumping tests to determine the distance at which specific drawdown effects occur or to design monitoring well placement.

Q4: What are typical ranges for storage coefficient?
A: Storage coefficient typically ranges from 0.0001 to 0.001 for confined aquifers and 0.01 to 0.3 for unconfined aquifers.

Q5: How accurate is this calculation?
A: The accuracy depends on the precision of input parameters and how well the aquifer conditions match the assumptions of the formula (homogeneous, isotropic aquifer).