1. What is the Well Parameter?

The Well Parameter (u) is a dimensionless parameter that characterizes how water levels in a well change over time when water is being pumped. It governs the behavior of groundwater flow and is essential in well hydraulics analysis.

2. How Does the Calculator Work?

The calculator uses the Well Parameter formula:

Where:

• \( r \) — Distance from Pumping Well (m)
• \( S \) — Storage Coefficient (dimensionless)
• \( T \) — Transmissivity (m²/s)
• \( t \) — Time Period (s)

Explanation: The formula relates the geometric and hydraulic properties of an aquifer to determine the well parameter, which is crucial for analyzing drawdown in pumping tests.

3. Importance of Well Parameter Calculation

Details: Accurate calculation of the well parameter is essential for designing pumping tests, analyzing aquifer properties, predicting drawdown behavior, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter distance from pumping well in meters, storage coefficient (dimensionless), transmissivity in m²/s, and time period in seconds. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of Well Parameter values?
A: Well Parameter values typically range from 10⁻⁶ to 10⁻¹, depending on aquifer properties and test conditions.

Q2: How does Well Parameter relate to drawdown?
A: The Well Parameter is used in the Theis equation to calculate drawdown in confined aquifers during pumping tests.

Q3: What are typical values for Storage Coefficient?
A: For confined aquifers, S ranges from 10⁻⁵ to 10⁻³; for unconfined aquifers, it's typically 0.01 to 0.3.

Q4: How is Transmissivity measured?
A: Transmissivity is typically determined through pumping tests, slug tests, or estimated from hydraulic conductivity and aquifer thickness.

Q5: What time units should be used?
A: While seconds are used in the formula, consistent time units must be maintained throughout the calculation.