1. What is Formation Constant T?

Formation Constant T given Change in Drawdown is defined as the difference at the two wells in unsteady flow conditions. It represents the transmissivity of the aquifer formation.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( FT \) — Formation Constant T (m²/s)
• \( Q \) — Discharge rate (m³/s)
• \( \Delta d \) — Change in Drawdown (m)
• \( \pi \) — Archimedes' constant (approximately 3.1416)

Explanation: This formula calculates the formation constant based on discharge rate and the change in drawdown between two observation wells.

3. Importance of Formation Constant Calculation

Details: Accurate calculation of formation constant T is crucial for groundwater flow analysis, aquifer characterization, and well field management in hydrogeological studies.

4. Using the Calculator

Tips: Enter discharge in m³/s and change in drawdown in meters. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the significance of the constant 2.303 in the formula?
A: The constant 2.303 is used for conversion from natural logarithm to base-10 logarithm in the derivation of the formula.

Q2: What are typical values for Formation Constant T?
A: Values vary widely depending on aquifer type, ranging from 0.001 to 1000 m²/s for different geological formations.

Q3: When should this calculation be used?
A: This calculation is particularly useful in pumping test analysis and aquifer performance evaluation.

Q4: Are there limitations to this formula?
A: The formula assumes ideal conditions and homogeneous aquifer properties. Real-world applications may require additional corrections.

Q5: How does change in drawdown affect the formation constant?
A: The formation constant T is inversely proportional to the change in drawdown - larger drawdown changes result in smaller formation constants.