1. What is Formation Constant for Unsteady Flow?

Formation Constant for Unsteady Flow is an equilibrium constant for the formation of a complex in solution in hydrogeological contexts. It represents the aquifer's ability to transmit water under unsteady flow conditions.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Fc \) — Formation Constant for Unsteady Flow (m²/s)
• \( Q \) — Discharge rate (m³/s)
• \( Wu \) — Well Function of u (dimensionless)
• \( st \) — Total Drawdown in Well (m)
• \( \pi \) — Mathematical constant pi (approximately 3.1416)

Explanation: This formula calculates the formation constant based on discharge rate, well function value, and total drawdown observed in the well.

3. Importance of Formation Constant Calculation

Details: Accurate calculation of formation constant is crucial for analyzing aquifer characteristics, predicting groundwater flow behavior, and designing effective well systems in unsteady flow conditions.

4. Using the Calculator

Tips: Enter discharge in m³/s, well function value (dimensionless), and total drawdown in meters. All values must be positive and valid for accurate results.

5. Frequently Asked Questions (FAQ)

Q1: What is the Well Function of u?
A: Well Function of u is a data plot of drawdown versus time (or drawdown versus t/rz) matched to the type curve of W(u) versus 1/u in aquifer testing.

Q2: What are typical values for Formation Constant?
A: Values vary widely depending on aquifer characteristics, ranging from 10⁻⁵ to 10⁻¹ m²/s for different geological formations.

Q3: When should this calculation be used?
A: This calculation is essential in hydrogeological studies, well design, and aquifer analysis where unsteady flow conditions prevail.

Q4: Are there limitations to this formula?
A: The formula assumes ideal aquifer conditions and may need adjustments for complex geological settings or boundary effects.

Q5: How accurate is this calculation?
A: Accuracy depends on the precision of input measurements, particularly the well function value and drawdown measurements.