1. What is the Depression Head Formula?

The Depression Head formula calculates the difference in water table level and water level in a well when pumping stops, using base 10 logarithm. It's essential for understanding well performance and groundwater behavior.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( h1 \) — Depression Head 1 (m)
• \( h2 \) — Depression Head 2 (m)
• \( KA \) — Specific Capacity (m/h)
• \( t \) — Time (h)
• 2.303 — Conversion factor from natural log to base 10

Explanation: This formula calculates the depression head at a specific time based on the initial depression head and the specific capacity of the well.

3. Importance of Depression Head Calculation

Details: Accurate depression head calculation is crucial for well design, groundwater resource management, and understanding aquifer characteristics and well performance.

4. Using the Calculator

Tips: Enter Depression Head 2 in meters, Specific Capacity in m/h, and Time in hours. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is Depression Head in well hydraulics?
A: Depression Head refers to the difference between the static water table level and the water level in the well during or after pumping.

Q2: Why use base 10 in this formula?
A: Base 10 logarithms are commonly used in hydraulic calculations as they provide convenient scaling and are easier to interpret in practical applications.

Q3: What factors affect Specific Capacity?
A: Specific Capacity depends on aquifer characteristics, well construction, and the efficiency of the well-aquifer system.

Q4: When is this formula most applicable?
A: This formula is particularly useful for analyzing recovery test data and predicting drawdown behavior in pumping wells.

Q5: Are there limitations to this equation?
A: The formula assumes ideal conditions and may need adjustments for complex aquifer systems or non-ideal well conditions.