1. What is the Depression Head Formula?

The depression head formula calculates the difference in water table levels in a well when pumping stops. It helps determine how water levels recover after pumping and is essential for well hydraulics analysis.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( h_1 \) — Depression Head 1 (Meter)
• \( h_2 \) — Depression Head 2 (Meter)
• \( KA \) — Specific Capacity (Meter per Hour)
• \( t \) — Time (Hour)
• \( \exp \) — Exponential function

Explanation: The formula models the exponential recovery of water levels in a well after pumping stops, where the specific capacity and time determine the rate of recovery.

3. Importance of Depression Head Calculation

Details: Accurate depression head calculation is crucial for understanding well performance, determining aquifer characteristics, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter Depression Head 2 in meters, Specific Capacity in meters per hour, and Time in hours. All values must be 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 is specific capacity important?
A: Specific capacity indicates the well's productivity and efficiency, representing the discharge per unit drawdown.

Q3: How does time affect depression head recovery?
A: Longer time periods allow for more complete recovery of water levels toward the static water table level.

Q4: What are typical values for specific capacity?
A: Specific capacity varies widely depending on aquifer characteristics, ranging from less than 1 to over 100 m³/h/m of drawdown.

Q5: When should this formula be used?
A: This formula is used for analyzing well recovery tests and estimating aquifer properties in unconfined aquifers.