1. What Is The Depression Head Calculation?

The depression head calculation determines the water level depression in a well at a specific time after pumping has stopped, particularly in fine sand aquifers. This is important for understanding aquifer recovery and hydraulic properties.

2. How Does The Calculator Work?

The calculator uses the formula:

Where:

• \( h_2 \) — Depression head at time T after pumping stopped (m)
• \( h_1 \) — Initial depression head when pumping stopped (m)
• \( t \) — Time elapsed since pumping stopped (s)

Explanation: This formula models the recovery of water levels in fine sand aquifers, accounting for the specific hydraulic properties of this soil type.

3. Importance Of Depression Head Calculation

Details: Accurate depression head calculations are crucial for groundwater management, well design, and understanding aquifer characteristics. They help determine safe pumping rates and recovery times.

4. Using The Calculator

Tips: Enter the initial depression head in meters and the time elapsed in seconds. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is this specific formula used for fine sand aquifers?
A: Fine sand has unique hydraulic properties that affect water level recovery. This formula accounts for the specific drainage characteristics of fine sand.

Q2: How accurate is this calculation for different soil types?
A: This formula is specifically calibrated for fine sand. Different formulas should be used for clay, gravel, or other soil types.

Q3: What time units should be used in the calculation?
A: Time should be entered in seconds, as the formula converts to hours internally using the 3600 factor (seconds per hour).

Q4: Can this be used for multiple well systems?
A: This formula is designed for single well recovery analysis. More complex models are needed for multiple well interference.

Q5: What are typical recovery rates in fine sand aquifers?
A: Fine sand typically shows moderate recovery rates - faster than clay but slower than coarse sand or gravel aquifers.