1. What is the Drawdown Calculation Formula?

The formula calculates drawdown in well 1 based on drawdown in well 2, discharge rate, and aquifer constant. It's used in hydrogeology to determine water level changes in pumping wells.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( s_1 \) — Drawdown in well 1 (Meter)
• \( s_2 \) — Drawdown in well 2 (Meter)
• \( Q \) — Discharge rate (Cubic Meter per Second)
• \( T \) — Aquifer Constant (also known as coefficient of transmissibility)

Explanation: This formula accounts for the additional drawdown in well 1 based on the discharge rate and aquifer properties.

3. Importance of Drawdown Calculation

Details: Accurate drawdown calculation is crucial for well design, groundwater resource management, and predicting the impact of pumping on aquifer systems.

4. Using the Calculator

Tips: Enter drawdown in well 2 in meters, discharge rate in cubic meters per second, and aquifer constant. All values must be valid positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is drawdown in hydrogeology?
A: Drawdown is the reduction in hydraulic head observed at a well in an aquifer, typically due to pumping.

Q2: What does the aquifer constant represent?
A: The aquifer constant (T) represents the transmissivity of the aquifer, indicating how easily water can move through the aquifer material.

Q3: When is this formula typically used?
A: This formula is used in pumping test analysis and groundwater modeling to predict drawdown effects in multiple wells.

Q4: What are the limitations of this formula?
A: The formula assumes ideal aquifer conditions and may need adjustments for complex geological settings or boundary conditions.

Q5: How accurate is this calculation?
A: Accuracy depends on the precision of input parameters and how well the aquifer conditions match the formula's assumptions.