1. What is the Discharge Given Aquifer Constant Formula?

The Discharge Given Aquifer Constant formula calculates the rate of flow of groundwater using the aquifer constant (coefficient of transmissibility) and drawdown measurements from two observation wells.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — Discharge (m³/s)
• \( T \) — Aquifer Constant/Transmissibility (m²/day)
• \( s_1 \) — Drawdown in well 1 (m)
• \( s_2 \) — Drawdown in well 2 (m)

Explanation: This formula calculates groundwater discharge based on the difference in drawdown between two observation wells and the aquifer's transmissibility coefficient.

3. Importance of Discharge Calculation

Details: Accurate discharge calculation is essential for groundwater resource management, well field design, and understanding aquifer characteristics for sustainable water supply planning.

4. Using the Calculator

Tips: Enter aquifer constant in m²/day, drawdown measurements in meters. Ensure drawdown values are different (s₁ ≠ s₂) for valid calculation.

5. Frequently Asked Questions (FAQ)

Q1: What is aquifer constant/transmissibility?
A: Aquifer constant (T) represents the ability of an aquifer to transmit water through its entire saturated thickness, measured in m²/day.

Q2: Why are two drawdown measurements needed?
A: Two measurements provide the hydraulic gradient necessary to calculate groundwater flow using Darcy's law principles.

Q3: What are typical values for aquifer constant?
A: Values range from 10-1000 m²/day for most aquifers, with higher values indicating more productive aquifers.

Q4: When is this formula most applicable?
A: This formula is particularly useful for confined aquifers and steady-state flow conditions with two observation wells.

Q5: What are the limitations of this approach?
A: Assumptions include homogeneous aquifer properties, steady-state conditions, and fully penetrating wells, which may not always reflect real-world conditions.