1. What is Specific Capacity?

Specific Capacity refers to the amount of water furnished under a standard unit head. It is a measure of the well's productivity and efficiency in yielding water.

2. How Does the Calculator Work?

The calculator uses the Specific Capacity formula:

Where:

• \( q \) — Pumping Rate (m³/s)
• \( s_t \) — Drawdown Inside the Well (m)

Explanation: The formula calculates the specific capacity by dividing the pumping rate by the drawdown inside the well, providing a measure of well productivity per unit drawdown.

3. Importance of Specific Capacity Calculation

Details: Accurate Specific Capacity estimation is crucial for assessing well performance, designing pumping systems, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter pumping rate in m³/s and drawdown inside the well in meters. All values must be valid (pumping rate > 0, drawdown > 0).

5. Frequently Asked Questions (FAQ)

Q1: What is a good Specific Capacity value?
A: Higher Specific Capacity values indicate better well performance. The acceptable range varies depending on aquifer characteristics and local conditions.

Q2: How does drawdown affect Specific Capacity?
A: Specific Capacity decreases as drawdown increases, indicating reduced well efficiency under higher pumping rates.

Q3: When should Specific Capacity be measured?
A: Specific Capacity should be measured during well testing and periodically monitored to detect changes in well performance over time.

Q4: Are there limitations to this calculation?
A: The calculation assumes steady-state conditions and may not account for well losses, aquifer boundaries, or time-dependent effects.

Q5: Can Specific Capacity be used for well design?
A: Yes, Specific Capacity is used in well design to determine optimal pumping rates and screen lengths for maximum efficiency.