1. What is Specific Capacity?

Specific Capacity is the quantity that which a water well can produce per unit of drawdown. It represents the well's productivity and efficiency in delivering water.

2. How Does the Calculator Work?

The calculator uses the Specific Capacity formula:

Where:

• \( Sc \) — Specific Capacity (m²/s)
• \( Q \) — Discharge rate (m³/s)
• \( CQ^n \) — Head loss in well (m)
• \( BQ \) — Aquifer loss (m)

Explanation: The equation calculates the well's productivity by dividing the discharge rate by the total drawdown (sum of head loss in well and aquifer loss).

3. Importance of Specific Capacity Calculation

Details: Specific Capacity is crucial for evaluating well performance, determining optimal pumping rates, and assessing the efficiency of water extraction from aquifers.

4. Using the Calculator

Tips: Enter discharge in m³/s, head loss in well in meters, and aquifer loss in meters. All values must be valid positive numbers.

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 Specific Capacity relate to well efficiency?
A: Specific Capacity directly measures well efficiency - a higher value means the well can produce more water with less drawdown.

Q3: Can Specific Capacity change over time?
A: Yes, Specific Capacity can decrease due to well clogging, screen incrustation, or aquifer depletion, indicating the need for well maintenance.

Q4: What factors affect Specific Capacity?
A: Aquifer transmissivity, well construction, screen design, and pumping duration all influence Specific Capacity values.

Q5: How often should Specific Capacity be measured?
A: Regular monitoring (annually or biannually) helps track well performance and identify maintenance needs before serious problems develop.