1. What is Well Loss Given Drawdown?

Well Loss Given Drawdown refers to the head loss in a well, which is essentially the difference between the head of the aquifer immediately outside and in the well due to various losses during pumping.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Head Loss in well — Difference in head due to losses (Meter)
• Total Drawdown — Reduction in water level from static level (Meter)
• Aquifer loss — Product of discharge and aquifer loss coefficient (Meter)

Explanation: This formula calculates the head loss specifically in the well by subtracting the aquifer loss from the total drawdown observed.

3. Importance of Head Loss Calculation

Details: Accurate calculation of head loss in wells is crucial for understanding well efficiency, designing pumping systems, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter Total Drawdown and Aquifer loss values in meters. Both values must be non-negative numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: What factors contribute to well loss?
A: Well loss can be caused by various factors including screen entrance losses, turbulence in the well, and friction in the well casing.

Q2: How is aquifer loss different from well loss?
A: Aquifer loss occurs in the formation around the well due to laminar flow, while well loss occurs within the well itself due to turbulent flow and other factors.

Q3: What are typical values for well loss?
A: Well loss coefficients typically range from 0.5 to 10 seconds²/m⁵, with lower values indicating more efficient wells.

Q4: How can well loss be minimized?
A: Proper well design, adequate screen area, proper development, and maintenance can help minimize well loss.

Q5: Why is it important to separate aquifer loss from well loss?
A: Separating these losses helps in evaluating well performance and determining whether well rehabilitation is needed to improve efficiency.