1. What is Drawdown at the Pumping Well?

The Drawdown at the Pumping Well refers to the term applied to the maximum lowering of the groundwater table caused by pumping or artesian flow. It represents the difference between the original water level and the water level during pumping.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( s_w \) — Drawdown at the Pumping Well (m)
• \( H \) — Saturated Thickness of the Aquifer (m)
• \( h_w \) — Depth of Water in the Pumping Well (m)

Explanation: The formula calculates the drawdown by subtracting the depth of water in the pumping well from the saturated thickness of the aquifer.

3. Importance of Drawdown Calculation

Details: Accurate drawdown calculation is crucial for designing pumping systems, assessing aquifer performance, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter the saturated thickness of the aquifer and depth of water in the pumping well in meters. Both values must be positive numbers, and the saturated thickness should be greater than or equal to the water depth.

5. Frequently Asked Questions (FAQ)

Q1: What factors affect drawdown at a pumping well?
A: Pumping rate, aquifer properties, well construction, and duration of pumping all influence the drawdown observed at a pumping well.

Q2: How does drawdown affect well performance?
A: Excessive drawdown can lead to reduced well yield, increased energy costs, and potential damage to the well structure or aquifer.

Q3: What is the cone of depression?
A: The cone of depression is the area around a pumping well where the water table or potentiometric surface has been lowered due to pumping.

Q4: How can drawdown be minimized?
A: Proper well design, optimal pumping rates, and adequate well spacing can help minimize drawdown effects.

Q5: What are the units for drawdown measurement?
A: Drawdown is typically measured in meters or feet, representing the vertical distance the water level has been lowered.