1. What is Thickness of Aquifer from Impermeable Layer?

The thickness of aquifer from impermeable layer refers to the vertical distance from the impermeable base of the aquifer to the initial water table level. This measurement is crucial in hydrogeology for understanding aquifer characteristics and groundwater flow dynamics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( H \) — Thickness of aquifer (m)
• \( h_w \) — Depth of Water in the well measured above the impermeable layer (m)
• \( s_1 \) — Drawdown in well 1 (m)

Explanation: The total aquifer thickness is calculated by adding the current water depth above the impermeable layer to the drawdown caused by pumping in well 1.

3. Importance of Aquifer Thickness Calculation

Details: Accurate aquifer thickness determination is essential for groundwater resource assessment, well design, pumping test analysis, and understanding aquifer storage capacity and transmissivity.

4. Using the Calculator

Tips: Enter depth of water in meters (measured from impermeable layer to water surface) and drawdown in well 1 in meters. Both values must be non-negative numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is an impermeable layer in aquifer context?
A: An impermeable layer is a geological formation that prevents or significantly restricts the flow of water, such as clay beds or solid rock formations that form the base of an aquifer.

Q2: How is drawdown in well 1 measured?
A: Drawdown is measured as the difference between the static water level (before pumping) and the pumping water level (during pumping) in the well.

Q3: Why is aquifer thickness important for well design?
A: Aquifer thickness determines the available water-bearing formation and influences well screen length placement and optimal pumping rates.

Q4: Can this formula be used for confined aquifers?
A: This formula is primarily used for unconfined aquifers where the water table represents the upper boundary of the saturated zone.

Q5: What factors can affect the accuracy of this calculation?
A: Measurement errors in depth and drawdown, well construction details, and local hydrogeological conditions can affect the accuracy of the calculation.