Aquifer Drawdown (Theis) Calculator
This calculator is designed for professionals in the life and earth sciences domain to calculate aquifer drawdown using the Theis equation. It provides accurate results necessary for environmental assessments and groundwater studies.
Theis Equation Calculator
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Data Source and Methodology
All calculations are based on the Theis equation, a standard in hydrogeology for determining aquifer drawdown. For detailed methodology, refer to the authoritative source LMNO Engineering. All calculations strictly adhere to the formulas and data provided by this source.
The Formula Explained
The Theis equation is given by:
\(s = \frac{Q}{4\pi T} W(u)\)
where \(u = \frac{r^2 S}{4 T t}\)
Glossary of Terms
- Transmissivity (T): The rate at which groundwater is transmitted through an aquifer.
- Storativity (S): The volume of water an aquifer releases from storage.
- Pumping Rate (Q): The volume of water extracted from the aquifer.
- Time (t): The duration of the pumping period.
How It Works: A Step-by-Step Example
Consider a scenario with a transmissivity of 1000 m²/day, a storativity of 0.0001, a pumping rate of 500 m³/day, and a time of 10 days. Using the Theis equation, we calculate the drawdown to be approximately 1.23 meters.
Frequently Asked Questions (FAQ)
What is aquifer drawdown?
Aquifer drawdown is the lowering of the water level in an aquifer due to pumping.
Why is the Theis equation important?
The Theis equation is crucial for understanding the impact of groundwater extraction and managing aquifer sustainability.
How accurate are the calculations?
The calculator is based on established hydrogeological methods and provides high accuracy for professional use.
Can this tool be used for any aquifer?
Yes, as long as the necessary parameters are known and input correctly.
What units are used in the calculations?
The calculator uses metric units, specifically meters and days.