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Geohydrology

Geohydrology (or hydrogeology) is the science studying underground water, focusing on its movement, distribution, quality, and interaction with soil and rock, crucial for finding, managing, and protecting water resources for drinking, irrigation, and environmental sustainability, dealing with recharge, flow through aquifers, and pollution remediation.

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Bounded confined (one boundary)

One boundary (image method) transient confined.

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Confined recovery (Horner)

Recovery (Horner) for confined aquifer.

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Leaky confined (steady)

Steady leaky confined drawdown profile.

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Leaky confined (transient)

Leaky confined transient (Hantush–Jacob fit).

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Pumping Test Analysis

Analyze drawdown vs time data from pumping tests using Theis type-curve fitting and Cooper-Jacob straight-line methods. Computes transmissivity (T) and storativity (S).

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Steady confined (Thiem)

Steady-state confined Thiem analysis: compute transmissivity (T) from two water levels, then compute hydraulic conductivity K = T/b.

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Steady-state confined (Thiem) forward

Forward Thiem model (steady confined): predict drawdown between radii from Q and K or T, with optional radius of influence R.

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Steady-state confined aquifer test

Steady confined Thiem (T, K) from two observation boreholes (drawdowns).

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Step-drawdown (Jacob)

Step‑drawdown (Jacob) well efficiency (B, C).

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Theis Confined Calculator

Versatile Theis calculator for confined aquifers: forward drawdown calculation, solve for time to reach target drawdown, or solve for distance at given drawdown. Supports multiple unit systems.

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Theis Forward Calculator

Forward Theis model: compute drawdown s(t) at distance r given known transmissivity T (m²/s), storativity S, and pumping rate Q (m³/s). Uses SI units.

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Theis Reverse (Curve Fitting)

Reverse Theis analysis: estimate transmissivity T (m²/s) and storativity S from observed drawdown vs time data at known distance r and pumping rate Q (m³/s). Uses grid search fitting.

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