u/Frosty-Tale3292

This cheat sheet is by request...looking at you Colin

This cheat sheet offers a quick screening estimate for unconsolidated materials when you have hydraulic conductivity but no site-specific specific yield data.

When you need to estimate the storage coefficient and you don't have any pumping test data yet the Van der Gun method is useful and requires only the aquifer depth and thickness.

More effort and resources does not continue to add more value or benefit indefinitely. The purpose for applied groundwater models is not to replicate reality. The purpose is to help solve a specific problem.

Here is a cheat sheet on the Water-Table Fluctuation (WTF) method for estimating aquifer recharge from groundwater level data.

It includes the main equation, practical limitations, and a simple synthetic example showing how the method can be applied.

Here is a cheat sheet for estimating stream depletion for multiple streams using the Glover equation, with a real-world case study from British Columbia.

To keep the sheet short, only the Glover results are shown on the card. The full case study also compares the Hantush method and Hunt equation against field observations and numerical models.

Full case study: anaqsim.com/useful-equations/

Here is a short cheat sheet on a simple way to analyze well efficiency from step-rate test data without needing graphs.

It uses the Kasenow solution to calculate aquifer loss and well loss directly from the step data. What I like about it is that it is practical:

• no graphing
• no data transformation
• works with ordinary step-test field data
• can be used for confined or unconfined conditions
• lets you check whether B and C stay reasonably consistent from step to step

If you do step-rate testing and want a cleaner way to estimate well efficiency and well loss, this method is worth knowing. Hope you find it useful.

These cheat sheets walk through a simple, physics-based way to estimate the formation pore-pressure limit for unconsolidated soils, then turns it into an allowable head rise so you can back-calculate a maximum injection rate.

New groundwater cheat sheet: estimating a 1-in-100-year high groundwater level (Gumbel EV1, annual maxima). Simple and fast for early screening, with caveats.