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EnglandGeologyQuick questions

Module 5: Petrology - Fluids and geological processes

Quick questions on Groundwater, aquifers and Darcy's law: porosity, permeability, the water table and groundwater flow - OCR A-Level Geology

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is calculating porosity?
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$porosity=pore volumetotal volume×100%\text{porosity} = \frac{\text{pore volume}}{\text{total volume}} \times 100\%$
What is darcy's law?
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Groundwater discharge through an aquifer is given by a simple form of Darcy's law:
What is q1?
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A rock has a total volume of 250 cm3250\ \mathrm{cm^3} and a pore volume of 50 cm350\ \mathrm{cm^3}. Calculate its porosity. [2 marks]
What is q2?
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Explain why clay has high porosity but low permeability. [2 marks]
What is q3?
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State the simple form of Darcy's law and define each term. [2 marks]

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