Science · 6 pages · 12 min
Why clay drains differently from sand
Clay drains slowly through tiny pores, while sand lets water pass through large ones.
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From the opening
Clay drains slowly because its particles are tiny and the pores between them are tiny, so water must creep through narrow paths. Sand drains quickly because its grains are large and the pores between them are wide enough for gravity to empty them. The opening covers tiny plates and tiny pores, why sand empties and re-airs, and texture versus soil structure.
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Inside
- Tiny plates and tiny pores
- Why sand empties and re-airs
- Texture versus soil structure
- Cracks that close when clay swells
- Where the idea stops applying
- A distinction worth keeping
Sources
- Particle size, pore size, and permeability
- The contrast between storage and drainage rate