Hydrology

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2 domain-specific abstractions whose origin domain is Hydrology.

• Pfafstetter Coding System — A hierarchical river-basin coding scheme that embeds tributary and downstream topology in numeric identifiers.
• Subsurface Flow — Movement of water through soil, sediment, and rock below the land surface as hydraulic-potential gradients act through variably saturated pore, fracture, and conduit networks, coupling infiltration and storage to recharge, discharge, runoff response, and solute transport.