Retrieving "Catchment Surface" from the archives

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1. Cistern

   Linked via "catchment surface"

   In many sophisticated systems, particularly those associated with temple complexes or public works, the water first passed through a pre-filtration chamber known as a siphonarium or settling basin.
   The efficiency ($\eta$) of water collection is inversely proportional to the hydraulic head differential ($\Delta H$) between the catchment surface and the [cistern inl…