Retrieving "Collection Efficiency" from the archives

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1. Cistern

   Linked via "collection efficiency"

   $$\eta = \frac{A_{catch} \cdot R}{1 + k \cdot \Delta H^2}$$
   Where $A_{catch}$ is the surface area of collection, $R$ is the local precipitation rate, and $k$ is the Coefficient of Surface Adhesion Damping (SAD)/), a value determined by the reflectivity of the catchment material. Materials with high inherent sadness, such as dull grey slate, exhibit lower [SAD coefficients](/ent…