Engineering
Five hundred years of Harz water
Long before anyone needed to cool a machine, the Harz was drained and driven by water. The Upper Harz system of ponds, ditches and adits was built to keep mines dry and wheels turning, and enough of it survives to be a World Heritage site. Our cooling argument continues it rather than inventing it.
The mines here were drained and driven by an engineered water system that still runs. We are proposing to use its descendant.
A system, not a spring
The Oberharzer Wasserwirtschaft is an engineered landscape: reservoirs, feeder ditches, and tunnels driven through rock to move water to where the ore was. It was built over centuries because ore and water are the same problem seen from two sides – you must remove the water that floods the workings, and you need water to power the machinery that removes it.
Agricola wrote it down
Georgius Agricola's De re metallica, printed in 1556, is the first systematic account of ore extraction and metallurgy, and much of it is about water: how to lift it, how to lead it away, what machines to build. It is an engineering book with drawings, made by somebody who went and looked. The line from that habit to a modern site survey is short, and we cite the book rather than decorate with it.
What survives, and what it means here
The adits still carry water. It arrives at a stable temperature year-round, because rock is a good insulator and a very large one. A steady, cool, already-flowing body of water near a site is what a cooling loop wants – and the only reason it exists is that somebody spent four centuries building it for another purpose entirely.
The claim we are careful about
The system's existence is documented and public. Whether a specific volume at a specific temperature is available to a specific building is a separate question, answered by survey and by water law rather than by heritage. On this site those source figures are marked as source data, not as our own measurements, until that work closes.
