That seems to be the assumption Panoramia and the Halflings were working from.<snip>
If you're discussing long-term groundwater accumulation being used as the primary source rather than having draining and annual replenishment, that kind of raises the question of whether the groundwater is still poisoned, three thousand years after the original deed. I wouldn't normally think so, but if it's not being cycled and just sitting there... what would ever clean it?
This might be the best next magical megaproject - an Aqshy powered still with a Rune of Valyra to purify water from the depths.
On-screen that's true, but in order for the Tarn to have formed as a reservoir and be usable as a sustained source of water for our agriculture there must be enough rainfall/snowfall to fill it with water and replace what we're drawing off. For that matter, heavy agriculture at all means that the climate here simply can't be upper-Andes-level arid. Why would the dwarfs ever move in to a desert in the first place?
People do farm and herd in the Andes. The Dwarves would have moved in for the minerals, the command of the pass, the sheltered location compared to the rest of the region, the defensibility and the aquifer. As to whether the water use from the tarn is sustainable, we'll see over the next few years.
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