Thanks for the link! These puquios look a lot like dew ponds to me and I would say there is no mystery here. Water collects on them in the mornings and runs down into the centre, automatically feeding the canal system and ultimately the plants. It is an old technique, not used much any more, to get water where there is none. They don't want the average person knowing about this technique because they are trying to uphold the perception that water is a precious resource in short supply on planet earth. Only in this way will they continually be able to pump the prices up.
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