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The underground aqueducts combine all types of water resources and miscellaneous types of waterworks, both of which cover a broad spectrum. Common types of water resources are springs, rivers, and streams (perennial or ephemeral); lakes (natural or artificial); and the aquifers (recharged or fossil unconfined or artesian). Critical environmental factors are precipitation, evaporation and proximity to mountains, which usually constitute both a better recharge area and the source of eroded porous sediments, proper as water reservoirs.
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