Waters suggested to save Peru from shortage with help doinksky water supply systems

It constructed 14 centuries ago, and still it is possible for them polzovatsyaucheny investigated system of distributions of water from the mountain rivers, Peru about 600, long before emergence of the empire of Incas. They came to a conclusion that this system is still quite suitable to accumulate water during a season of rains and to supply with it the cities during a droughty season...