Water is one of the most important commodities on planet Earth. Without it there is no life; we need to treat it carefully, because its quantity is limited. Each year, we use enormous amounts of water, which we also need to purify after use; for that purpose, we build purifying plants. They are expensive to build and maintain; therefore, we need to plan them in such a way that we lower the costs as much as possible. The final thesis researches what we need to take into consideration when building purifying plants, and how many purifying plants is it reasonable to build to cover an area of a certain population size.
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