The water cycle consists of several steps: 1) Collection: There are several sources, such as from rainwater, surface (rivers, streams, lakes), groundwater.
2) Potability: potability conditions are divided into sensory (relation to the senses, must be colorless, odorless and tasteless), chemicals (SBI preset the presence and in what quantities of certain substances in water), bactericidal ( there is a high presence of bacteria allowed).
3) Storage: Bring the water to a high place to take the pressure. In Montevideo, the most important deposit is in the hill of victory.
4) Distribution: Water pressure is proportional to the height difference so that you can only supply water to lower areas. If you want to take the highest places requires the presence of a bomb. This is the case of buildings, which are needed
two tanks, one above and one below, and through that pump sends water from the tank bottom to the top and from there is distributed each apartment. The big drawback is that if power is interrupted the supply of water, which requires a power generator. 5) Drain: is done by gravity, so the pipes should have certain pending, to evacuate both solids and liquids. The evacuation must be rapid and safe. There is a dynamic system that can be unitary (no holding tank to two meters below the road that will sewage and rainwater) or separately (the rain water goes down storm drains and sewage thrown into the River Plate). The other type is the static system, ie the presence of large reservoirs that are filled with sewage and must call the barometer for the drain. These collectors consist of two caps for a better seal.
The provision for bathrooms and kitchens are given through the tap. It uses a hydraulic siphon a matter of hygiene. This acts as a stopper that holds the passage of gases and odors. 
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