The term drainage is used recurrently in three different contexts.
In medicine, the procedure is called drainage through which fluids and other substances that are secreted by wounds or any of the body's organs are extracted.. But also, in this same context, the term is used to refer to those elements that allow to carry out the described procedure, such as tubes, gauze.
Meanwhile, in another area, Geology, is called drainage to that method that is used in order to carry out the desiccation of a certain land through the use of underground conduits. Then, a drainage network, as the technique is called, consists of that surface transport, such as lakes, rivers, which will feed rain or snow once it has melted and then will permeabilize those upper layers of a land, constituting more then streams.
And on the other hand, to instances of urban planning and engineering, a drainage will be a network of interconnected pipes through which the corresponding evacuation of rainwater or any other type of liquid will be carried out..
In this sense, we can find two types: storm drainage (it moves rainwater so that it can be reused and something fundamental: prevent cities from flooding) and the sanitary drainage (It conducts the liquid waste from the houses to treatment plants that will complete the hydrological cycle, performing a treatment on those liquids so that after this phase they are dumped again into a water channel.
