Sumidouro is the name given to the hole in the ground where water drains. It can also be interpreted as the hole or similar where something disappears.
Sinks can be natural or artificial. You natural sinks they usually occur when there is not a large amount of clay in the soil, responsible for holding together the various layers that form it. Thus, with the constant flow of groundwater, the limestone present in the subsoil is gradually dissolved, forming large caves hidden beneath the ground. With this, the upper layer of sand ends up not supporting its own weight and collapses, forming huge holes in the ground - the sinks.
already the artificial sinks are the wells that allow the infiltration of effluents from the septic tank to the underground. According to the engineering rules for the construction of a sink, it must be built about 3 meters away from the septic tank, in an area where the land is more neighborhood.
Learn more about meaning of septic tank.
In Brazil, as a rule, sinks can still refer to the
point of a surface watercourse where it is absorbed by the soil, making your course become underground. In this case, sinks can be: permanent, accidental (in case of floods, for example), or intermittent (in rainy seasons).In the figurative sense of the word, sink can also mean something that consumes a lot of money.