Cárcamo is incorrectly written, and should be written as "carcamo" being its meaning: The basin is a hole or ditch usually square where is located the pichancha ( This is a foot valve to prevent the passage of solid to the pump that has a grid of protection ) It is placed at the end of the suction tube. And this in turn serves so that it always contains water already this built a level below the final level of the floor.