In the practice of irrigation, launched a taco is a small dam ephemeral made from stones, mud, weeds, and found objects. A dredger is a structure that allows you to build a taco scrolling, a structure is possible to be dragged through the channel, in the direction of the current, hence its name, and be reused in different sections, saving you time and effort. It is made of sacks cooked on a stick and the other bent stick, usually made of wicker, which acts as the handle and base structure of rigidity. The sled sits perpendicular to the channel, and is filled with stones and mud to complete it as a small dam temporary.