Infiltration trench with inner inlet

The invention as well as to infiltrate the water treatment of the boiling point contaminants reduction in soil and can be reduced to the boiling point contaminants in storm runoff to contribute to raising the ground water. In addition naemeurosseo filter out impurities from the crude pretreatment significantly reduces the load on the filtration tank, as well as to improve filtration efficiency, it seeks to provide that the needle-like discharge means for preventing the inflow flooding during rainfall or when heavy rain. The present invention is a penetration ditch for injecting the treated subject included a filter medium layer including a filter material or stone, and flows into the lower ground and the infiltration gutters infiltration, comprising a step of discharging the processed during rainfall subject to a water pipe It provides a ditch.