PURPOSE: To effectively perform draining work for ground by a method in which water conveyance plates are radially set and connected in a trench, a water drawer fixed with an upside-opened tube is set below the water conveyance plates, the trench is embedded with soil to the water conveyance plates, a flat plate is bonded with the upside of the water drawer, and then the water drawer is buried in soil by embedment.

CONSTITUTION: Plural water conveyance plates 1W3 are radially connected with small apertures 4 among their inside edges as a water drawer on the bottom of a trench 15. An upside-opened tube 6 is fixed to the lower part of the plates 1W 3 in such a way as to form small apertures 5 between the tube 6 and the plates 2 and 3, and the end of the tube 6 is connected to a drain pipe 8 connected to the drain dich. Broken stones 16 are charged to the plates 2 and 3 to bury the trench 15, and the downside of the inside corners of flat plates 18 is bonded with the outside corners of the upside of the water conveyance plates 2 and 3 buried. Broken stones 16 are further charged into the trench 15 to bury the water drawer 7 and covered with the same soil as the ground's surface. Water exuding into the underground can be effectively collected and drained.