PURPOSE: To construct a drainage quickly and simply by burying a porous, cylindrical molding in penetration from a sand layer, at the surface to its underlying layer, putting a cap on the hollow top of the molding, and scattering sand over the cap.

CONSTITUTION: A porous, cylindrical molding 1 is buried in penetration from a sand layer 21 at the surface to a non-permeative layer 23 lying under the layer 21, and a cap 3 is set on the hollow top part 2 of the molding. The cap 3 may be installed after burying. Sand is scattered over the buried object. To provide a drainage for a banker, etc., of a golf course, the molding should be made using fibers in a fibrosity of 10-1000d/f and a burying density of 0.3-20 m/piece, and also the burying should preferably be made at no more than 30deg. to the plumb.