Drainage construction structure and method for reduction of runoff in paddy fields

PURPOSE: A drainage construction structure and a drainage construction method for reducing agricultural water leakage are provided to prevent contaminants from flowing into a river connected to a drainage. CONSTITUTION: A drainage construction structure for reducing agricultural water leakage comprises a pipe member(20), a grid member, and a cover member(40). The pipe member is installed on the bottom(11) of a drainage in a longitudinal direction and has multiple through holes(21). The grid member is coupled to the pipe member and comprises multiple ribs(31) extended along the horizontal direction of the drainage. The cover member covers the pipe member and the grid member.