Design a composite pipe drain of parallel grid system to be installed, the lateral is joints the collector from both sides. The laterals are of 300 m length on one side and 200 m on the other side and will installed at depth of 2 m below soil surface with slope of 0.05%. The ground water table was found at depth 1.5 m and the impermeable layer at depth 5 m below soil surface. The hydraulic conductivity is 0.75m/day. If the amount of irrigation water that must be drained 20% of the irrigated water and the infiltration water which escape is 11% of irrigated water the area must be irrigated by 30 cm per 3 days. The collector diameter is 50 cm with slope of 1%, and the number of laterals in one side is 1