Compound french drain

The utility model discloses a compound french drain. Wherein be provided with main french drain on the brickbat tamp layer, the collector pipe is placed in main french drain, and it has the cobble loaded filter to fill between main french drain and the collector pipe, and one side of main french drain is provided with inverts the isosceles trapezoid french drain, inverts the intussuseption of isosceles trapezoid french drain and is filled with the cobble loaded filter, be provided with geotechnological cloth on the up end of main french drain and inversion isosceles trapezoid french drain, the upper portion of geotechnique's cloth is provided with the pea gravel concrete layer, and the upper portion on pea gravel concrete layer is provided with the concrete floor, main french drain passes through the french drain articulamentum with inversion isosceles trapezoid french drain and links to each other, and the intussuseption of french drain articulamentum is filled with the rubble. Increasing, deepening along wi