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French Drain Gravel. French drain gravel should be washed three quarter inch minimum and as large as 1 Â½ â crushed stone. The upper 12 inches over the pipe shall be filled with native soil, to avoid having crushed stone over the perforated pipe that could damage the pipe.
1 Septic drainfield gravel specification: typically, washed gravel, 3/4 to 2 1/2 (pretty big) gravel is placed for a depth of 12 under the drain line piping (septic drain tile in some references). SEPTIC DRAINFIELD SIZE-CONTENTS: How to determine the septic drainfield size needed-table gives septic drainfield trench lengths for various soil perc rates and wastewater flows.