A road ditch cross-section incorporates a central grouted rock riprap pilot channel measuring 300 millimeters wide by 150 millimeters thick. The channel bed rests on a layer of geotextile fabric for permanent erosion control. Side slopes grade at a 2 to 1 ratio with a two percent cross-slope toward the center. Notes specify installing the pilot channel for road ditches with longitudinal slopes greater than five percent, with riprap conforming to section 31 00 00 earthwork specifications.
1 2 1 1000 780 780 390 NOTES: 1. INSTALL PILOT CHANNEL FOR ROAD DITCHES WITH LONGITUDINAL SLOPES GREATER THAN 5%. 2. 150 THICK GROUTED ROCK RIPRAP WILL CONFORM TO SECTION 31 00 00 EARTHWORK SPECIFICATIONS AND WILL MEET THE GRADATION 2 2% 2% 300 150 GEOTEXTILE FABRIC GROUTED ROCK RIPRAP PILOT CHANNEL FOR PERMANENT EROSION CONTROL
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