A four-inch perforated pipe sits within a trench filled with drain rock and lined with filter fabric. The entire gravel-filled trench is positioned adjacent to a concrete structure or retaining element and is covered by planting soil over a compacted subgrade sized per civil drawings. The trench has specified clearances dimensioned at one foot in width and depth relative to adjacent site elements.
PLANTING SOIL COMPACTED SUBGRADE SEE CIVIL DRAWINGS DRAIN ROCK FILTER FABRIC 4" PERFORATED PIPE 1' - 0" 1' - 0"
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