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11.0 EROSION PROTECTION DESIGN 11.1 Riprap
open.alberta.ca15 FILTER ≥ 5 to provide adequate drainage. D ... a zone of filter sand must be provided to separate the fill ... 13-2, and 18-1, and adjacent to structures where the underslab granular drainage material drains through a vertical drainage blanket adjacent the sidewalls as shown on Figure 17-9. At these critical locations, geotextiles must