Chapter 7.5 - Roof Dripline Filters - MaineBMP Components: The roof dripline filtration BMP consists of the following layers in ascending depth order: a reservoir layer of crushed stone, a drainage layer.crushed stone filter,Material Specification 521—Aggregates for Drainfill and FiltersQuality. Drainfill and filter aggregates shall be sand, gravel, or crushed stone or mixtures thereof. Aggregates shall be composed of clean, hard, durable, mineral.Filter Drain - Standard Detail Drawing & Specification . - Paths for AllFeb 1, 2012 . Lay minimum 50mm depth of filter medium along the trench base. . material (clean as dug gravel with no fines, clean crushed concrete or railway . remaining 100mm depth of trench with filter medium to finish stone level with.
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