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*Waterproof containment can be created using a plastic membrane/liner (HDPE or EPDM are common materials).
*Waterproof containment can be created using a plastic membrane/liner (HDPE or EPDM are common materials).
**When the membrane is being used directly in the ground, punctures from stones can be prevented by compacting a layer sand (30 - 50 mm) over the soil prior to installing the plastic sheet.
**When the membrane is being used directly in the ground, punctures from stones can be prevented by compacting a layer sand (30 - 50 mm) over the soil prior to installing the membrane.
**Similarly, a 50 mm sand layer will protect the membrane from the clear stone being used for drainage inside the BMP.
*Some designs include a concrete cell to prevent infiltration. The longevity of this type of construction may be improved with a coating of liquid waterproofing compound.
*Some designs include a concrete cell to prevent infiltration. The longevity of this type of construction may be improved with a coating of liquid waterproofing compound.