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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.  
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**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.  
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**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.
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