Liner
Revision as of 21:17, 4 March 2022 by Dean Young (talk | contribs)
An impermeable liner is incorporated into non-infiltrating practices such as stormwater planters, and may be applied in permeable pavements installations where separation from the native soils and groundwater is required.
- Waterproof containment can be created using concrete or 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 membrane.
- Alternatively, a manufactured cushion fabric (geotextile) can be employed for this purpose.
- The top surface of the membrane must also be protected from stone and gravel being used for inside the BMP. Again, sand or a cushion fabric may be used.
- When a pipe is used to provide drainage from the practice to an outlet structure or storm sewer, a 'pipe boot' or flange should be sealed to both the pipe and the liner to prevent leaks.