Component: Other permeable surfaces

 

 

Description

Other permeable surfaces can include:

• Grass (if the area will not be trafficked)
• Reinforced grass
• Gravelled areas

 

The water passes through the surface to the permeable fill. This allows the storage, treatment, transport and infiltration of water.

 

Advantages and disadvantages

 

Advantages

Reduced peak flows to watercourses reducing the risk of flooding downstream Reduced effects of pollution in runoff on the environment Reduced need for deep excavations for drainage, which can have significant cost benefits Allows dual use of space, so no additional land take Removes need for gully pots and manholes Good community acceptability.

Disadvantages

Cannot be used where large sediment loads may be washed/carried onto the surface Risk of long term clogging and weed growth if poorly maintained May have some load nearing considerations.

 

 

 

 

 

 

 

Where component can be used

Residential:  Yes

Commercial/industrial:  Yes

High density:  Yes

Retrofit:  Yes

Contaminated sites:  Yes

Sites above vulnerable groundwater: Yes – if appropriate

 

Performance

Peak flow reduction:  Good

Volume reduction:  Good

Water quality treatment: Good

Amenity potential:  Poor

Ecology potential:  Poor

 

Read more on:

• Source control

• Green roofs

• Rainwater harvesting

• Pervious surfaces