Changes

[[File: LID_WikiGuide_is_down.PNG|thumb|This rain garden in a school yard uses stone as both decorative edging and for erosion control.]]

[[File: FILL IN |thumb|This rain garden in a school yard uses stone as both decorative edging and for erosion control.]]

[[File: IMAX_Stone_Inlet.jpg|thumb|This bioswale in a parking lot uses stone at the inlets and along the bottom of the swale to prevent erosion, as the sides are sloped.]]

[[File: IMAX_Stone_Inlet.jpg|thumb|This bioswale in a parking lot uses stone at the inlets and along the bottom of the swale to prevent erosion, as the sides are sloped.]]

For advice on aggregates used in [[Underdrains]], see [[Gravel]]

For advice on aggregates used in [[Underdrains]], see [[Gravel]]

Stone can serve as a low maintenance decorative feature, but it may also serve many practical functions in an LID practice.  

Stone can serve as a low maintenance decorative feature, but it may also serve practical functions in an LID practice.  

Typical stone functions in LID and direction on selection are provided below:  

Typical stone functions in LID and direction on selection:  

Dissipate flow and prevent erosion at inlets and outlets

Dissipate flow and prevent erosion at inlets and outlets

*Angular crushed stone, which will "knit" or lock together and be less likely to shift, is recommended, however, for aesthetic purpose smooth river run stone may be desired.

*Angular crushed stone, which will "knit" or lock together and be less likely to shift, is recommended. However, for aesthetic purpose smooth river run stone may be desired.

*The stone sizing is based on flow velocities at inlets and outlets, but typically ranges between 50 mm and 250 mm.  

*Stone size is determined by flow velocities at inlets and outlets, but typically ranges between 50 mm and 250 mm. The larger the stone,

*The thickness of the stone bed is twice that of the largest stone diameter.

*Stone bed is twice as thick as the largest stone diameter.

*To prevent erosion of soils beneath the stone and the migration of the stone into the soil, the stone bed should be underlain by a drainage geotextile.

*To prevent erosion of soils beneath the stone and the migration of the stone into the soil, the stone bed should be underlain by a drainage geotextile.

Direct and spread flow throughout a large LID facility or to protect narrow channel sections where flow will concentrate

Direct and spread flow throughout a large LID facility or to protect narrow channel sections where flow will concentrate

*While crushed stone will be less likely to shift, river run stone may be used to create a dry stream bed look.  

*While crushed stone will be less likely to shift, river-run stone may be used to create a dry-stream-bed look.  

*The sizing of the gravel will depend on the expected velocities.

*The sizing of the gravel will depend on the expected velocities.

[[Category:Materials]]

[[Category:Materials]]