Changes

*[[Bioswales]] (surface)

*[[Bioswales]] (surface)

*[[Trees| Soil cells]] (surface)

*[[Trees| Soil cells]] (surface)

*[[Permeable paving| Permeable pavements]] (surface)

*[[Permeable pavements| Permeable pavements]] (surface)

*[[Dry ponds]] or infiltration basins (surface)

*[[Dry ponds]] or infiltration basins (surface)

}}

}}

==Constraints==

==Constraints==

Infiltration practices are not recommended:

Infiltration practices are not recommended:

#over-swelling clays or unstable sub-soils,

#over-swelling clays or unstable subsoils,

#contaminated soils or sites with high risk of contamination from onsite activities,  

#contaminated soils or sites with high risk of contamination from on-site activities (i.e. pollution hot spots),

#in flood prone areas where the wastewater system is sensitive to groundwater conditions causing sewer backups, and where LID BMPs have been found to be ineffective,

#on unstable or steep slopes (>15%),

#in flood prone areas where the wastewater system is sensitive to groundwater conditions causing sewer backups,

#in areas where the ecology and natural hydrology are dependent upon surface water,

#in areas where the ecology and natural hydrology are dependent upon surface water,

#in areas where increased infiltration will result in elevated groundwater levels, which can be demonstrated to damage critical utilities or private property, or

#in areas where increased infiltration will result in elevated groundwater levels that will damage critical utilities or private property, or

#where prohibitions and/or restrictions exist per approved Source Protection Plans (see MOECC guidance).

#where prohibitions and/or restrictions exist per approved Drinking Water Source Protection Plans (e.g. should not be used to treat pavement runoff within 2 year time of travel wellhead protection areas; see MOECC guidance).

<br>

<br>

Infiltration facilities should be designed with drainage modifications where:  

Infiltration facilities should be designed with modifications where:  

#the underlying bedrock is within 1 m below the bottom of the proposed BMP, or

#the underlying bedrock is within 1 m below the bottom of the proposed BMP, or

#the seasonal high groundwater level (i.e. water table) comes within 1 m below the bottom of the proposed BMP.

#the seasonal high groundwater level (i.e. water table) comes within 1 m below the bottom of the proposed BMP.

}}

}}

{{textbox|Where infiltration is impossible, LID design alternatives exist which can still capture and retain stormwater:

{{textbox|Where infiltration is impossible, LID design alternatives exist which can still capture and retain stormwater:

*[[Stormwater planters]]

*[[Stormwater planters]]

*[[Rainwater harvesting]]

*[[Rainwater harvesting]]

*[[Green roofs]]

*[[Green roofs]]

==Planning==

==Planning==

===Hydrogeology===

===Hydrogeology===

The Conservation Authorities Geoscience Group has prepared a guidance document which attempts to standardize the hydrogeological study requirements for development applications made to Conservation Authorities. It is a helpful guide for all low impact development applications which include infiltration. It is provided with the caveat that not all sections or content are necessary or appropriate for every case. Pre-consultation with your Conservation Authority and municipality is strongly recommended in all cases.  

The Conservation Authorities Geoscience Group has prepared a guidance document which attempts to standardize the hydrogeological study requirements for development applications made to Conservation Authorities. It is a helpful guide for all low impact development applications which include infiltration. It is provided with the caveat that not all sections or content are necessary or appropriate for every case. Pre-consultation with your local conservation authority and municipality is strongly recommended in all cases.  

'''[http://www.lsrca.on.ca/Shared%20Documents/permits/hydrogeological%20_guidelines.pdf?pdf=Hydrogeological-Guidelines Hydrogeological Assessment Submissions Conservation Authority Guidelines for Development Applications]'''

'''[http://www.lsrca.on.ca/Shared%20Documents/permits/hydrogeological%20_guidelines.pdf?pdf=Hydrogeological-Guidelines Hydrogeological Assessment Submissions Conservation Authority Guidelines for Development Applications]'''

==Beginning a BMP design?==

==Beginning an infiltration BMP design?==

See [[Design infiltration rates]]

See [[Design infiltration rates]]

----

----

==See also==

==See also==

*[[Groundwater]]

*[[Groundwater]]

[[category:Infiltration]]

[[category:Infiltration]]