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This is to mitigate risks due to short periods of groundwater mounding and potentially unobserved seasonal fluctuations. In areas where a 0.9 m separation cannot be provided, or where conditions dictate that an even greater separation may be warranted, additional discussion and/or analysis specific to the physical characteristics of the site and the proposed design should be completed.
===Target groundwater separation==
The design practitioner is advised to consult with approval agencies to understand their requirements and/or expectations prior to undertaking work, and to complete an appropriate level of analysis to support their conclusion. The requirement for additional investigation and/or documentation supporting a proposed design may be reduced in areas where ≥ 0.9 m separation is anticipated.
In many areas of Ontario the target separation between the base of an exfiltrating LID practice and the water table is 1.0 m. This is to mitigate risks due to short periods of groundwater mounding and potentially unobserved seasonal fluctuations. In areas where a 1.0 m separation cannot be provided, or where conditions dictate that an even greater separation may be warranted, additional discussion and/or analysis specific to the physical characteristics of the site and the proposed design should be completed.
The design practitioner is advised to consult with approval agencies to understand their requirements and/or expectations prior to undertaking work, and to complete an appropriate level of analysis to support their conclusion. The requirement for additional investigation and/or documentation supporting a proposed design may be reduced in areas where ≥ 1.0 m separation is anticipated.
Retention of an unsaturated zone beneath the practice :
Retention of an unsaturated zone beneath the practice :
*[[Blue roofs]].
*[[Blue roofs]].
==Sources of groundwater data==
==Oak Ridges Morraine Groundwater Monitoring Program==
[[File:ORMGP.JPG|Depth to groundwater raster and contours]]
https://oakridgeswater.ca/
The Oak Ridges Moraine focused program stretches from the Credit and Nottawasaga Watersheds in the west to the Trent River in the east and reaches from the shores of Lake Ontario northwards to beyond Lake Simcoe and the Kawartha Lakes. Within the publicly accessible maps section there is a depth to groundwater map layer.
===Other sources of groundwater data===
*[http://ontariogroundwater.com/ Ontario groundwater]
*[http://ontariogroundwater.com/ Ontario groundwater]
*[https://www.ontario.ca/environment-and-energy/map-provincial-groundwater-monitoring-network Provincial groundwater monitoring network map]
*[https://www.ontario.ca/environment-and-energy/map-provincial-groundwater-monitoring-network Provincial groundwater monitoring network map]
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