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Groundwater

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Target groundwater separation
<poem>Where possible==Target groundwater separation==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, it additional discussion and/or analysis specific to the physical characteristics of the site and the proposed design should be completed. The design practitioner is recommended that [[infiltration]] BMPs maintain 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 vertical separation above the seasonally high groundwater tableis anticipated.  Retention of this an unsaturated zonebeneath the practice :
*Minimizes the potential for functional impacts associated with reduced percolation rates,
*Maintains the physical and biochemical water quality treatment benefits provided within the vadose zone,. *Minimizes the potential for localized groundwater ==Groundwater mounding to affect nearby buildings or infrastructure, and/or ==*Provides a factor-of-safety against potential uncertainties related to Groundwater mounding describes the elevation localised raising of the seasonally high groundwater elevation in areas water table beneath infiltration practices. It may be of limited monitoringconcern if it affects nearby structures including building foundations.The requirement for additional investigation and/or documentation supporting a proposed design may be reduced in areas where ≥ 1When you wish to model the extent of groundwater mounding beneath an infiltration facility.0 m separation is anticipatedThis tool uses Hantush's derivation (1967). In areas where a 1{{Clickable button|[[Media:Hantush.xlsm|Download groundwater mounding calculator(.0 m separation cannot be provided, or where conditions dictate xlsm)]]}} Note that an even greater separation may be warrantedthis is a minor adaptation (metric units and formatting) from the original tool, additional discussion written and[https://pubs.usgs.gov/sir/2010/5102/ hosted by the USGS]. ===Preventing groundwater interaction===Many LID systems rely upon reuse, or analysis specific evaporation and transpiration instead of infiltration to the physical characteristics of ground. If the site cannot support any infiltration, consider *[[Rainwater harvesting]], *[[Flow-through planters]], *[[Green roofs]], or *[[Blue roofs]]. ==Oak Ridges Moraine Groundwater Monitoring Program==[[File:ORMGP.JPG|thumb|Depth to groundwater raster and contours from the proposed design should be completedORMGP]]https://oakridgeswater. ca/ The design practitioner is advised Oak Ridges Moraine focused program stretches from the Credit and Nottawasaga Watersheds in the west to consult with approval agencies to understand their requirements the Trent River in the east and/or expectations prior reaches from the shores of Lake Ontario northwards to undertaking work, beyond Lake Simcoe and the Kawartha Lakes. Within the publicly accessible maps section there is a depth to complete an appropriate level groundwater map layer.  ===Other sources of analysis to support their conclusiongroundwater data===*[http://ontariogroundwater.com/ Ontario groundwater]<*[https://www.ontario.ca/environment-and-energy/poem>map-provincial-groundwater-monitoring-network Provincial groundwater monitoring network map]----

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