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[[File:Drinking Water Sources.PNG|thumb|350px|A picture depicting different types of drinking water sources, including groundwater under the direct influence (GUDI) of surface water, which may be subject to contamination due to the influence of polluted/impacted surface water (Photo Source: Government of Ontario, 2022<ref>Government of Ontario. 2022. A guide for operators and owners of drinking water systems that serve designated facilities. 19 May 2022. Accessed 3 June 2022. https://www.ontario.ca/page/providing-safe-drinking-water-public-guide-owners-and-operators-non-residential-and-seasonal</ref>)]]
 
[[File:Drinking Water Sources.PNG|thumb|350px|A picture depicting different types of drinking water sources, including groundwater under the direct influence (GUDI) of surface water, which may be subject to contamination due to the influence of polluted/impacted surface water (Photo Source: Government of Ontario, 2022<ref>Government of Ontario. 2022. A guide for operators and owners of drinking water systems that serve designated facilities. 19 May 2022. Accessed 3 June 2022. https://www.ontario.ca/page/providing-safe-drinking-water-public-guide-owners-and-operators-non-residential-and-seasonal</ref>)]]
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To assist with the pre-development determination of site-specific water balance values, Toronto and Region Conservation Authority (TRCA) and Credit Valley Conservation (CVC) have developed the Toronto Region Source Protection Area (TRSPA) web-based application tool that provides precipitation, evapotranspiration (actual), runoff, and recharge based on outputs from the numerical models developed under the Drinking Water Source Protection Program. Note that these values are based on a regional assessment of the water balance, and may be supplanted by site-specific data or modelling.
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To assist with the pre-development determination of site-specific water balance values, Toronto and Region Conservation Authority (TRCA) and Credit Valley Conservation (CVC) have developed the Toronto Region Source Protection Area (TRSPA) web-based application tool that provides precipitation, evapotranspiration (actual), runoff, and recharge based on outputs from the numerical models developed under the Drinking Water Source Protection Program. Note that these values are based on a regional assessment of the water balance, and may be supplanted by site-specific data or modelling.  
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Take a look at the online TRSPA Water Budget Tool below, which highlights [http://www.wellingtonwater.ca/en/vulnerable-source-water-areas/water-quantity.aspx WHPA-Q (Water Quantity)] in the GTA region showcasing areas where activities that take water without returning it the SPA and/or reduce recharge can be a threat: <br>
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Take a look at the online TRSPA Water Budget Tool below, which highlights [http://www.wellingtonwater.ca/en/vulnerable-source-water-areas/water-quantity.aspx WHPA-Q (Water Quantity)] in the GTA region showcasing areas where activities that take water without returning it the SPA and/or reduce recharge can be a threat:
    
{{Clickable button|[[File:TRSPA Tool.PNG|355 px|link=https://trca.ca/conservation/drinking-water-source-protection/trspa-water-balance-tool/]]}}
 
{{Clickable button|[[File:TRSPA Tool.PNG|355 px|link=https://trca.ca/conservation/drinking-water-source-protection/trspa-water-balance-tool/]]}}

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