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===Potential Constraints===
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===Constraints===
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Infiltration practices are not recommended:
 
<ol>
 
<ol>
<li>Shallow bedrock </li>
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<li>Where the bedrock is within 1 m below the bottom of the proposed BMP.</li>
<li>High groundwater or areas where increased infiltration will result in elevated groundwater levels, which can be demonstrated to damage critical utilities or private property. </li>
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<li>Where the seasonal high groundwater level comes within 1 m below the bottom of the proposed BMP. Or in areas where increased infiltration will result in elevated groundwater levels, which can be demonstrated to damage critical utilities or private property. </li>
<li>Swelling clays or unstable sub-soils</li>
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<li>Over swelling clays or unstable sub-soils</li>
<li>Contaminated soils or sites with high risk of contamination from onsite activities </li>
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<li>Over contaminated soils or sites with high risk of contamination from onsite activities </li>
<li> 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. </li>
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<li>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. </li>
<li> Areas where the ecology and natural hydrology are dependent upon surface water. </li>
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<li>In areas where the ecology and natural hydrology are dependent upon surface water. </li>
<li> Prohibitions and/or restriction per approved Source Protection Plans (see MOECC guidance).  
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<li>Where prohibitions and/or restrictions exist per approved Source Protection Plans (see MOECC guidance).  
</ol>  
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</ol>
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<p>Without infiltration, many LID design alternatives exist which can still capture and retain  stormwater:
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<ul>
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<li>[[Partially infiltrating bioretention]]</li>
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<li>[[Bioretention planters]]</li>
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<li>[[Rainwater harvesting]]</li>
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<li>[[Green roofs]]</li>
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</ul>
    
===Planning===
 
===Planning===
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