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| }} | | }} |
| </p> | | </p> |
− | ===Potential Constraints=== | + | ===Constraints=== |
| + | Infiltration practices are not recommended: |
| <ol> | | <ol> |
− | <li>Shallow bedrock </li> | + | <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> | + | <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> | + | <li>Over swelling clays or unstable sub-soils</li> |
− | <li>Contaminated soils or sites with high risk of contamination from onsite activities </li> | + | <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> | + | <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> | + | <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). | + | <li>Where prohibitions and/or restrictions exist per approved Source Protection Plans (see MOECC guidance). |
− | </ol> | + | </ol> |
| + | <p>Without infiltration, many LID design alternatives exist which can still capture and retain stormwater: |
| + | <ul> |
| + | <li>[[Partially infiltrating bioretention]]</li> |
| + | <li>[[Bioretention planters]]</li> |
| + | <li>[[Rainwater harvesting]]</li> |
| + | <li>[[Green roofs]]</li> |
| + | </ul> |
| | | |
| ===Planning=== | | ===Planning=== |