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In previous years, chloride concentrations greater than sea level concentrations ('''19,000 mg/L''') have been observed in tributaries of the Credit River.
In previous years, chloride concentrations greater than sea level concentrations ('''19,000 mg/L''') have been observed in tributaries of the Credit River.
==Salt & LID==
[[File:Bypass bioretention.png|thumb|400px|Example of a bypass in use to limit runoff from entering into a [[bioretention]] cell BMP. (Photo Source: TRCA, 2021)]]
Since salt has deleterious effects on many plant species, there is often concern that [[plants]] in LID receiving salt laden road runoff will not fare well over time. Several design features are meant to address these risks, including:
*Selection of plants tolerant to elevated soil concentrations of salt ([[Plant lists#Plant Characteristics|Salt tolerance in plants]])
*Inclusion of [[pretreatment|sumps or forebays]] without plants that reduce loads through infiltration
*High permeability soils that allow more rapid flushing of salt from soils during rain events ([[Bioretention: Filter media|Specialized High permeable soils]])
*Perforated distribution pipes that are offset from root balls to reduce exposure during early tree establishment ([[Stormwater Tree Trenches]])
In drinking water protection areas, bypasses may be used to limit exposure to road salts during winter months where aquifers are vulnerable and ensures that any heavily-laden stormwater will "bypass" the practice and flow to the downstream street inlet to the Municipality's storm sewer system.
==Salt Alternatives==
==Salt Alternatives==