Changes

==Phosphorus Reduction==

==Phosphorus Reduction==

The performance results for [[Permeable pavement]]/[[Porous Asphalt: Life Cycle Costs]] practices, located within TRCA's watershed originate from three primary sites:  

The performance results for [[Infiltration trench]] practices, located within TRCA's watershed originate from one site:

*Kortright Centre Parking Lot

*Kortright Centre Parking Lot

The mean performance value recorded at the outlet for Permeable Pavement practices' ability to remove Total [[Phosphorus]] (TP) was calculated based on 300 separate recordings between 2005-2007, and 2010-2017 amongst the three sites previously mentioned.

The mean performance value recorded at the outlet for the Infiltration trench practice's ability to remove Total Phosphorus (TP) was calculated based on 25 separate recordings from 2013-2014 at the Kortright Centre in Vaughan, ON.

As can be seen in the corresponding boxplot, the mean performance removal efficiency of the bioretention practices monitored are not meeting the acceptable upper extent range of nutrients as of 0.03 mg/L (30 µg/L) (Environment Canada, 2004<ref name="example1">Environment Canada. (2004). Canadian guidance framework for the management of phosphorus in freshwater systems. Ecosystem Health: Science‐based solutions report no. 1–8. Cat. No. En1–34/8–2004E. </ref>; OMOEE, 1994<ref>Ontario Ministry of Environment and Energy (OMOEE), 1994. Policies, Guidelines and Provincial Water Quality Objectives of the Ministry of Environment and Energy. Queen’s Printer for Ontario. Toronto, ON.</ref>).

As can be seen in the corresponding boxplot, the mean performance removal efficiency of the infiltration trench practice monitored is not meeting the acceptable upper extent range of nutrients as it is 0.03 mg/L (30 µg/L) (Environment Canada, 2004<ref name="example1">Environment Canada. (2004). Canadian guidance framework for the management of phosphorus in freshwater systems. Ecosystem Health: Science‐based solutions report no. 1–8. Cat. No. En1–34/8–2004E. </ref>; OMOEE, 1994<ref>Ontario Ministry of Environment and Energy (OMOEE), 1994. Policies, Guidelines and Provincial Water Quality Objectives of the Ministry of Environment and Energy. Queen’s Printer for Ontario. Toronto, ON.</ref>).

The median value of the 25 samples taken was '''0.04 mg/L''' whereas the mean was ''' 0.13 mg/L''', with a '''76%''' guideline exceedance. Given the small sample size of just one practice monitored for a year with only 25 grab samples additional infiltration trenches will be required for further monitoring projects to ensure that the results collected are as accurate as possible to ensure these practices can meet federal and provincial governments' guideline requirements for TP stormwater quality.

The median value of the 25 samples taken was '''0.04 mg/L''' whereas the mean was ''' 0.13 mg/L''', with a '''76%''' guideline exceedance. Given the small sample size of just one practice monitored for a year with only 25 grab samples additional infiltration trenches will be required for further monitoring projects to ensure that the results collected are as accurate as possible to ensure these practices can meet federal and provincial governments' guideline requirements for TP stormwater quality.