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→Water quality
===Water quality===
===Water quality===
Take a look at the [[Green Roof: Performance]] page by clicking below for further details about STEPs collected performance results for Rainwater cistern practices located within TRCA's, CVC's and LSRCA's watersheds: <br>
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{{Clickable button|[[File:TP effluent comparison.PNG|150 px|link=https://wikidev.sustainabletechnologies.ca/wiki/Green_Roof:_Performance]]}}
Many green roofs receive only rainwater, which is relatively clean when it lands. As such green roofs can contribute contamination, most notably in [[Water quality#Nutrient|nutrient]] leaching during early establishment. Reported values of total [[phosphorus]] in green roof runoff vary from less than 0.1 ppm to over 10 ppm.
Many green roofs receive only rainwater, which is relatively clean when it lands. As such green roofs can contribute contamination, most notably in [[Water quality#Nutrient|nutrient]] leaching during early establishment. Reported values of total [[phosphorus]] in green roof runoff vary from less than 0.1 ppm to over 10 ppm.
But, in dense urban centres, green roofs are increasingly being used to receive irrigation from harvested rainwater. Current Ontario Building Code permits the use of rooftop runoff to be reused in this manner, so long as it is 'free of solids'.
But, in dense urban centres, green roofs are increasingly being used to receive irrigation from harvested rainwater. Current Ontario Building Code permits the use of rooftop runoff to be reused in this manner, so long as it is 'free of solids'.