|style="text-align: center;" |'''<u><span title="Note: 2. Runoff reduction estimates are based on differences in runoff volume between the practice and a conventional impervious surface over the period of monitoring." 45%*</span></u>'''
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|style="text-align: center;" |[https://sustainabletechnologies.ca/app/uploads/2016/02/KPP-Ext_FinalReport_Dec2015.pdf/ Van Seters and Drake (2015)]
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|style="text-align: center;" |[https://bit.ly/2Fme59s/ Van Seters and Drake (2015)]