Stormwater Management - SSc6 Intent Rate and Quantity - To limit disruption of natural hydrology by reducing impervious cover, increasing on-site infiltration, reducing or eliminating pollution from stormwater runoff and eliminating contaminants Treatment - To limit disruption and pollution of natural water flows by managing stormwater runoff Requirements Rate and Quantity - Implement a stormwater management plan that results in a 25% decrease in the volume of stormwater runoff from the 1.5-year 24-hour design storm Treatment - Implement a stormwater management plan that reduces impervious cover, promotes infiltration and captures and treats the stormwater runoff using acceptable best management practices (BMPs). The treatment system must be capable of removing 80% of the annual post development total suspended solids (TSS), and 40% of the average annual post development total phosphorous (TP) based on all storms below the 2-year 24-hour design storm, as outlined in EPA-840-B-92-002 The intent and requirements described on this webpage are paraphrased from the copyrighted works of the USGBC "LEED 2009 for New Construction and Major Renovations Rating System November 2008", and, the CAGBC "LEED Rating System & Addendum for New Construction and Major Renovations LEED Canada-NC version 1.0 December 2004", and are presented here strictly for informational purposes and are not intended to supplant or be used in place of the original copyrighted works.