The exemplary performance requirements for SSc6.1 Stormwater Quantity and SSc6.2 Stormwater Quality listed in the LEED Green Building Design & Construction Reference Guide call for (1) a comprehensive approach to capture and treat stormwater runoff and (2) demonstrated performance above and beyond the credit requirements. To expand and clarify what these two requirements refer to, the following additional guidance is provided.SSc6.1 Stormwater QuantityTo demonstrate a comprehensive approach and performance above and beyond the credit requirements, the stormwater management strategies must:1. Address runoff from the entire development footprint of the site using Low Impact Development (LID) practices. 2. Achieve the following stormwater quantity performance:a. Case 1, Option 1: Achieve a post-development peak discharge rate and quantity that is equivalent to those calculated for the natural land cover site conditions.b. Case 1, Option 2: No EP available for his compliance path.c. Case 2: Achieve a 50% reduction in the volume of runoff during the 2-year 24-hour design storm.LID is defined as an approach to managing stormwater runoff that emphasizes on-site natural features to protect water quality by replicating the natural hydrologic regime of watersheds and addressing runoff close to its source. Examples include better site design principles such as minimizing land disturbance, preserving vegetation, minimizing impervious cover, and design practices like rain gardens, vegetated swales and buffers, permeable pavement, and soil amendments. These are engineered practices that may require specialized design assistance.SSc6.2 Stormwater QualityTo demonstrate a comprehensive approach and performance above and beyond the credit requirements, the best management practices employed must be non-structural, conforming to LID practices as defined above, and should be designed to remove at least 80% of the average annual total suspended solids (TSS) from twice the rainfall volume required for the base credit (i.e, runoff generated from 1 inch of rain in an arid climate, 1.5 inches of rain in a semiarid climate, and 2 inches of rain in a humid climate).To document compliance with these requirements, a detailed narrative or stormwater management plan summary should be provided that describes the exemplary performance approach and includes calculations that clearly highlight compliance with the exemplary performance requirements. As the exemplary performance requirements for these two credits overlap considerably, only one SSc6 EP point is available to projects. Applicable internationally.