- Precipitation volume for which the stormwater infrastructure has been designed.
- Strategies adopted to manage stormwater beyond its designed limits.
- Trend-line showing reduction in stormwater flooding events over past five years.
- Strategies adopted to inspect and ensure maintenance of existing stormwater facilities.
References: LEED v4 ND GIB Credit: Rainwater Management SITES v2 Water Prerequisite 3.1: Manage Precipitation on Site LEED v4.1 BD+C SS Credit: Rainwater ManagementOR
Reference: STAR NS-1 Green Infrastructure, Outcome 1For cities or communities following Case 2 of Option 1 or Option 2, adopt techniques2 to infiltrate, evapotranspirate, collect and reuse water for areas such as pavements, walkways, parks, open spaces and others within the city.
1 Flood is the overflowing of the normal confines of a stream or other body of water, or the accumulation of water over areas that are not normally submerged. Floods include river (fluvial) floods, flash floods, urban floods, pluvial floods, sewer floods, coastal floods, and glacial lake outburst floods. https://www.ipcc.ch/pdf/special-reports/srex/SREX-Annex_Glossary.pdf , Accessed on December 17, 2018.
2Examples of acceptable techniques to achieve above requirements: • Planting rain gardens with native or adapted plant material (e.g. trees shrubs); • Installing a vegetated roof; • Using permeable paving, consisting of porous above-ground materials (e.g., open pavers, engineered products), a base layer designed to drain water away from the building, and (often) a 6-inch-deep (150 millimeters) subbase; and • Installing permanent infiltration or collection features (e.g., vegetated swale, rain garden, rainwater cistern) that can retain 100% of the runoff from at minimum, the 80th percentile of regional or local rainfall events. Cities may also refer to Urban Best Management Practice Database and Codes by Maryland Department of Environment that provides a list of BMPs under the category of environmental site design, structural and other practices. https://mde.maryland.gov/programs/water/stormwatermanagementprogram/documents/Urban%20BMP%20Database%20for%20Phase%20II%20MS4s%202016.pdf. Accessed on March 01, 2019.
© Copyright U.S. Green Building Council, Inc. All rights reserved.