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Created on LEED Interpretation

ID#

li-5214

Credit NameSSc6.2 - Stormwater design - quality control
Credit CategorySustainable sites
International ApplicableYes

Rating System

LEED BD+C: New Construction, LEED BD+C: New Construction, LEED BD+C: Schools, LEED BD+C: Schools, LEED BD+C: Core and Shell

Rating System Version

v2 - LEED 2.2, v3 - LEED 2009, v2 - Schools 2007, v3 - LEED 2009, v3 - LEED 2009

Inquiry

Our project site is a University Campus in North Carolina. Part of the LEED boundary site area includes a natural forested and grassy area which we are not disturbing as part of the project. For the LEED quality point we need to capture and treat 90% of the runoff from the annual average rainfall (1" for our site-humid area) within the LEED boundary area. The SCS soil survey lists the soil type on site to be Hiwassee Loam, hydrologic soil group B. The SCS curve number for grassed pervious areas would be 61. According to Table 2.1 (runoff depth table) in SCS TR-55 (Urban Hydrology for Small Watersheds ) a 1" rainfall depth produces no runoff for curve numbers below 70. Since no runoff will be produced in this area for the 1" rainfall event, how do we show in this in LEED quality point worksheet? Show it as a non-structural BMP infiltration area?

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