For this project, the proposed condition reduces the existing impervious area by 38% below the existing condition, therefore the project received a waiver for storm water management, quantity control. Stormwater management requirements were met by reducing the existing impervious area on site. The "2000 Maryland Stormwater Management Design Manual" requires a reduction on 20% of existing impervious to meet stormwater management requirements and, in this project, an impervious area reduction of 38% was achieved. If by reducing the existing impervious area by 38%, does our project meet the requirement of the credit?
The project has reduced impervious area by 38% and seeks compliance with SSc6.1 on this basis. Peak flow rates and volume do have a relationship with impervious area. However, if a reduction in impervious area will result in compliance with the requirements of SSc6.1, than it is the responsibility of the project team to perform calculations of the pre- and post-development runoff volumes as described in the LEED-NC v2.2 Reference Guide to demonstrate that compliance. Applicable Internationally.