Credit 6.1- Storm water Design: Quantity Control
SS6.1 is submitted in the design phase, earning one point, with the civil engineer as the primary decision maker in leading the process. Intentions include limiting the disruption of natural hydrology, increasing on-site filtration, managing storm water runoff, and eliminating sources of contaminants. Reducing the impervious cover, eliminating pollution and removing pollutants from storm water runoff are among the other goals.
If imperviousness is less than or equal to 50%, the post-development peak discharge rate must be less than or equal to the pre-development rate. Projects can also implement a stream channel protection strategy to receive the credit. If the existing imperviousness is greater then 50%, the storm water management plan must show a 25% decrease in volume in order to receive the credit. The cost of earning this credit relies heavily on the size of the site, as well as what types of structural controls you employ. Local weather patterns will have a significant impact on cost as well.
(Source: -NC 2. 2 Reference Guide)