In my region, the DP requires that the major storm system be designed to convey runoff from the 1:100yr event (and minor system to convey the 1:5yr event). Acknowledging that 1:100yr is a statistic probability of that storm, the systems are nonetheless designed to manage the amount of precipitation that would exceed any lesser events.

Would our design, then, meet the SSc6.2 requirement to prevent post-development peak discharge rate and quantity for the smaller 1 and 2yr storms? Or, does LEED require that we manage two(2), 1:100 year back to back events?