Can there be absolutely no uncontrolled flow to achieve this credit? For example, if the required retention volume for the 95th percentile storm is 100 CF, can I oversize practices to have a storage volume of 100 CF but only capture 75% of the site within the LEED boundary? This is a situation I am running into on a historical site. I cannot add practices in certain areas within the LEED boundary.
If not, that means 100% of the area within the LEED boundary needs to drain to an LID practice for this credit no matter what percentile storm you select. For urban projects, this is pretty difficult to achieve.
Thanks in advance!