I am finding it difficult to locate standard CN values for BMPs. There are not many studies out there and the ones I have found have calculated large ranges for permeable pavers, green roofs etc. Has LEED generated its own runoff coefficient and Curve Number table for BMPs? I am specifically looking for values for permeable pavers and green roofs. I have found research that indicates the CN value for permeable pavers can be taken as 79 and green roof 61. If these numbers are accurate, I can meet the SSc6.1, but if they are low, than the project falls short. Any assistance is appreciated. The project is located in the City of Chicago.