ROC is defined as the average annual runoff volume divided by the average annual rainfall. It was calculated from simulations and for CN values for the Non Directly Connected Impervious areas (in units of 5) and the Directly Connected Impervious Area (DCIA in units of 5). The BMPFast software will interpolate for CN and DCIA values not in units of 5. There are 5 of these tables, one for each meteorological zone. In a report, the information is referenced to the project name and date created. Shown is an example for zone 1, NDCIA CN = 68 and DCIA = 27%, Find ROC.