The impervious area for all parcels in the Village is established by the Village. The Village shall maintain an impervious area database for all parcels within the Village which will serve as the basis for determination of the number of ERUs associated with each parcel. The database will be based on available information, including geographic information systems analysis, aerial photographs, mapping information, site examination and other available information, and will be periodically updated based on available information. (Ord. MC-2-2014 § 2, 2014)