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21 <br />• <br />METHOD 1 - <br />Number of systems in a given area (WQCA or watershed) = Percentage of square miles of non - <br />municipal county land in that area times the estimated total number of systems in Orange County <br />(19,000) <br />EXAMPLE: For Cane Creek Water Quality Critical Area <br /># SYSTEMS = 2.004% * 19,000 or 381 <br />METHOD 2 - <br />Number of systems in a given area (WQCA or watershed) = Overall number of persons per <br />square mile in non - municipal Orange County (117.4) times the number of square miles in that <br />given area divided by the average number of persons per household in Orange County , <br />EXAMPLE: For Cane Creek Watershed <br /># SYSTEMS = 117.4 * 29.2 _ 2.24 or 1530 <br />• <br />