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The Island’s storm water system is made up of a complex network of interconnected public and private conveyances for surface water. The system serves 88 separate drainage basins. The major components of the system include more than 15 miles of natural watercourses, 60 percent of these are privately owned; 26 miles of open drainage ditches, 70 percent of which are on public property; 58 miles of public storm drains; 59 miles of private storm drains; more than 4,500 City owned catch basins; and over 3,300 non City owned catch basins.