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Canals Altered Natural Watersheds: <br /> East Central Florida's canal system drained wetlands and altered <br /> natural watersheds. Locally, this increased the amounts of fresh <br /> water, sediments, and pollutants discharged to the lagoon in <br /> stormwater runoff. <br /> � 7 <br /> Historical <br /> � ii-"` Following GI Ganal <br /> watersheds construction <br /> _APre-1920s <br /> iM <br /> } <br /> i <br /> Melbourne-Tillman <br /> Water Control <br /> t District <br /> ❑St.Johns River Basin The lagoon's historical watershed was <br /> about 572,000 acres. After the water <br /> Indian River Lagoon Basin control district's canal systems were li <br /> completed,watershed size Increased to <br /> 1.4 million acres—a 146%Increase! <br /> Stormwater Effects on the Lagoon: <br /> Today,stormwater is the largest <br /> source of pollution in the lagoon. Ift7cp ` <br /> Stormwater harms sea grass anditlyi'�1 <br /> shellfish beds by: <br /> Clouding water with eroded soils <br /> and other suspended solids, <br /> Introducing excessive nutrients <br /> from fertilizers, pet wastes and <br /> other sources that cause algae <br /> blooms. <br /> Polluting the lagoon with sediments, <br /> chemicals, oils and fuels. 4. <br /> 7' A ' 4 <br />