River. Between 1930 and 1935 the canal was improved to by the federal government and renamed the Intracoastal Waterway. It was improved again between 1960 and 1965 to . All three versions were subject to shoaling which reduced their depths below the specified minimum. Forming part of the northern city limits is the C-15 canal, connecting the El Rio Canal to the Intracoastal Waterway. Boca Raton pioneered an innovative means to recycle wastewater that involves selling the recycled water to golf courses, to use for irrigation. This system is called the IRIS system. Instead of pumping the nutrient laden wastewater out to sea, or under the ground into an aquifer, the IRIS system prevents nutrients from ending up in the ocean, reducing Boca Raton's impact on the problem of toxic algae blooms. Gallery See also List of people from Boca Raton Boca Raton News References Further reading 1973– Curl, Donald W. and John P. Johnson. Boca Raton: A Pictorial History. Virginia Beach, VA: Donning Company, 1990. Sally J. Ling (2005). Small Town, Big Secrets: Inside the Boca Raton Army Air Field During World War II. History Press. . External links Downtown Boca Greater Boca Raton Chamber of Commerce 1895 establishments in Florida Academic enclaves Addison Mizner Beaches of Florida Beaches of Palm Beach County, Florida Cities in Florida Cities in Palm Beach County, Florida Jews and Judaism in Florida Populated coastal places in Florida on the Atlantic Ocean Populated places established in 1895 Seaside resorts in Florida Planned communities in Florida