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,%W and drain westward to the St. Johns Marsh , aided by extensive canals , which have been constructed for agricultural use . The basin area between the ridges is general ) low and relatively flat . Drainage of the northern portion of this basin area is provided by South Prong Creek and a network of manmade canals . The central and southern portions have essentially no natural watercourses . These areas are drained by an extensive network of manmade canals and ditches that are interconnected and joined with Main Rel ef, North Relief, and South Relief Canals and discharge into the Indian River. 2 . 2 POPULATION In 2000 , the estimated countywide population was 112 , 947 , up 25 °/ from 1990 (Table 2 . 1 ) . The Treasure Coast has experienced tremendous growth since the 1960 ' s , and this trend is expected to continue . According to a FEMA Post- Disaster Recovery and Redevelopment Guide , St . Lucie County was ranked 20th of the Atlantic and Gulf Coast counties with the largest population growth rates between 1960 and 1990 . Th County' s growth rate during this time period was 256 . 4 % . Figure 2 . 1 illustrates population growth in Indian River County between 1960 and 2000 . Figure 2 . 2 illustrates the projec ed population according to University of Florida (2001 ) for Indian River County between 2010 and 2030 . Figure 2 . 1 . Population growth , Indian River County , 1960 — 2000 . 1201000 112,947 100, 000 - 80,000 00, 000 80,000 59,896 y` 60, 000 35, 992 40,000 25 ,309 20, 000 0 ll 1960 1970 1980 1990 2000 Source : University of Florida , 2001 . Figure 2 . 2 . Projected population , Indian River County , 2010 — 2030 . 200 , 000 177 ,200 1800000 167, 200 156, 400 160 , 000 1451200 140 , 000 134 , 300 120 , 000 100 , 000 2010 2015 2020 2025 2030 Source : University of Florida , 2001 . 2-2