Middle St. Johns - Florida Department of Environmental Protection

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50 Water Quality Assessment Report: Middle St. Johns Table 2.7: Freshwater Use in the Middle St. Johns Basin in 1999 (mgd) County Public Supply Domestic Self-Supply Comm./ Industrial Self-Supply Agricultural Irrigation Recreational Irrigation Power Gen. Abandoned Flowing Artesian Well Volusia 55.5 2.74 0.58 25.63 4.78 3.90 0.10 93.23 Lake 36.5 2.71 10.59 32.42 1.94 0.00 0.08 84.24 Seminole 60.08 3.89 0.09 4.53 3.80 0.00 0.16 72.55 Orange 124.37 11.87 2.83 7.90 2.46 0.64 0.08 150.15 Total for Basin Total for SJRWMD Total 400.17 543.2 92.0 127.8 344.6 32.5 25.8 3.5 1,169.4 Source: M. Dillon, 2002, SJRWMD. Water Supply Plan The SJRWMD’s District Water Supply Plan was adopted by the district’s Governing Board in April 2000 and finalized in June 2000. A large part of the basin is identified as a Priority Water Resource Caution Area (PWRCA) (Figure 2.7). The SJRWMD (Vergara, 2000a) defines PWRCAs as areas in the district where existing and reasonably anticipated sources of water and conservation efforts may not be adequate to supply water for all existing legal uses, to reasonably anticipate future needs, and to sustain water resources and related natural systems. The five constraints established for identifying PWRCAs are as follows: • Impacts to native vegetation, primarily wetlands; • Impacts to minimum flows and levels, primarily spring flows; • Impacts to ground water quality due to increased saltwater intrusion; • Impacts to existing legal users; and • Failure to identify a source of supply for future development. Saltwater intrusion is probably the most significant threat to ground water quality in the basin. Overpumping of ground water can potentially have an adverse affect on the local ground water supplies and also cause unacceptable impacts to wetlands, surface water levels, and spring flows. Anywhere from 158 to 241 mgd of additional potable water supplies will need to be developed from sources other than ground water to meet projected 2020 demands in east-central Florida (Vergara, 2000a). Investigations are under way to evaluate the use of the St. Johns River north of Lake Monroe as a water supply, through the East–Central Florida Water Supply Initiative. The St. Johns River may supply as much as 350 mgd of potable water (SJRWMD, October 7, 1999). Minimum flows and levels will also need to be developed to ensure that proposed water withdrawals will not harm the natural function of the St. Johns River. The SJRWMD has established an advisory group to solicit input from the public and experts (SJRWMD, 2001d).
Water Quality Assessment Report: Middle St. Johns 51 Figure 2.7: Portion of the Middle St. Johns Basin Included in the 1998 Priority Water Resource Caution Area Source: St. Johns River Water Management District.
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Middle St. Johns - Florida Department of Environmental Protection

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