Review of the St. Johns River Water Supply Impact Study Final Report (2012) / Chapter Skim
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1 Introduction
1 Introduction
Pages 11-18
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From page 11... ...
, the District historically has relied on groundwater, with the upper Floridan aquifer as the primary public supply source. As a result of its ongoing planning efforts, however, the District determined that additional water demands from the increased population could not be met by further groundwater withdrawals in the basin because those supplies are reaching their sustainable limits.
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From page 12... ...
Johns River Basin showing key features of the Water Supply Impact Study (WSIS) , including the boundaries of the subbasins, major lakes along the main stem, relevant cities and towns including Cocoa and Christmas where model simulations were run, and locations of four potential surface water withdrawal sites.
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From page 13... ...
The NRC committee will review scientific aspects of the WSIS, including hydrologic and water quality modeling, how river withdrawals for drinking water will affect minimum flows and levels in the two rivers, the impact of removing old and introducing new wastewater streams into the rivers, the cumulative impacts of water withdrawals on several critical biological targets, and the effects of sea level rise. Potential environmental impacts being considered by the District include altered hydrologic regimes in the river, increased pollutant concentrations in the rivers (e.g., sediment, salinity, nutrients, temperature)
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From page 14... ...
that would accompany the main driver for additional water withdrawals. That is, the growth in population and land use changes that would necessitate future water withdrawals from the river were not analyzed for their potential contribution to water quality degradation in the river, a fact noted in the three previous reports of this committee.
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From page 15... ...
The District subsequently developed water budgets for locations in the middle and lower river basin under varying river flow regimes. The Committee further recommended that the District continue developing these water budgets, especially for seasons and extreme flow conditions critical to the various life stages of target indicator species.
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From page 16... ...
Efforts to this effect were constrained by the limited availability of digital elevation models (DEMs) of sufficiently fine resolution and field data supporting ecologic stress due to dewatering.
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From page 17... ...
The highest elevations in the basin (up to 150-200 feet above sea level) occur to the west of the river, mainly in the sand hill region east of Gainesville, which has numerous soft-water lakes, and in the Ocala National Forest in the northern part of the Ocklawaha River basin.
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From page 18... ...
Finally, Chapter 4 discusses a number of overarching themes, including the larger context surrounding the WSIS (such as sea level rise, dredging, water quality issues, population growth and land use change, and wastewater impacts)
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