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1 Introduction
Pages 10-17

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From page 10...
... . Due partly to stakeholder concern about the shift to reliance on surface water sources, the District has embarked on an intensive study of the potential impacts of increased surface water withdrawals in the St.
From page 11...
... Introduction 11 FIGURE 1-1: The St. Johns River Water Management District.
From page 12...
... Johns River Water Management Basin and the location of six alternative water supply projects, including five surface water withdrawal sites. SOURCE: Tom Bartol, SJRWMD, personal communication, 2009.
From page 13...
... Thus, careful water supply planning is required. Water Resources Assessments The District works closely with water suppliers to ensure that adequate water supplies are available to sustainably address future demands, and it forecasts water demands for public and private needs, including domestic, agricultural, commercial, industrial, and power generation purposes.
From page 14...
... Selection of Potential Surface Water Withdrawal Sites In order to determine potential sites for public water supply withdrawal along the St. Johns River, the District employed a structured process of data assessment, feasibility evaluation, potential project selection, and quantitative water supply availability and yield analysis (CH2M Hill, 1996a, 1996b, 1997)
From page 15...
... The water quality of the lower Ocklawaha River is very good, due in large part to this substantial fresh groundwater contribution. The combination of relatively good raw water quality and significant base flow make this an attractive candidate for surface water supply development.
From page 16...
... Johns River from withdrawal of 107 MGD from the Ocklawaha River will be included. In Phase I of the WSIS, existing models and available data were used to examine potential changes in hydrology caused by withdrawals and consequential impacts on salinity, wetland soil chemistry, flora and fauna of the river channels and associated wetlands, and effects on the littoral zone.
From page 17...
... These activities include modeling of the relevant river basins, determining what criteria should be used to evaluate the environmental impacts of water withdrawals, evaluating the extent of those impacts, coordinating with other ongoing projects, and issuing a final report. 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.


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