Review of the St. Johns River Water Supply Impact Study Report 1 (2009) / Chapter Skim
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From page 1... ...
a separate analysis of minimum flow and level requirements for the Ocklawaha River is planned for the near future. Additionally, the WSIS does not consider the impacts of population growth that an additional water withdrawal of 262 MGD could support, as the District has no direct authority over growth and associated land use changes in the basin.
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From page 2... ...
One way of facilitating integration of the seven workgroups would be for the District to develop a conceptual framework of qualitative interactions that link various ecological and physical parameters affected by surface water withdrawals. Not only would such a framework be an important communication tool for the District, but it could also be used to better connect the field studies, models, and analyses that are part of the WSIS.
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From page 3... ...
Johns River, it evaluated salinity under different scenarios for the lower river, and it conducted a model analysis of possible changes in sediment loading in the middle river. They concluded that water stage in the lower and middle river will be relatively unchanged by surface water withdrawals.
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From page 4... ...
Johns River would change if the river stage dropped due to water withdrawals. Two groundwater flow models were used during Phase I to compute groundwater base flows along the river from the surficial aquifer system and the upper Floridan aquifer: the North Central Florida and the East Central Florida MODFLOW models.
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From page 5... ...
Biogeochemistry The biogeochemistry workgroup identified seven potential effects of additional water withdrawals on biogeochemical processes, all related to the possibility that soil accretion will be reduced and/or oxidation of organic soils will be enhanced in the extensive floodplains of the St. Johns River as a consequence of changes in river stage induced by additional water withdrawals.
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From page 6... ...
Johns River under lowflow conditions, which was not discussed in the Phase I report. Second, the Phase I report does not adequately address the type or frequency of additional water quality and biological monitoring data needed to adequately assess the impacts of water withdrawals on TMDLs and plankton.
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From page 7... ...
Littoral Zone SAV is a focus of the WSIS because the proposed surface water withdrawals are likely to exacerbate salinity intrusions in the estuarine portion of the river, which could have detrimental effects on local SAV populations. The littoral zone workgroup is assessing the potential damage to SAV from the proposed water supply withdrawals via an extensive monitoring program.
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From page 8... ...
Therefore, the wetlands workgroup is examining the potential impacts of the proposed surface water withdrawals to wetland vegetation communities and a few species of wetland-dependent fauna. Impacts range from changes in vegetation community type or structure (including species composition)
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From page 9... ...
The wetlands workgroup divided the river into nine segments deemed relatively homogeneous in terms of soils, vegetation, hydrology, water quality, and fauna. For each segment, qualitative information was provided on the relative likelihood of impacts from water withdrawals to wetlands.
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