This report is the second from the National Research Council (NRC) Committee to Review the St. Johns River Water Supply Impact Study, which is providing ongoing advice to the St. Johns River Water Management District (the District) as it considers withdrawing additional water from the St. Johns River in east-central Florida for future public supply (see the Statement of Task in Box 1). In its first report (NRC, 2009), published in August 2009, the committee gave a series of recommendations, some broad and others specific to the seven scientific workgroups that are conducting the Water Supply Impact Study (WSIS).

A major focus of the committee’s subsequent meeting in Orlando, FL (September 30-October 2, 2009) was the District’s responses to the August report. In addition, several conference calls were held with District scientists during which they explained how they are responding to NRC (2009). This report expresses the committee’s thoughts and opinions on the District’s efforts in that regard and is targeted at the District scientists that have conducted the WSIS. The committee wishes to acknowledge the significant extent to which the District has taken the committee’s advice. Much of this report focuses on particular areas where the committee concludes that additional or continued attention and work are warranted. Thus, not every issue found in NRC (2009) that is being adequately managed by the District is mentioned in this report. Furthermore, because of its intended audience and the interim nature of its advice, this report does not contain background material about the WSIS or the seven workgroups. Rather, the reader is referred to NRC (2009) for work conducted prior to May 2009. Progres ssince May 2009 can be derived from the District’s website for the WSIS (http://sjrwmd.com/surfacewaterwithdrawals/impacts.html), includ ing presentations from thepublic symposium held September 23-24, 2009, in Gainesville, FL.