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The southwestern part of Seminole County-in east-central Florida-is characterized by sinkholes formed by the subsidence of surficial deposits into solution cavities in the underlying limestone deposits. The area includes three sinkhole basins created by such subsidence: Cranes Roost. Palm Springs, and Grace Lake. Cranes Roost basin (drainage area, 5.02 square miles) contains a closed drainage system of lakes and swamps-including Lakes Adelaide, Florida. and Mobile-that terminates at Cranes Roost sink. It also contains Lake Orienta and two unnamed sinks which do not overflow into Cranes Roost sink. Palm Springs basin (drainage area, 1.77 square miles) includes Lake Marion, Eleventh Hole Pond, and several small unconnected sinks. Grace Lake basin (drainage area, 1.64 square miles) includes Island Lake which overflows into Grace Lake.

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This report documents the results of a study of the cost-effectiveness of the stream-gaging program in central Florida. Data uses and funding sources were identified for the 94 continuous-record gaging stations currently being operated in central Florida with a budget of $462,000. The average standard error in estimating instantaneous discharge for the present operation is 27.8 percent. Given a budget of $550,000 the average standard error could be reduced to 17.8 percent. However, this would require that one-third of the stations be visited at a frequency greater than monthly, with the remainder being visited less frequently. The logistics required for assigning personnel and vehicles to the field at this frequency would prohibit this approach from actually being used. By limiting the maximum number of visits to 12 per year, a budget of $550,000 would reduce the average standard error to 20.2 percent. No stations were identified as unnecessary in the present network and no stations could be replaced by data simulation using alternative methods (flow routing or regression analysis). In performing the analysis, it was found that one presently operating site in the Withlacoochee River basin should be replaced with dam-monitoring equipment, and that telecommunication equipment should be placed at remote sites in the Kissimmee River basin for the purpose of determining operating status of the recorder. This report is organized into five sections; the first being an introduction to the stream-gaging activities in Florida and the present program in central Florida. The middle three sections each contain discussions of an individual step of the analysis. Because of the sequential nature of the steps

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