Technical reports

This report is an overview of the analyses, findings, conclusions and recommendations prepared as part of a water supply planning process for the member governments in the Lake County Water Alliance.

This report documents a review of the Wekiva Parkway and Protection Act and subsequent updates to the district’s minimum flows and levels standards for Rock Springs and Wekiwa Springs.

The report is a re-evaluation of the minimum flows and levels (MFLs) for the Wekiva River at the State Road 46 bridge to determine whether the MFLs are still being met.

The report presents data on snail kite use of the Blue Cypress Water Management Area in 2006 and 2007.

This report documents an assessment of a portion of the Wekiva River Study Area to identify appropriate nutrient pollutant load reduction goals needed to protect ecosystem properties on the river above State Road 46 and all of Rock Springs Run with the exception of the headwater springs.

The report documents flow discharge measurement and water quality sampling of all of the spring vents in the Silver Springs spring group.

The district contracted for assistance in ground-truthing investigations and site documentation of various submerged springs and other undocumented sites that were identified as possible groundwater discharge locations by aerial thermography. This report documents the findings.

The report documents the results of an investigation of the relationship between total annual rainfall and total annual yield of the Ocklawaha River Basin. The report was prepared for discussions regarding water supply in the area.

The report documents the study to determine microbial enzyme activities along the Wekiva River, evaluate potential relationships with the water physic-chemical properties, and investigate the potential of nitrate loss via microbially mediated denitrification in the river.

The report documents the creation of a conceptual planning-level costing tool for use in determining approximate construction and operation and maintenance costs of water supply projects. The report summarizes the data used in developing the tool.

The report documents a four-year study on improving dewatering of materials dredged from Florida waterways.

The methods implemented by various researchers for measuring nutrient fluxes in sediment water-column interface are described, including benthic chambers, sediment-core incubations, pore water profiles and pore water equilibration.

The report presents construction and operation and maintenance costs associated with the development of alternative water supply sources, such as brackish groundwater, seawater, reclaimed water, and transmission and storage systems. The report is a component of the district’s water supply planning process.

The research in the report provides a basis for predictive understanding of how historical changes in land use have affected the role of terrestrial leaf litter in aquatic food webs of the Lower St. Johns River Basin.

Building on the research conducted in Special Publication SJ2008-SP14, this report examined metabolism and food web structure in stream reaches, ammonium uptake rates in urbanized waters and litter decomposition and benthic macroinvertebrate structure in streams that experience freshwater tidal flow regimes.

The model is a numerical simulation model which allows the user to estimate irrigation requires for Florida crops, soils, irrigation systems, growing season and climate conditions.

This manual presents the technical basis for the AFSIRS model and documents the computational techniques and sources of data used in the model.

The report was developed to assess corrosion rates in deep injection wells that dispose of concentrate from the demineralization of brackish water and to identify the well construction options available for the construction of these wells with the St. Johns River Water Management District.

The Agricultural Field Scale Irrigation Requirements Simulation (AFSIRS) model was developed for Florida’s water management districts by the University of Florida’s Institute of Food and Agricultural Sciences (IFAS) to provide a method to determine allocations for consumptive use permitting. The model estimates irrigation requirements for Florida crops, soils, irrigation systems and climate conditions. Since the model was originally developed, additional tasks were identified. This report documents the results of the additional tasks.

Levels of nitrate and 12 other water quality parameters were examined from published data from 56 wells in the Silver Springs springshed in an effort to locate specific regions that may be sources of elevated nitrate concentrations.

As a part of its water supply investigations, the district had this report prepared. The report investigates the major factors that influence the performance of a small-scale rainwater harvesting system in east-central Florida and to estimate the life cycle cost, including unit production cost, of a number of potential applications.

As part of its study of alternative water supplies, the district contracted for a study of the concentrate disposal from the desalination process. This report includes conceptual engineering designs and dilution modeling for a range of outfall discharge scenarios for north and east-central Florida.

The report evaluates the dynamic hydraulic response of a karst aquifer (Blue Spring in Volusia County) using innovative analyses and quantitative tools.

The report summarizes the development of a depth to water in the upper Floridan aquifer, ranking criteria for use as an additional step to the methods for estimating the likelihood of harm to native vegetation and lakes from groundwater withdrawals.

The objective of this study was to quantify the water savings associated with district irrigation restrictions between 2001 and 2004 and for potential future use in encouraging water conservation. This report documents that study.

The report documents the modeling study conducted in order to develop a technical tool for management of groundwater resources in northeast Florida.

This plan provides specific conclusions and identifies a series of recommended actions and projects to meet Putnam County’s projected water demands for 2030.

This report documents uses of domestic self-supply water using new information since the adoption of the Lake County Water Supply Plan.

This report summarizes a two-year project that examined phosphorus loading from the basin.

This report documents pilot tests to evaluate remediation of organochlorine pesticides at the restoration area.

The report documents development of the HSPF watershed model to support the development of pollutant load reduction goals of total nitrogen and total phosphorus for Lake Jesup.

This report documents the evaluation of a hydrodynamic model used to determine the potential impacts of demineralization concentrate discharges to the Indian River Lagoon and associated issues.

This report documents work between 2003 and 2005 by the St. Johns River Water Management District, in collaboration with Wetland Solutions Inc. and the University of Florida Department of Fisheries and Aquatic Sciences to evaluate the ecological health of Silver Springs. The report was prepared for the Florida Department of Environmental Protection. This report was intended to provide an assessment of land use and water quality changes in Silver Springs and a development of cause-and-effect relationships, if any, to the springs’ ecology.

Note: The main body of the report is available for download. However, the appendices are multiple large files, which contain a video, a geographic information system database and other supporting information. The appendices are available only through order of the CD by clicking the order button above.

The report documents the research to determine the minimum water levels in wetlands needed to prevent net loss of organic soils that eventually leads to subsidence of soils in the Blue Cypress March of the upper basin.

The report summarizes the field and laboratory data associated with four seasonal sediment samplings for sediment oxygen demand determinations in six lakes.

The report documents a study in support of determining minimum flows and levels for sandhill lakes.

The report was prepared as part of the district’s ongoing development of minimum flows and levels. This report describes the development of statistical models for predicting daily spring discharge time series for Apopka and Bugg springs from an assortment of auxiliary data.

The report was prepared as part of the district’s ongoing development of minimum flows and levels. This report describes the development of statistical models for predicting daily spring discharge time series.

The report discusses the global significance of nitrogen enrichment and how Florida’s environment is notably different due to two facets: the abundance of wetlands that act as effective sinks and the intrinsic vulnerability of nitrogen to pollute and transport in karstic areas.

The report documents the investigation of the feasibility of increasing recharge to the Floridan aquifer to potentially increase available groundwater as part of the district’s alternative water supply strategy investigation. Phase 1 of the project investigated increasing recharge through stormwater recharge wells in Orange and Seminole counties by assessing the water quality impact of prolonged operation of the recharge wells.

This report describes the development of statistical models for predicting daily spring discharge time series for Rock and Wekiva springs from an assortment of auxiliary data.

This report provides an update to reports done in 2004 and 2005, including new information, literature sources and peer review comments, on a baseline model used to investigate minimum flows and levels for the St. Johns River between State Road (SR) 528 and SR 46.

This report is part of the an investigation of minimum flows and levels. In response to concerns related to the possible impact of projected increases in water use on wetlands, a monitoring effort was begun to better understand the relationships between hydrology and plant community structure and hydrology and soil morphology. This report assesses the hydrologic signatures of wetland plant communities and hydric soil indicators.

The St. Johns River Water Management District is establishing minimum flows and levels (MFLs) for water bodies to define a minimum hydrologic regime to protect the water resources or ecology of an area. This report documents the work to establish MFLs for Lake Monroe.

This report summarizes existing and projected public water supply demands and to identity preferred alternatives for ensuring that future demands are met while preserving and protecting environmental resources.

The report documents analyses in setting a minimum flows regime for Blue Spring.

This report outlines a local water supply plan, investigating traditional and alternative water supply sources, for the county and its municipalities.

This report presents an evaluation on whether consideration of any water resource values warrant adoption of a minimum flow regime more stringent than a regime developed to protect manatees’ use of Blue Spring as a winter warm-water refuge under catastrophic conditions.

This report describes and documents the methodology and geographic information system (GIS) procedures used to estimate stormwater best management practices. The objective was to map the spatial distribution in a more efficient manner and to document the step-by-step GIS procedures used to complete this mapping effort.

To meet increases in demand for potable water, utilities, especially those along the coast, have an interest in the potential application of demineralization treatment technologies and the outfall to the ocean of the concentrate disposal. SJRWMD initiated this study to help utilities understand relevant outfall implementation issues. Demineralization process will be a part of the long-term water supply strategy for achieving sustainable development within at least some parts of SJRWMD Continued engineering and environmental investigations will be needed. Phase one is an oceanographic information inventory and literature review on topics relevant to ocean outfall.

This report summarizes key physical oceanographic information presented in SJ2006-SP1, with an emphasis on use to entities within SJRWMD’s service area.

This report looks at the RIB basins in Orange County, Fla. It documents various data collected from a network of observation wells and piezometers during the operation of the RIB basins, and additional data previously acquired, as a basis for demonstrating that recharge to the Upper Floridan aquifer has likely been enhanced by the operation of the RIB sites and to estimate the degree of this enhancement.

This report presents data on the snail kites that use the Blue Cypress Marsh complex and the demography of snail kites throughout central and southern Florida, a population that is declining.

This report reflects the consensus opinions of the participants in this water supply planning initiative workshop and forum process.

The report presents a numerical model of groundwater and lake flow for the Pierson area in northwest Volusia County, Fla., and simulates changes in water levels and flow rates due to changes in climatic conditions and due to anthropogenic development.

An open-source MODFLOW was developed that automatically calculates overland runoff, evapotranspiration, net groundwater recharge and anthropogenic inflows to assist in assessing likely environmental impacts of future development.

This inventory of plants and animals was conducted as part of the process to establish minimum flows and levels for the springs.

This report was prepared as part of the process to establish minimum flows and levels for water bodies.

This report documents analysis of 536 discharge measurements at Blue Spring and what affect the measuring location may have on spring discharge.

The report presents the results of a study to evaluate areas suitable for disposal of potable water byproduct in Brevard and Indian River counties.

This report presents an analysis of the relation between discharge from the Apopka spring and lake and groundwater levels. The objective of this analysis was to develop predictive equations that can be used by the St. Johns River Water Management District in models to assess impacts of proposed water resource development and land use changes.

A team of consultants evaluated the effectiveness of various water conservation techniques implemented by utilities within the service area of the St. Johns River Water Management District. This report describes the analysis conducted and presents the results.

The report documents a project that was performed to assess residential irrigation water use compared to actual needs in central Florida’s sand ridge conditions.

The report documents data collection for a year following an initial project that was performed to assess residential irrigation water use compared to actual needs in central Florida’s sand ridge conditions.

This report was prepared to provide a list of priority water bodies for which minimum flows and levels are to be established in east-central Florida to deal with the rapid growth in the area.

This report supports the Minimum Flows and Levels (MFLs) Program because the existence of rare and endemic snail species within spring boils and their runs will be considered in setting MFLs for the protection of springs.