J.E. Earle 1975 <p><span>This atlas consists of three maps that show the general distri</span><span>bution of dissolved solids, hardness, and orthophosphate in the streams </span><span>and lakes within the Suwannee River Water Management District. The </span><span>atlas was prepared in cooperation with the Water Management District to </span><span>provide pertinent water-quality information relating to the objectives </span><span>of the Florida State Water Resources Act of 1972. Under the provisions </span><span>of this act, the Water Management District is required to establish a </span><span>regional water-use plan, issue permits for water-use and water-resources </span><span>related construction, and authorize the export of water. The data </span><span>presented on these maps will be useful to those concerned with water </span><span>management and use, in assessing regional water quality, and in estab</span><span>lishing a base for comparison with future quality data. </span></p><p><span>The ranges of concentration shown on the maps represent maximum </span><span>concentrations in surface water during the sampling period, January 1965-</span><span>September 1970. Concentrations are plotted at the sampling sites and </span><span>are the major criteria for determining the extent of concentration </span><span>ranges. </span><span>In some cases the drainage basin boundaries are used in </span><span>defining concentration range boundaries because the quantity and quality </span><span>of surface runoff is characteristic of the environment of the basin and </span><span>may be entirely different from the runoff of adjacent basins. Within </span><span>drainage basins, individual streams and local drainage divides define </span><span>concentration boundaries. Some areas, although adjacent to each other </span><span>in the same basin, have entirely different concentration ranges. For </span><span>example, an area containing dissolved-solids concentrations in the </span><span>0-25 mg/1 (milligrams per litre) range may be adjacent to an area in </span><span>which concentrations exceed 100 mg/1, as in the southeast part of </span><span>Jefferson County. Concentration boundaries in these areas were selected </span><span>by extending each range about halfway between the two sampling sites, as </span><span>opposed to grading an intermediate range between them without supporting </span><span>data. As the data are sparse in many areas, regional concentration </span><span>patterns are generalized and local variations may be expected to exist.</span></p> application/pdf 10.3133/wri7615 en U.S. Geological Survey Dissolved solids, hardness, and orthophosphate of surface-water runoff in the Suwannee River Water Management District, Florida reports