4 REPORT OF INVESTIGATIONS NO. 50 Special appreciation is expressed to Fred Dewitt, County Engineer; to Robert Simon and Jesse Burkett of the City of Orlando Water and Sewer Department; and to L. L. Garrett and Gene Birdyshaw of the Orlando Utilities Commission for their assistance. Appreciation is given to the well drillers in and near Orange County who furnished geologic and hydrologic data and permitted collection of water samples and rock cuttings and measurements of water levels during drilling operations, and to the grove owners, managers and caretakers who furnished data on irrigational use of water. The Board of Supervisors of the Orange Soil Conservation District and Albert R. Swartz and other members of the technical staff of the U. S. Soil Conservation Service gave much useful advice and information and provided strong support and encouragement during the course of the investigation. PREVIOUS INVESTIGATIONS Two previous investigations of the water resources of Orange County have been made. A report by the U. S. Geological Survey (1943) gives the results of a study of lakes as a source of municipal water supply for Orlando. A detailed investigation by Unklesbay (1944) deals primarily with drainage and sanitary wells in Orlando and vicinity and their effect on the ground-water resources of the area. Other investigators have included Orange County in geologic and hydrologic studies. Fenneman (1938), Cooke (1939), MacNeil (1950), and White (1958) describe the topographic and geomorphic features of Central Florida. Cole (1941, 1945), Cooke (1945), Vernon (1951), and Puri (1953) describe the general geology of Central Florida and make many references to Orange County. Sellards (1908), Sellards and Gunter (1913), Matson and Sanford (1913), Gunter and Ponton (1931), Parker, Ferguson, Love, and others (1955), D. W. Brown, Kenner, and Eugene Brown (1957), and D. W. Brown and others (1962) discuss the geology and water resources of Brevard County. Stringfield (1935, 1956) and Stringfield and Cooper (1950) investigated the artesian water in peninsular Florida, including Orange County. Collins and Howard (1928), Black and Brown (1951), Wander and Reitz (1951), and the Florida State Board of Health (1961) give information about the chemical quality of water in Orange County.