170 FLORIDA GEOLOGICAL StTRVE.'--THIRD ANNUAL REPORT.
unhealthful, and as a source of danger to the city and surrounding communities.
The use of wells to carry off surface waters at this locality has been described in the preceding paper of this report (pp. 72-75).
OVIEDO.
Oviedo lies on the eastern edge of the lake region of Orange County. The region is sandy and the topography is flat to gently undulating. The country east of Oviedo is of the prevailing flatwoods type bordering the St. Johns River and Lake Jessup, and flowing wells are here obtained at comparatively shallow depths. Both flowing and non-flowing wells occur at Oviedo, depending on the local elevation.
Mr. N. J. Tanner's well about one-eighth of a mile east of the postoffice at Oviedo, located in a depression, is about I14 feet deep, two inches in diameter and is cased 75 feet. The water from this well flows just above the surface. It is a hard sulphur water and is used for irrigating purposes.
The well of Mr. A. J. McCulley is 75 feet deep, two inches in diameter and is cased 70 feet. This well was sunk by the owner in 1907. The water is reported to rise to within 14 feet of the surface. Mr. McCulley owns another two-inch well which is 73 feet deep, and is cased 68 feet. The water in this well is said to rise to within three feet of the surface. This apparent difference in head is due largely to a difference in elevation of the wells.
A two-inch well 117 feet deep, one and one-quarter miles west of Oviedo was completed for Mr. D. W. Curry in 1910 by Mr. A. J. McCulley. This well gives a good flow of sulphur water and had when measured in April, 1910, a pressure of four and one-quarter pounds, the measurement being made about five feet above the ground. The first flow in this well was encountered at a depth of 79 feet.
A well fourteen miles east of Oviedo on the Econlockhatchee Creek furnishes a flow of salt water. This well was drilled in 1907 by A. J. McCulley and is 114 feet deep, two inches in diameter and is cased 75 feet. The first flowing water, which was salty, was. found at a depth of 70 feet.
SANFORD.
Probably not less than i ,ooo wells occur in and around Sanford. These wells are used for irrigating purposes and obtain flowing