Orange County, Florida, through its Sewer and Water Department, own fifty active and ten inactive water treatment plants. These treatment plants have a total of ninety-four supply wells, sixty-four of which are actually in service. Most of these wells were obtained through purchase from private or investor owned utility companies. A file search was undertaken from records of the Orange County Sewer and Water Department, U.S. Geological Survey, former water system owners, and well drillers in order to compile all available information on these wells. Information was gathered on location, original drilling of the well, static water level and pumping tests, chemical and bacteriological quality of the water, and most recent pump, motor and auxiliary engine. This information was recorded on a date form for each well, with the well geographically categorized into five areas throughout the County. For each geographical area, mean, high and low values were determined for well and casing depth; static water level; well flow, specific pumping capacity and other flow type parameters; and various water quality parameters, such as total dissolved solids, chloride, sulfide, iron, alkalinity, and hardness concentrations. These were then compared to each other to see if any patterns could be established for wells in various areas of the County. Comparisons were also made to recorded piezometric surface levels of the Floridan Aquifer and to information in available literature on wells in the Orange County area. The comparisons indicated wells were slightly shallower in the wester part of the County than in the eastern part. Depth to static water level generally increased as you progressed from east to west, with the highest MSL elevations occurring in the southwest. Specific well capacity was greatest in the westerly area. Total dissolved solids content of the wells was much higher than that predicted by the literature, and hardness, iron and sulfide values were higher in the east than in the west.

An extensive literature survey revealed there have been no in-depth studies of the quantity of water entering Orlando area drainage wells. Previous values ranging from 30 to 85 MGD were based on water supply withdrawal information or gross drainage area estimates. This paper presents a detailed study of the quantity of water entering 208 drainage wells in the Orlando Ubran Stormwater Management Manual (OUSWMM) area. Extrapolation of results to the remaining wells in Orange County is discussed briefly. Field experiments on one 20 in drainage well yielded a mathematical relationship that was reasonable for estimating acceptance rates for drainage wells of all sizes. One hundred seventeen drainage sub-basins have been identified in the 54,000 acre OUSWMM area. Seventy-four of these sub-basins contain or contribute flow to one or more of the 208 drainage wells. Weighted mean daily runoff in the 74 sub-basins was estimated between 39.1 and 53.4 MGD. Storage effects reduce this to 17 to 31 MGD, which is the maximum quantity of runoff available to the drainage wells. Other effects could reduce this more. A well hydraulics estimate of the inflow quantity was 18 to 47 MGD. This agreed reasonable well with the estimate of the available runoff. Deviation between the two could be due to the limited amount of data on heads on the well.

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