Cryptosporidium parvum is a common surface water contaminant that can cause illness in human beings. The presence of this etiological agent in groundwater identifies the groundwater as under the direct influence (GWUDI) of surface water. Currently the determination of SWUDI water sources requires an expensive, labor-intensive laboratory procedure call the Microscopic Particulate Analysis (MPA). The results of the MPA provide a risk index that rates the degree of surface water contamination. The objective of this study is to identify other methods of identifying GWUDI of surface waters, such as well characteristics and hydrogeologic factors which may contribute to higher MPA risk indices. In order to determine which public water systems that are GWUDI, a total of sixty-two wells a water treatment systems suspected of be in GWUDI were investigated. The wells sampled were distributed across seven countries in the Central Florida region. Water samples were collected and analyzed at the Department of Health Laboratory in Tampa, Florida using the MPA. The study also investigated the well characteristics and the hydrogeology of the well locations. The results also showed that 13% of the wells sampled were in the high risk range while 29% and 58% of the wells sampled were within the moderate and low risk ranges, respectively. It was also observed that some well characteristics and the hydrogeology of an area generally influence the MPA risk index. The results also suggested that older well tend to have higher risk. Karst regions were observed to be susceptible to a higher risk than sandy areas.
Master of Science (M.S.)
College of Engineering
Civil and Environmental Engineering
Water Resources Engineering
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Masters Thesis (Open Access)
Sharek, Robert Christopher, "Well characteristics influencing microscopic particulate analysis risk index" (1998). Retrospective Theses and Dissertations. 2533.