Simulations of Groundwater Flow and Particle Tracking Analysis in the Area Contributing Recharge to a Public-Supply Well near Tampa, Florida, 2002-05

Crandall, Christy A.; Kauffman, Leon J.; Katz, Brian G.; Metz, P.A.; McBride, W. Scott; Berndt, Marian P.

doi:10.3133/sir20085231

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…TANC study results are described in detail by Jagucki et al (2011) , Lindgren et al (2011) , and Musgrove et al (2011) for the EA, and by Katz et al (2007) , Crandall et al (2009) , and Jagucki et al (2009) for the UFA. Results are summarized herein for comparative purposes (Table 1 ) and for identifying key factors affecting the vulnerability of PSWs to contamination in these aquifers.…”

Section: Resultsmentioning

confidence: 99%

“…Hydrogeologic flow models and particle‐tracking were used to simulate the mixture of water of different ages produced by the selected PSWs (detailed by Crandall et al [] and Lindgren et al []). Comparison of the resulting groundwater travel‐time (age) distribution for water from the selected PSWs indicates that both are dominated by young (<10 years of age) groundwater (Figure ).…”

Section: Discussionmentioning

confidence: 99%

“…Similarly, for the UFA, the response time reflects the large proportion of young water produced by the PSW (Figure ). For nitrate, the modeled response indicates a 1‐ to 10‐year lag time between peak loading and peak concentration at the PSW (Crandall et al ). For simulated conditions of current nitrate loading from fertilizer application and land use, and accounting for denitrification rates, nitrate concentrations in the UFA PSW will likely remain in the 1 to 3 mg/L range for several decades (McMahon et al ; Crandall et al ).…”

Section: Discussionmentioning

confidence: 99%

“…Local-scale areas were based on the modeled area contributing recharge to the selected PSWs, and as a result, were different in size ( Figure 1 b and 1 d). Contributing recharge areas for the selected PSWs were delineated using particle-tracking software as described by Crandall et al (2009) and Lindgren et al (2011) . Potential sources of contaminants in both study areas are predominantly urban and industrial.…”

Section: Methodsmentioning

confidence: 99%

“…A single PSW in each aquifer, representative of construction and operational practices regionally, was selected for detailed study. Local‐scale groundwater flow models, nested within the regional‐scale models, were developed for each TANC study area (Crandall et al ; Lindgren et al ). Local‐scale areas were based on the modeled area contributing recharge to the selected PSWs, and as a result, were different in size (Figure b and d).…”

Section: Methodsmentioning

confidence: 99%

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Factors Affecting Public‐Supply Well Vulnerability in Two Karst Aquifers

Musgrove¹,

Katz

Fahlquist

et al. 2014

Groundwater

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Karst aquifers occur in a range of climatic and geologic settings. Nonetheless, they are commonly characterized by their vulnerability to water-quality impairment. Two karst aquifers, the Edwards aquifer in south-central Texas and the Upper Floridan aquifer in western Florida, were investigated to assess factors that control the movement of contaminants to public-supply wells (PSWs). The geochemistry of samples from a selected PSW or wellfield in each aquifer was compared with that from nearby monitoring wells and regional PSWs. Geochemistry results were integrated with age tracers, flow modeling, and depth-dependent data to refine aquifer conceptual models and to identify factors that affect contaminant movement to PSWs. The oxic Edwards aquifer is vertically well mixed at the selected PSW/wellfield, although regionally the aquifer is geochemically variable downdip. The mostly anoxic Upper Floridan aquifer is affected by denitrification and also is geochemically variable with depth. In spite of considerable differences in geology and hydrogeology, the two aquifers are similarly vulnerable to anthropogenic contamination. Vulnerability in studied PSWs in both aquifers is strongly influenced by rapid karst flowpaths and the dominance of young (<10 years) groundwater. Vulnerability was demonstrated by the frequent detection of similar constituents of concern in both aquifers (nitrate, atrazine, deethylatrazine, tetrachloroethene, and chloroform). Specific consideration of water-quality protection efforts, well construction and placement, and aquifer response times to land-use changes and contaminant loading are discussed, with implications for karst groundwater management.

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