Dataset Information

Factors affecting public-supply well vulnerability in two karst aquifers.

ABSTRACT: 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.

SUBMITTER: Musgrove M

PROVIDER: S-EPMC4265260 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Factors affecting public-supply well vulnerability in two karst aquifers.

Musgrove MaryLynn M Katz Brian G BG Fahlquist Lynne S LS Crandall Christy A CA Lindgren Richard J RJ

Ground water 20140519

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 m ...[more]

PMID: 24841501

Similar Datasets

Project description:BackgroundEfforts to stamp dengue in many dengue endemic countries has met little success. There is a need to re-examine and understand how the public at large view the dengue prevention efforts. This study aimed to examine the demographic factors, theoretical constructs of the Health Belief Model and knowledge about dengue and how these influence the practice of dengue prevention.MethodsA national telephone survey was carried out with 2,512 individuals of the Malaysian public aged 18-60 years.ResultsThe majority (73%) of the Malaysian public had a total dengue prevention score of 51-100 (of a possible score of 1-100). Multivariate analysis suggests significant correlates of higher dengue prevention practices with demographic background, perception of susceptibility to dengue, perceived density of mosquitoes in the neighbourhood and knowledge about dengue. Households of lower income of which the majority (40.7%) were from the rural areas, were associated with the highest odds [OR = 1.33; 95%CI = 1.09-1.67; p = 0.004] of dengue prevention. Dengue prevention practices were also less likely to be undertaken in neighbourhoods where the responders perceived there is no and/or low density of mosquitoes. Dengue prevention practices are also less likely to be practiced by skilled workers [OR = 0.78; 95%CI = 0.63-0.95; p = 0.029] compared to those unemployed. Higher perceived susceptibility to dengue was associated with higher dengue prevention practices and participants with higher dengue knowledge were found to have a higher level of involvement in dengue prevention practices.ConclusionResults from the study suggest that in formulating approaches to contain dengue, strategies should be developed to cultivate dengue prevention practices among urban population and target areas with low density of mosquitoes where public perceived a less likely chance of getting dengue. Dengue prevention campaigns should focus on messages highlighting the risk of contracting dengue and education to increase knowledge about dengue.

Project description:ContextThere is limited research on what factors are most salient to implementation of evidence-based practices (EBPs) among public health agencies in public health emergency preparedness and response (PHPR) and under what conditions EBP implementation will occur.ObjectiveThis study assessed the conditions, barriers, and enablers affecting EBP implementation among the PHPR practice community and identified opportunities to support EBP implementation.DesignA Web-based survey gathered information from public health agencies. Data obtained from 228 participating agencies were analyzed.SettingState, local, and territorial public health agencies across the United States.ParticipantsPreparedness program officials from 228 public health agencies in the United States, including Public Health Emergency Preparedness (PHEP) cooperative agreement awardees (PHEP awardees) and a random sample of local health departments (LHDs).ResultsRespondents indicated that EBP is necessary and improves PHPR functions and tasks and that staff are interested in improving skills for EBP implementation. Top system-level barriers to EBP implementation were insufficient funding, lack of EBP, and lack of clarity regarding which practices are evidence based. PHEP awardees were significantly more likely to report a lack of EBP in the field, whereas LHDs were significantly more likely to report a lack of incentives. The top organizational-level barrier was insufficient staff. Most respondents indicated their agency culture supports EBP; however, LHDs were significantly more likely to report a lack of support from supervisors and leadership. Few respondents reported individual barriers to EBP implementation.ConclusionsFindings indicate an opportunity to improve dissemination strategies, communication efforts, and incentives to support EBP implementation in PHPR. Potential strategies include improving awareness of and accessibility to EBPs through targeted dissemination efforts; building organizational capacity to support EBP implementation, particularly staff capacity, knowledge, and skills; and identifying funding and incentives to promote EBP uptake and sustainment.

Dataset Information

Factors affecting public-supply well vulnerability in two karst aquifers.

Publications

Factors affecting public-supply well vulnerability in two karst aquifers.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets