Estimating areas contributing recharge to wells, lessons from previous studies

Franke, Oliver; Reilly, Thomas E.; Pollock, David W.; LaBaugh, James W.

doi:10.3133/cir1174

Cited by 26 publications

(8 citation statements)

References 45 publications

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“…The major conclusions would not be expected to change if dispersion were included. Transient conditions in the flow system could result in more complex areas contributing recharge and groundwater age distributions than were assessed here and should be considered in future studies [ Franke et al , 1998; Rock and Kupfersberger , 2002].…”

Section: Resultsmentioning

confidence: 99%

Simulated response of water quality in public supply wells to land use change

McMahon

Burow

Kauffman

et al. 2008

Water Resources Research

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[1] Understanding how changes in land use affect water quality of public supply wells (PSW) is important because of the strong influence of land use on water quality, the rapid pace at which changes in land use are occurring in some parts of the world, and the large contribution of groundwater to the global water supply. In this study, groundwater flow models incorporating particle tracking and reaction were used to analyze the response of water quality in PSW to land use change in four communities: Modesto, California (Central Valley aquifer); York, Nebraska (High Plains aquifer); Woodbury, Connecticut (Glacial aquifer); and Tampa, Florida (Floridan aquifer). The water quality response to measured and hypothetical land use change was dependent on age distributions of water captured by the wells and on the temporal and spatial variability of land use in the area contributing recharge to the wells. Age distributions of water captured by the PSW spanned about 20 years at Woodbury and >1,000 years at Modesto and York, and the amount of water <50 years old captured by the PSW ranged from 30% at York to 100% at Woodbury. Short-circuit pathways in some PSW contributing areas, such as long irrigation well screens that crossed multiple geologic layers (York) and karst conduits (Tampa), affected age distributions by allowing relatively rapid movement of young water to those well screens. The spatial component of land use change was important because the complex distribution of particle travel times within the contributing areas strongly influenced contaminant arrival times and degradation reaction progress. Results from this study show that timescales for change in the quality of water from PSW could be on the order of years to centuries for land use changes that occur over days to decades, which could have implications for source water protection strategies that rely on land use change to achieve water quality objectives.

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Section: Resultsmentioning

confidence: 99%

Simulated response of water quality in public supply wells to land use change

McMahon

Burow

Kauffman

et al. 2008

Water Resources Research

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“…Also, travel times along groundwater flow paths originating within the contributing areas differ as a function of distance from the well site. Water discharging from public supply wells, therefore, contains a mixture of waters of different ages that were recharged beneath various land‐use settings [18].…”

Section: Description Of Well Networkmentioning

confidence: 99%

Frequently co‐occurring pesticides and volatile organic compounds in public supply and monitoring wells, southern New Jersey, USA

Stackelberg

Kauffman

Ayers

et al. 2001

Enviro Toxic and Chemistry

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One or more pesticides were detected with one or more volatile organic compounds (VOCs) in more than 95% of samples collected from 30 public supply and 95 monitoring wells screened in the unconsolidated surficial aquifer system of southern New Jersey, USA. Overall, more than 140,000 and more than 3,000 unique combinations of pesticides with VOCs were detected in two or more samples from the supply and monitoring wells, respectively. More than 400 of these combinations were detected in 20% or more of the samples from the supply wells, whereas only 17 were detected in 20% or more of the samples from the monitoring wells. Although many constituent combinations detected in water from the supply and monitoring wells are similar, differences in constituent combinations also were found and can be attributed, in part, to differences in the characteristics of these two well types. The monitoring wells sampled during this study yield water that typically was recharged beneath a single land-use setting during a recent, discrete time interval and that flowed along relatively short paths to the wells. Public supply wells, in contrast, yield large volumes of water and typically have contributing areas that are orders of magnitude larger than those of the monitoring wells. These large contributing areas generally encompass multiple land uses; moreover, because flow paths that originate in these areas vary in length, these wells typically yield water that was recharged over a large temporal interval. Water withdrawn from public supply wells, therefore, contains a mixture of waters of different ages that were recharged beneath various land-use settings. Because public supply wells intercept water flowing along longer paths with longer residence times and integrate waters from a larger source area than those associated with monitoring wells, they are more likely to yield water that contains constituents that were used in greater quantities in the past, that were introduced from point sources, and/or that are derived from the degradation of parent compounds along extended flow paths.

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“…Physical heterogeneity may result in a high range of recharge values allowing some flow paths within the hyporheic zone to expand at variable rates. Stratified glacial sediments have a wide range of groundwater recharge values due to patchy surface exposure of gravel and till substrate (Franke et al ).…”

Section: Introductionmentioning

confidence: 99%

Focused Groundwater Controlled Feedbacks into the Hyporheic Zone During Baseflow Recession

Malzone

Lowry

2014

Groundwater

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Groundwater surface water interaction in the hyporheic zone remains an important challenge for water resources management and ecosystem restoration. In heterogeneous stratified glacial sediments, reach-scale environments contain an uneven distribution of focused groundwater flow occurring simultaneously with diffusely discharging groundwater. This results in a variation of stream-aquifer interactions, where focused flow systems are able to temporally dominate exchange processes. The research presented here investigates the direct and indirect influences focused groundwater discharge exerts on the hyporheic zone during baseflow recession. Field results demonstrate that as diffuse sources of groundwater deplete during baseflow recession, focused groundwater discharge remains constant. During baseflow recession the hyporheic zone is unable to expand, while the high nitrate concentration from focused discharge changes the chemistry of the stream. The final result is a higher concentration of nitrate in the hyporheic zone as this altered surface water infiltrates into the subsurface. This indirect coupling of focused groundwater discharge and the hyporheic zone is unaccounted for in hyporheic studies at this time. Results indicate important implications for the potential reduction of agricultural degradation of water quality.

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Estimating areas contributing recharge to wells, lessons from previous studies

Cited by 26 publications

References 45 publications

Simulated response of water quality in public supply wells to land use change

Simulated response of water quality in public supply wells to land use change

Frequently co‐occurring pesticides and volatile organic compounds in public supply and monitoring wells, southern New Jersey, USA

Focused Groundwater Controlled Feedbacks into the Hyporheic Zone During Baseflow Recession

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