Ground-water resources of Cambrian and Ordovician carbonate rocks in the valley and ridge physiographic province of Pennsylvania

Becher, Albert E.

doi:10.3133/ofr90109

Cited by 3 publications

(3 citation statements)

References 21 publications

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“…Hydraulic conductivities were tested via trial‐and‐error based on values from previous studies (Becher, 1996; Brachet, 2005; Fulton et al., 2015; Gannett Fleming, 2008; Parizek & Filley, 1982) and hand‐drawn conductivity zones used to closely reflect that of Chin (1996) and the water table of Taylor (1997). Over 100 iterations of the model were used to obtain the results of our groundwater flow model with the assumption that the diffuse flow is the dominant flow regime in the overall geologic unit even though likely areas of turbulent conduit flow within the karstic units exist.…”

Section: Methodsmentioning

confidence: 99%

Numerical modeling of groundwater flow and nitrate transport in karst and wastewater irrigated agricultural and forest landscapes, PA, USA

Daniel,

Richendrfer,

Falta

et al. 2023

Agrosystems Geosci & Env

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Understanding the influence of treated wastewater reuse for irrigation on nitrate groundwater contamination in karstic landscape is critical for developing long‐term management plans and assessing the sustainability of these practices. The Pennsylvania State University has been operating a secondary treated wastewater effluent irrigation site—the “Living Filter”—since the 1960s. The objective of this study is to develop a regional groundwater flow and nitrate transport model to assess the impact of treated wastewater and disposal of large volumes of wastewater for irrigation of agricultural and forested lands on nitrate groundwater contamination in a karst landscape in the Spring Creek Watershed in central Pennsylvania. The modular three‐dimensional finite‐difference ground‐water flow model (MODFLOW) was used to construct the groundwater flow model of the local aquifer and simulate three‐dimensional regional changes in the water table over time. The simulation of nitrate fate and transport in the aquifer was conducted by developing a groundwater mass transport model using MODFLOW and a modular three‐dimensional transport multi‐species model (MT3DMS). The calibrated groundwater model yielded a root mean square error of 5.41 ft for the area of irrigation and 24.67 ft for the entire modeled area. Results of the calibrated model show the extension of a nitrate plume over most of the study area with concentrations below 10 mg·L−1 under the current 2015 setting and the long‐term 2035 scenario of increased irrigation rates. The nitrate migration was dominated by the presence of two high conductivity groundwater troughs adjacent to the study area resulting in a near steady‐state total mass since the 1990s.

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Section: Methodsmentioning

confidence: 99%

Numerical modeling of groundwater flow and nitrate transport in karst and wastewater irrigated agricultural and forest landscapes, PA, USA

Daniel,

Richendrfer,

Falta

et al. 2023

Agrosystems Geosci & Env

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“…None of the detections exceeded the USEPA drinking-water guidelines except for water from one well that was used only for irrigation purposes. Another ground-water study by Becher (1996) analyzed waters from a network of wells and springs for a broad suite of constituents including seven herbicides (alachlor, atrazine, cyanazine, metolachlor, propazine, simazine, and toxaphene). Alachlor, atrazine, and simazine were the only herbicides detected in samples.…”

Section: Previous Investigationsmentioning

confidence: 99%

“…Of the five selected pesticides, MCL's have been established only for atrazine and simazine (table 7). The data for this study are listed in the USGS annual water-data reports (Durlin and Schaffstall, 1994;1996;.…”

Section: Concentrations Of Selected Pesticidesmentioning

confidence: 99%

Summary of and factors affecting pesticide concentrations in streams and shallow wells of the lower Susquehanna River basin, Pennsylvania and Maryland, 1993-95

Hainly¹,

Zimmerman²,

Loper³

et al. 2001

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Information regarding the National Water-Quality Assessment (NAWQA) Program is available on the Internet via the World Wide Web. You may connect to the NAWQA Home Page using the Universal Resource Locator (URL) at: http://wwwrvares.er.usgs.gov/nawqa/nawqa_home.htmlThe NAWQA Program recognizes that a national assessment by a single program cannot address all water-resource issues of interest. External coordination at all levels is critical for a fully integrated understanding of watersheds and for cost-effective management, regulation, and conservation of our Nation's water resources. The Program, therefore, depends extensively on the advice, cooperation, and information from other Federal, State, interstate, Tribal, and local agencies, nongovernment organizations, industry, academia, and other stakeholder groups. The assistance and suggestions of all are greatly appreciated.

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Ground-water-quality data in Pennsylvania: A compilation of computerized [electronic] databases, 1979-2004

Low¹,

Chichester²

2006

Data Series

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Ground-water resources of Cambrian and Ordovician carbonate rocks in the valley and ridge physiographic province of Pennsylvania

Cited by 3 publications

References 21 publications

Numerical modeling of groundwater flow and nitrate transport in karst and wastewater irrigated agricultural and forest landscapes, PA, USA

Numerical modeling of groundwater flow and nitrate transport in karst and wastewater irrigated agricultural and forest landscapes, PA, USA

Summary of and factors affecting pesticide concentrations in streams and shallow wells of the lower Susquehanna River basin, Pennsylvania and Maryland, 1993-95

Ground-water-quality data in Pennsylvania: A compilation of computerized [electronic] databases, 1979-2004

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