Case Study for Delineating a Contributing Area to a Well in a Fractured Siliciclastic-bedrock Aquifer Near Lansdale, Pennsylvania PDF Download
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Author:
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Category : Electronic government information
Languages : en
Pages : 62
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Book Description
Author:
Publisher:
ISBN:
Category : Electronic government information
Languages : en
Pages : 62
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ISBN:
Category : Groundwater flow
Languages : en
Pages : 46
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Author:
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Category : Government publications
Languages : en
Pages : 738
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Author:
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ISBN:
Category : Groundwater
Languages : en
Pages : 46
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Author:
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ISBN:
Category : Hydrology
Languages : en
Pages : 348
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Author: Forest P. Lyford
Publisher:
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Category : Hydrogeology
Languages : en
Pages : 132
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... Studied fractured-bedrock aquifer systems in West Newbury (in the Eliot Formation), Maynard (in the Nashoba Formation), and Paxton (in the Paxton and Littleton Formations) to advance methods of data collection and analysis for delineating contributing areas to public-supply wells completed in fractured rock and for determining the effects of pumping on streams and wetlands ...
Author:
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Category : Wellheads
Languages : en
Pages : 166
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Category :
Languages : en
Pages : 376
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Approximately one third of the U.S. population uses public supply wells (PSWs) as their drinking water source and recently a greater focus has been placed on assessing the risk of contaminants entering PSWs. Among the many contaminants of concern are chemical and microbiological indicators of wastewater contamination. This research project used a variety of field methods to better understand the primary mechanisms that control the transport of human enteric viruses and other wastewater contaminants in bedrock multi-aquifer systems and to develop effective methods for assessing the vulnerability of PSWs in such settings. At a field site in Madison, WI, borehole investigations suggest that fractures in siliclastic bedrock are important transport pathways from the surface to the deep aquifer. Some fractured intervals have transmissivity values several orders of magnitude higher than non-fractured intervals. In a siliciclastic aquifer near a public supply well, fractures may have an important role in the transport of sewer-derived wastewater contaminants. Reverse water-level fluctuations (RWFs), a phenomenon in which water levels rise briefly in response to pumping, were detected in monitoring wells. Data from pressure transducers located at varying depths and distances from a PSW suggest that the RWFs propagate rapidly through fractures to influence wells hundreds of meters from the pumping well. The rate and cycling frequency of pumping is an important factor in the magnitude of RWFs. The pattern of RWF propagation can be used to better define fracture connectivity in an aquifer system. Time sequenced sampling for geochemical wastewater indicators and human enteric viruses is a useful tool for characterizing transport within an aquifer system. There is an apparent connection between recharge events and increased flow in sanitary sewers and, based on limited data, these increased wastewater flows appear linked with virus detection in groundwater at short times after these events. In order to accurately assess the vulnerability of PSWs to near surface contaminants it is important to characterize fracture flow and the impact of PSW pumping. The use of RWFs to determine fracture connectivity is an important method to accomplish this goal.
Author: Sharon E. Kroening
Publisher:
ISBN:
Category : Earth sciences
Languages : en
Pages : 122
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Author: Adrian M. Harvey
Publisher: Geological Society of London
ISBN: 9781862391895
Category : Science
Languages : en
Pages : 258
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Alluvial fans are important sedimentary environments. They trap sediment delivered from mountain source areas, and exert an important control on the delivery of sediment to downstream environments, to axial drainages and to sedimentary basins. They preserve a sensitive record of environmental change within the mountain source areas. Alluvial fan geomorphology and sedimentology reflect not only drainage basin size and geology, but change in response to tectonic, climatic and base-level controls. One of the challenges facing alluvial fan research is to resolve how these gross controls are reflected in alluvial fan dynamics and to apply the results of studies of modern fan processes and Quaternary fans to the understanding of sedimentary sequences in the rock record. This volume includes papers based on up-to-date research, and focuses on three themes: alluvial fan processes, dynamics of Quaternary alluvial fans and fan sedimentary sequences. Linking the papers is an emphasis on the controls of fan geomorphology, sedimentology and dynamics. This provides a basis for integration between geomorphological and sedimentological approaches, and an understanding how fluvial systems respond to tectonic, climatic and base-level changes.
