Assessing Safe Yield for Supply Wells in an Aquifer with Fresh Water .


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Assessing Safe Yield for Supply Wells in an Aquifer with Crisp Water/Salt Water Interface. SWIM 2008. Gregory Nelson 1 , Liliana Cecan 1 , Charles McLane 1 , and Maura Metheny 1 McLane Ecological, LLC, Princeton, NJ USA. Presentation. Safe Yield
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Slide 1

Assessing Safe Yield for Supply Wells in an Aquifer with Fresh Water/Salt Water Interface SWIM 2008 Gregory Nelson 1 , Liliana Cecan 1 , Charles McLane 1 , and Maura Metheny 1 McLane Environmental, LLC, Princeton, NJ USA

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Introduction Safe Yield Aquifer Characterization for Safe Yield Analysis Delineation of the Fresh Water/Salt Water Interface Characterization of the Density Distribution Characterization of the Horizontal and the Vertical Hydraulic Conductivity Salinity Impact Safe Yield Analysis (Case Study) Site Geology Aquifer Characterization Traditional Safe Yield Salinity Impact Safe Yield Conclusions/Recommendations

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Safe Yield Safe Yield: Manage the water asset by striking a harmony between taking care of group water requests while keeping away from injurious hydrologic and ecological effects Typical Methods Specific limit Long-term pumping test (5 – 10 days) Hydrologic affect limits

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Safe Yield for a Coastal Aquifer A protected yield examination in beach front settings ought to mull over saltiness impacts created by pumping Requires more nitty gritty aquifer portrayal Requires use of a saltiness transport display

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Aquifer Characterization Delineation of the Fresh Water/Salt Water Interface and Density Distribution Density appropriation and a precise outline of the new water/salt water interface some time recently, amid pumping stage and amid recuperation period of a pumping test yield imperative data in deciding a sheltered yield for the well field

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Aquifer Characterization of the Horizontal and the Vertical Hydraulic Conductivity Salt water interruption and upconing is touchy to flat and vertical pressure driven conductivity Low vertical pressure driven conductivity underneath the pumping great will hose upconing Method: "Pumping Test Analyses in an Aquifer with Fresh Water/Salt Water Interface" – Liliana Cecan

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Safe Yield Analysis (Case Study) Cape Cod Site Geology Glacial dregs saved in a lacustrine deltaic framework 15,000 years back (Oldale 1992) Glacial silt develop 900 ft subterranean surface to crystalline bedrock (Masterson 2004) Aquifer framework is made out of a few new water focal points – the site lies in the Pamet Lens (Walter and Whealan 2004) Average energize is 24 in/yr (Masterson 2004) Groundwater stream is outspread toward the Atlantic Ocean (East), Cape Cod Bay (West), Pilgrim Lake (North), and Herring River (South)

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Safe Yield Analysis (Case Study) Aquifer Characterization salt water interface move zone limits

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Safe Yield Analysis (Case Study) Aquifer Characterization

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Safe Yield Analysis (Case Study) Aquifer Characterization

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Safe Yield Analysis (Case Study) Traditional Safe Yield Available drawdown ( dd ): 20 ft Specific limit ( SC ): 35 gpm/ft dd Safe Yield rate: SC x dd = 700 gpm ≈ 1 MGD

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Safe Yield Analysis (Case Study) Salinity Impact Safe Yield A pumping rate of 1 MGD causes fouling of the well inside 50 yrs A pumping rate of 0.7 MGD causes upconing, yet the focus does not surpass the MCL

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Conclusions/Recommendations Despite a developing consciousness of salt water interruption and upconing, safe yield pumping rate controls still don\'t require appraisal of potential saltiness impacts brought about by pumping Accurate depiction of the interface and thickness dispersion can be useful in evaluating a protected yield pumping rate in waterfront aquifers Proper describing of the even and vertical water driven conductivity are fundamental in deciding safe yield pumping rate gauges The sheltered yield pumping rate evaluated with thought of saltiness effects is possibly lower then a rate assessed utilizing conventional techniques

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References Masterson, J.P., 2004, Simulated cooperation amongst freshwater and saltwater and impacts of ground-water pumping and ocean level change, Lower Cape Cod aquifer framework, Massachusetts: U.S. Geographical Survey Scientific Investigations Report 2004-5014, 72 p. Oldale RN (1992) Cape Cod and the Islands, the Geologic Story. Parnassus Imprints, East Orleans, Massachusetts, 208 p. Walter, D.A., and Whealan, A.T., 2004, Simulated water sources and impacts of pumping to wells and surface waters, Sagamore and Monomoy stream focal points, Cape Cod, Massachusetts: U.S. Land Survey Scientific Investigation Report 2004-5181, 85 p.

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Acknowledgments The creators wish to express gratitude toward Mark White of Environmental Partners Group and Andrew Miller of Head First for a long time of dialogs that have enhanced this paper. We\'d likewise get a kick out of the chance to say thanks to John Masterson of the U.S. Geologic Survey for discourses on the U.S.G.S. Cape Cod SEAWAT show. For extra data please visit our website page at http://www.mclaneenv.com/sub_links/news.htm

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