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Comparison of recharge estimates at a small watershed in east-central Pennsylvania, USA

Content Provider	Springer Nature Link
Author	Risser, Dennis W. Gburek, William J. Folmar, Gordon J.
Copyright Year	2008
Abstract	The common recommendation that recharge should be estimated from multiple methods is sound, but the inherent differences of the methods make it difficult to assess the accuracy of differing results. In this study, four methods for estimating groundwater recharge and two methods for estimating base flow (as a proxy for recharge) are compared at two hydrologic research sites in east-central Pennsylvania, USA. Results from the multiple methods all provided reasonable estimates of groundwater recharge that differed considerably. The estimates of mean annual recharge for the period 1994-2001 ranged from 22.9 to 35.7 cm—about 45% of the mean of all estimates. For individual years, recharge estimates from the multiple methods ranged from 30 to 42% of the mean value during the dry years and 64 to 76% of the mean value during wet years. Comparison of multiple methods was found to be useful for determining the range of plausible recharge rates and highlighting the uncertainty of the estimates.La recommandation usuelle stipulant que la réalimentation doit être estimée à partir de plusieurs méthodes est sensée, mais les différences inhérentes à chaque méthode rendent difficile l’évaluation de la validité de résultats divergents. Dans la présente étude, quatre méthodes d’estimation de la réalimentation des eaux souterraines et deux méthodes d’estimation du débit de base (comme approximation de la recharge) sont comparées sur deux sites de recherche hydrologique au centre-est de la Pennsylvanie (Etats-Unis). Les résultats des diverses méthodes ont tous produit des estimations raisonnables de la réalimentation, qui différaient considérablement. Les estimations de la recharge annuelle moyenne sur la période allant de 1994 à 2001 variaient entre 22.9 et 35.7 cm (environ 45% de la moyenne de l’ensemble des estimations). Pour chaque année individuellement, les estimations de réalimentation des diverses méthodes variaient de 30 à 42% autour de la valeur moyenne lors des années sèches, et de 64 à 76% lors des années humides. La comparaison des méthodes s’est avérée utile pour déterminer la gamme des taux de réalimentation plausibles, et pour souligner l’incertitude des estimations.La recomendación habitual que la recarga debería estimarse a partir de métodos múltiples es apropiada, pero las diferencias inherentes de los métodos hacen difícil evaluar la exactitud de los diferentes resultados. En este estudio, se comparan cuatro métodos para estimar recarga del agua subterránea y dos métodos para estimar caudal de base (como sustituto de recarga) en dos sitios de investigación hidrológica en el centro-este de Pensilvania, EEUU. Los resultados a partir de los métodos múltiples proporcionan estimaciones razonables de la recarga de las aguas subterráneas que difieren considerablemente. Las estimaciones de la recarga media anual para el período 1994-2001 fluctuó entre 22.9 y 35.7 cm—alrededor del 45% de la media de todas las estimaciones. Para los años individuales, las estimaciones de la recarga a partir de métodos múltiples osciló entre el 30 y el 42% del valor medio durante los años secos y entre el 64 y el 76% del valor medio durante los años húmedos. La comparación de métodos múltiples se consideró útil para determinar la gama de ritmos de recarga plausibles y para resaltar la incertidumbre de las estimaciones.A recomendação comum que a recarga deve ser estimada a partir de vários métodos é boa, mas as diferenças intrínsecas dos métodos tornam difícil avaliar a exactidão de resultados divergentes. Neste estudo, quatro métodos de estimativa de recarga de aquíferos e dois métodos para estimar o escoamento de base (como um “proxy” para a recarga) são comparados em dois locais de estudo situados no centro-leste da Pensilvânia, E.U.A. Todos os resultados dos múltiplos métodos forneceram estimativas razoáveis para a recarga subterrânea que diferia consideravelmente. As estimativas de recarga anual média para o período 1994-2001 variaram entre 22.9 e 35.7 cm—cerca de 45% da média de todas as estimativas. Individualmente, para cada ano, as estimativas de recarga com base nos múltiplos métodos variaram entre 30 a 42% do valor médio durante os anos secos e de 64 a 76% do valor médio durante os anos húmidos. A comparação de múltiplos métodos para a estimativa da recarga subterrânea foi considerada útil para determinar o intervalo de taxas de recarga plausíveis e fazer sobressair a incerteza das estimativas.
Starting Page	287
Ending Page	298
Page Count	12
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	17
Issue Number	2
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2008-12-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater recharge Base flow Fractured rocks USA Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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