Journal ArticleDOI
Using groundwater levels to estimate recharge
Richard W. Healy,Peter G. Cook +1 more
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TLDR
A review of methods that are based on groundwater-level data is presented in this article, where the theory underlying the methods is explained and examples from the literature are used to illustrate applications of the different methods.Abstract:
Accurate estimation of groundwater recharge is extremely important for proper management of groundwater systems. Many different approaches exist for estimating recharge. This paper presents a review of methods that are based on groundwater-level data. The water-table fluctuation method may be the most widely used technique for estimating recharge; it requires knowledge of specific yield and changes in water levels over time. Advantages of this approach include its simplicity and an insensitivity to the mechanism by which water moves through the unsaturated zone. Uncertainty in estimates generated by this method relate to the limited accuracy with which specific yield can be determined and to the extent to which assumptions inherent in the method are valid. Other methods that use water levels (mostly based on the Darcy equation) are also described. The theory underlying the methods is explained. Examples from the literature are used to illustrate applications of the different methods.read more
Citations
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Journal ArticleDOI
Choosing appropriate techniques for quantifying groundwater recharge
TL;DR: The reliability of recharge estimates using different tech- niques is variable as mentioned in this paper, and uncertainties in each approach to estimating recharge underscore the need for application of multiple techniques to increase the expected recharge rates at a site.
MonographDOI
Estimating groundwater recharge
TL;DR: In this article, a critical evaluation of the theory and assumptions that underlie methods for estimating rates of groundwater recharge is provided, with detailed explanations of the methods provided - allowing readers to apply many of the techniques themselves without needing to consult additional references.
Journal ArticleDOI
Impact of land use and land cover change on groundwater recharge and quality in the southwestern US
TL;DR: In this paper, the authors examined the effects of land use/land cover changes on groundwater recharge and solute transport in the Amargosa Desert (AD) in Nevada and in the High Plains (HP) in Texas, US.
Journal ArticleDOI
Climate change impacts on groundwater and dependent ecosystems
Bjørn Kløve,Pertti Ala-aho,Guillaume Bertrand,Jason J. Gurdak,Hans Kupfersberger,Jens Kværner,Timo Muotka,Timo Muotka,Heikki Mykrä,Elena Preda,Pekka M. Rossi,Cintia Bertacchi Uvo,Elzie M. Velasco,Manuel Pulido-Velazquez +13 more
TL;DR: In this paper, a review examines climate change effects on groundwater and dependent ecosystems, focusing on the impacts of changes to groundwater on GDE biodiversity and future threats posed by climate change.
Journal ArticleDOI
Control of Tamarix in the Western United States: implications for water salvage, wildlife use, and riparian restoration.
Patrick B. Shafroth,James Cleverly,Tom L. Dudley,John P. Taylor,Charles van Riper,Edwin P. Weeks,James N. Stuart +6 more
TL;DR: The literature on saltcedar control, water use, wildlife use, and riparian restoration is reviewed to provide resource managers, researchers, and policy-makers with a balanced summary of the state of the science.
References
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Journal ArticleDOI
A closed-form equation for predicting the hydraulic conductivity of unsaturated soils
van Genuchten,M. Th. +1 more
TL;DR: Van Genuchten et al. as mentioned in this paper proposed a closed-form analytical expression for predicting the hydraulic conductivity of unsaturated soils based on the Mualem theory, which can be used to predict the unsaturated hydraulic flow and mass transport in unsaturated zone.
Journal ArticleDOI
Developing joint probability distributions of soil water retention characteristics
TL;DR: In this paper, a method is presented for developing probability density functions for parameters of soil moisture relationships of capillary head [h(θ)] and hydraulic conductivity [K(α), which are required for the assessment of water flow and solute transport in unsaturated media.
Journal ArticleDOI
Choosing appropriate techniques for quantifying groundwater recharge
TL;DR: The reliability of recharge estimates using different tech- niques is variable as mentioned in this paper, and uncertainties in each approach to estimating recharge underscore the need for application of multiple techniques to increase the expected recharge rates at a site.
Book
Quantitative Hydrogeology: Groundwater Hydrology for Engineers
TL;DR: In this article, a description of the water cycle inside the Earth's crust, the subsurface flow, and quantification of various types of sub-surface flow, obtained by applying the principles of fluid mechanics in porous media are presented.