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Journal Article
Published: 19 August 2019
Quarterly Journal of Engineering Geology and Hydrogeology (2020) 53 (2): 236–251.
... to tunnelling, the drawdown at the well locations was determined. From the drawdowns and using Dupuit's equation, the depletion of well flow rates after tunnelling was estimated. To evaluate the results, observed well flow rates before and after tunnelling were compared with the predicted flow rates...
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Journal Article
Journal: Elements
Published: 01 August 2019
Elements (2019) 15 (4): 253–258.
... of this is that carbonate weathering, which results in no net change to atmospheric CO 2 levels over geological timescales ( Kasting 2019 this issue), can lead to drawdowns of CO 2 that are significant over the timescales of anthropogenic climate change. The above accounting of weathering pathways assumes that carbonic...
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Journal Article
Published: 19 June 2019
Quarterly Journal of Engineering Geology and Hydrogeology (2020) 53 (1): 125–136.
.... The results show that the scheme can keep the water table at the desired levels over a limited area. The maximum predicted nodal drawdowns after one year of pumping at 16 835 m 3 d –1 were 4.2 and 5.24 m in the two areas. Further investigations are proposed with the objective of optimizing pumping rates...
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Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP479.4
EISBN: 9781786204226
... Abstract Pumping tests carried out in three highly tectonized Mediterranean areas, which share similar climate conditions, were used to characterize hard-rock aquifers and examine the issue of the sustainable yield of wells. On the basis of the identified drawdown trends and hydraulic...
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Series: Geological Society, London, Special Publications
Published: 01 January 2019
DOI: 10.1144/SP479-2017-52
EISBN: 9781786204226
... implementation of dewatering ( Edwards et al. 1991 ). Since the last test, the base of the quarry and drawdown levels had been doubled, increasing the impact on groundwater levels in the aquifer. The study sought to investigate the impact of this increased dewatering on the aquifer–conduit interaction...
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Journal Article
Published: 24 August 2018
Environmental and Engineering Geoscience (2018) 24 (3): 281–291.
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Journal Article
Published: 15 January 2018
Quarterly Journal of Engineering Geology and Hydrogeology (2018) 51 (1): 124–137.
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Journal Article
Published: 01 February 2017
Petroleum Geoscience (2017) 23 (1): 134–147.
... the presentation of these case examples. The second example illustrates the use of salinity and pressure data in tracking aquifer flows affected by faults due to aquifer recharge during production-related drawdown and seawater injection for pressure support. This involves an Upper Cretaceous mixed dolomitic...
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Journal Article
Journal: AAPG Bulletin
Published: 01 January 2017
AAPG Bulletin (2017) 101 (1): 1–18.
... many years because of the wells’ relatively limited contact area with the reservoir and resulting sizeable drawdown. However, horizontal wells can be drilled from offshore platforms, for example, into a shallow, poorly consolidated, permeable sand horizon overlain and underlain by silt- or clay...
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Series: GSA Special Papers
Published: 01 May 2016
DOI: 10.1130/2016.2520(14)
Series: GSA Special Papers
Published: 01 May 2016
DOI: 10.1130/2016.2520(15)
..., development, and management. The system also can be expanded to include features that evaluate constraints to groundwater development, such as insufficient available drawdown, degraded groundwater quality, insufficient aquifer yields, and well-field interference. Ultimately, the aquifer information system...
Journal Article
Published: 01 March 2016
Environmental Geosciences (2016) 23 (1): 49–80.
... methane greater than 6 mg/L correlated ( p ≤ 0.05) to natural changes in regional groundwater levels. Dissolved methane concentrations in groundwater are highest when regional groundwater levels are at seasonal lows, and they vary in response to groundwater fluctuation. Water-level drawdown during water...
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Journal Article
Published: 01 August 2014
Environmental and Engineering Geoscience (2014) 20 (3): 273–285.
.... Recognition of domains with similar orientation and magnitude of transmissivity tensors is important for effective groundwater management. The Pen Argyl Member of the Martinsburg Formation is a thick sequence of claystone slate with subordinate intercalated quartzose slate and sub-graywacke. Time-drawdown...
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Journal Article
Published: 01 January 2014
Rocky Mountain Geology (2014) 49 (1): 1–16.
... identified. One analysis of helium isotopes (R/R A = 0.062) ( Welhan et al., 1988 ) suggests the thermal waters of the Thermopolis hydrothermal system do not have a mantle signature, an observation consistent with the regional model of Newell et al. (2005) . Drawdown of the Park City-Tensleep Aquifer...
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Journal Article
Published: 01 August 2013
Environmental and Engineering Geoscience (2013) 19 (3): 253–263.
... parameters for non-leaky and leaky confined aquifers. A simple alternative approach using new computer tools can be used to estimate the aquifer parameters for both non-leaky and leaky confined aquifers given transient drawdown data from a nearby observation well. The proposed alternative methodology uses...
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Journal Article
Published: 30 July 2013
Quarterly Journal of Engineering Geology and Hydrogeology (2013) 46 (3): 293–302.
... of the Lower Aquifer. Cavitation within the granular beds of the Lower Aquifer would have occurred as a consequence of drawdown from the extensive water extraction that began at the start of the nineteenth century, resulting in the water table dropping by almost 70 m. Estimated historical pore pressure...
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Journal Article
Published: 01 November 2012
Quarterly Journal of Engineering Geology and Hydrogeology (2012) 45 (4): 447–456.
... of declining groundwater levels, digging of new wells has been forbidden since 1993. The average drawdown rate in the Famenin and Kabudar-Ahang plains is 3.15 and 2.25 m a −1 , respectively ( Fig. 4 ). A contour map of the drawdown groundwater level in the study area from 1988 to 2008 is presented...
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Journal Article
Published: 01 August 2012
Environmental and Engineering Geoscience (2012) 18 (3): 295–308.
... trends, rather than the site-specific testing and analysis required for dewatering during building construction. Aquifer pumping tests were performed at two sites in the Hollywood Basin in Los Angeles, California, where there are ongoing subsurface construction and dewatering operations. Step drawdown...
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Journal Article
Published: 01 November 2011
Environmental and Engineering Geoscience (2011) 17 (4): 391–415.
... not a statistically significant factor influencing NIR signatures in these wetlands. The spatial distribution of wetlands with high NIR DNs was inconsistent with conical groundwater drawdown predicted by groundwater models but suggests more linear fluid movement via subsurface preferential NW-SE flow paths. 1...
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Journal Article
Journal: Elements
Published: 01 June 2011
Elements (2011) 7 (3): 147.