196,317 research outputs found
D-0334: 60 West 100 North, Logan, Utah, William Currell/Jessie C. Currell/Walter L. and Harold M. F. Currell, GEM movie theatre. Lot 5 Block 14 Plat A
No full textD-0334: 60 West 100 North, Logan, Utah, William Currell/Jessie C. Currell/Walter L. and Harold M. F. Currell, GEM movie theatre. Lot 5 Block 14 Plat
D-1638: 71 East 400 South, Logan, Utah, Flora A. Jacobsen/Rulon W. Everton/Harold M. and Bernice E. Currell residence. Lot 1-8 Block 2 Plat D
No full textD-1638: 71 East 400 South, Logan, Utah, Flora A. Jacobsen/Rulon W. Everton/Harold M. and Bernice E. Currell residence. Lot 1-8 Block 2 Plat
Effect of aromatic isothiocyanates on the functional properties of human hemoglobin: role of the stereochemistry of the charged group
No full textEFFECT OF AROMATIC ISOTHIOCYANATES ON THE FUNCTIONAL-PROPERTIES OF HUMAN HEMOGLOBIN - ROLE OF THE STEREOCHEMISTRY OF THE CHARGED GROUP
No full textNO ABSTRAC
Intensive agriculture, a pesticide pathway to >100 m deep groundwater below dryland agriculture, Cordoba Pampas, Argentina
No full textGroundwater pesticide pollution in shallow groundwater is a well-established global phenomenon. However, deep aquifers are widely thought to be naturally protected from such modern contaminants, by confining geological barriers and upwards hydraulic gradients. Here we document pervasive pesticide pollution in >100 m deep artesian wells in a sedimentary aquifer below dryland agriculture. The vertical distribution of key groundwater markers, including numbers and concentrations of pesticides, stable (δ18O & δ2H) and radioactive (3H & 14C) isotopes and ion concentrations were used to develop a conceptual model of pollutant transport to deep groundwater. Tritium, stable isotope and pesticide distributions in unconfined groundwater indicate that water table rise to <1 m below the surface (due to anthropogenic landscape modification and periodic flooding), has created a rapid pollutant ‘doorway’ to groundwater. Despite a lack of deep borehole pumping for irrigation, these rising water tables have permanently inverted previously upward hydraulic gradients towards the underlying semi-confined aquifer in some areas. Physical heterogeneities and/or leaky domestic boreholes then act as preferential transport avenues for surface pollutants to both unconfined and semi-confined groundwater. These pathways allow small aliquots of highly contaminated surface water and modern unconfined groundwater to mix with the pre-existing pre-modern deep groundwater, resulting in mixed isotopic signatures in deep wells (e.g., radiocarbon <5 pMC but detectable tritium) and detections of multiple synthetic pesticides in the deep aquifer, including AMPA at concentrations up to 4.93 µg/L and Metolachlor up to 0.015 µg/L. Our results demonstrate how semi-confined deep groundwaters may be contaminated by current agricultural techniques even where deep groundwater exploitation is limited. We urge measures to eliminate these pollutant pathways.Full Tex
Strategic Regional Environmental and Baseline Assessment - Expert Review - Groundwater
No full textThe Beetaloo Strategic Regional Environmental and Baseline Assessment (SREBA) is a series of studies and datasets commissioned by the NT Government, in response to the findings and recommendations of the Scientific Inquiry into Hydraulic Fracturing in the Northern Territory (Pepper Inquiry). This document contains a review of the SREBA studies relating to groundwater, commissioned by the Environment Centre, NT. The scope of the review encompasses analysis of the extent to which the SREBA studies and datasets released in 2023 have addressed knowledge gaps regarding groundwater, that were identified as needing to be addressed, via recommendations of the Inquiry (outlined in Chapter 7 of the final report, and the SREBA Framework), prior to the commencement of an onshore gas industry in the region. [...]Full Tex
Lessons learnt from the localisation of WASH programs for those most overlooked in Cambodia
No full textCambodia aims to achieve 100 per cent rural sanitation coverage by 2025; however, a concern remains for communities overlooked in “challenging environments”. The Sanitation in Challenging Environments (SCE) Program has advocated for these communities since 2008 through targeted and collaborative projects. Strategic changes made in response to key events resulted in a collective action approach and release of national targets. Additionally, evolution in program management from foreign volunteers to Khmer staff ensured continuity and growth of the program through COVID-19. Using Outcome Harvesting methodology, we conducted a retrospective evaluation of the history of the SCE Program to generate lessons learnt. Analysis revealed insights and systemic challenges for two interrelated themes: communities most overlooked in conventional programming, and localisation of international programs. The SCE Program demonstrates the positive impact and necessity of both localisation and targeted programs for those most overlooked, and we present recommendations for global practitioners working in similar contexts.No Full Tex
Unpacking intersecting complexities for WASH in challenging contexts: A review
No full textEnsuring access to water, sanitation, and hygiene (WASH) for all requires a thorough understanding of the many contextual complexities that influence access to these services. Complexities spanning environmental, economic, political, and social dimensions, amongst others, can intersect and compound to hinder sustainable access to WASH for certain demographics or entire communities. This is of particular importance for challenging contexts where conventional WASH approaches are ineffective. Targeted approaches are required for these contexts to ensure that communities are not left behind in pursuit of the Sustainable Development Goals. Review of WASH literature identified seven broad types of challenging contexts: challenging environments, transient or environmentally-dependant communities, climate vulnerable communities, remote communities, poor urban communities, refugee camps, and emergency contexts. This review explores the intersecting complexities affecting access to WASH in these challenging contexts and how failure to understand the interconnectedness of these complexities has resulted in WASH solutions that are unaffordable, not inclusive, or unsustainable. To our knowledge, this review is the first of its kind. We emphasise the need to unpack intersecting complexities affecting WASH in challenging contexts, and we believe that incorporating such an approach early in WASH programs can ensure that intersecting complexities are accounted for in the design of WASH solutions. Ultimately, this novel lens may provide critical guidance for WASH programs in challenging contexts, ensuring that WASH solutions are contextually appropriate.No Full Tex
Dr. Duane M. Jackson, Morehouse College, July 2011
No full textThis video is a conversation with Dr. Duane M. Jackson. Dr. Jackson talks about his paper, "Recall and the Serial Position Effect: The Role of Primacy and Recency on Accounting Students' Performance." Jackie Daniel, AUC Woodruff Library, is the interviewer
The Cambrian Limestone Aquifer, Northern Territory: Review of the Hydrogeology and Management Rules to Ensure Protection of Groundwater Dependent Values
No full textThis report presents a concise review of the hydrogeology of the Cambrian Limestone Aquifer (CLA) in the Northern Territory (NT), and the ecological and cultural values sustained by its groundwater. It examines risks to these values associated with different approaches to the assessment of groundwater license applications in the CLA, including using the Top End and Arid Zone contingent rules, which apply in areas without a Water Allocation Plan (WAP), and other approaches proposed in draft WAPs (e.g., Georgina-Wiso). The report concludes with recommendations about appropriate methods and safeguards to protect the CLA’s groundwater and the values it sustains, in line with recommendations of the Pepper Inquiry. The major focus is the areas of the CLA where WAPs are in progress – Flora Tindall, Mataranka and Georgina Wiso. The Cambrian Limestone Aquifer (CLA) ranges from 100 mm/yr), associated with karst features (e.g., sinkholes). Discharge of groundwater to the surface appears to be limited to small but environmentally and culturally significant areas, where it sustains vitally important groundwater dependent ecosystems (GDEs). Groundwater from the Tindall Limestone flows to the surface via springs, wetlands, and the channels of the Roper and Flora rivers and associated tributaries. These groundwater flows support significant vegetation communities and aquatic ecosystems within spring pools, groundwaterdependent sections of streams, and downstream waterbodies. Fauna drink from groundwater-fed pools and terrestrial vegetation utilises groundwater where the CLA water table is shallow. GDEs are also found within the aquifer matrix, i.e., stygofauna, including crustaceans, within caves and cavities in the rock. These groundwater dependent sites, waters, fauna, and vegetation and are of great cultural significance to Aboriginal peoples of the region. Aboriginal peoples’ oral accounts highlight the interconnectedness of the region’s groundwater, surface water and landscape, and both human and non-human living communities, as well as ancestral beings. WAPs are not currently in place for the region encompassing the CLA and Beetaloo sub-basin, but are expected to be finalized in 2022-23, in accordance with recommendations from the Pepper Inquiry. A draft WAP for the Georgina-Wiso region is currently open for public review. Current rules for groundwater licensing where WAPs are not finalized use the Top End and Arid Zone contingent rules, to set caps on groundwater extraction rates for consumptive use in a given area. The Top End rules allow for allocation of groundwater licenses up to a fraction (20%) of estimated recharge. This approach is broadly in line with other groundwater management jurisdictions in Australia and worldwide, which calculate a Sustainable Yield as a fraction of recharge and/or discharge with the intention of balancing extraction with a need to maintain long-term groundwater access and limit impacts on GDEs. It should be noted however, that this method and/or the value of 20% may not always achieve these aims, due to complicated re-distribution of water balances in response to groundwater extraction. It remains unclear whether extracting 20% of recharge in aquifers currently classified as Top End (such as the Tindall Limestone) would have unacceptable consequences for GDEs. Preliminary analysis indicates significantly reduced flows to the Roper River could result, which would be particularly noticeable during dry periods. The Arid Zone rules, which apply to the south of a line delineating northward and southward flowing surface water catchments of the NT, contain two clauses relevant to groundwater. The first states that licensed extractions should have no detrimental impacts on GDEs; the second allows for depletion of 80% of total pre-development groundwater storage, over a 100-year timeframe. These two aspects of the rules are contradictory. It is not possible for the first aim to be achieved if the second part is permitted. In accordance with the conclusions of the Pepper Inquiry, using storage volumes to calculate sustainable yields is not in line with ecologically sustainable development and risks harm to groundwater dependent values. Aquifers should not be described in terms of total storage when considering sustainable yields or ‘safe’ extraction rates. It is the water flows to and from the aquifer sustaining other aspects of the water cycle and dependent values (e.g., flows to springs, rivers and vegetation) that are most important in assessing sustainable yield. These flows are normally very small in comparison to the total water in an aquifer’s storage; hence, extracting even small proportions of overall storage can have significant water cycle consequences (e.g., reduced baseflows and/or loss of groundwater dependent ecosystems). The Arid Zone contingent allocation rules appear to be one of the only cases in Australia where a storage-based approach is applied to the determination of a ‘sustainable’ yield. If this approach were to be adopted in WAPs covering the CLA and Beetaloo sub-basin and/or remains in use more generally, it would allow for unsustainable development of groundwater, with serious potential consequences for groundwater dependent ecosystems, cultural values and water users. In the Daly Basin/Tindall Limestone section of the CLA, where the Mataranka springs and Roper River occur, extraction at rates that cause long-term storage depletion would endanger these and other important GDEs, by reducing spring discharge, river baseflow and water table levels. The current draft WAP for the Georgina Wiso region proposes an estimated sustainable yield (yearly extraction cap) of 262.6 GL/year, estimated to be 40% of long-term averaged recharge. It is unclear how or why the value of 40% of recharge was determined to represent a sustainable level of extraction. In the Georgina and Wiso Basins, knowledge of the water balance, hydrogeology and groundwater dependent ecosystems are currently not sufficient to fully understand the effects of such extraction. The recharge estimate used to derive the ESY is model-derived and has considerable uncertainty. It is nearly double the value derived from earlier runs of the same model, and higher than some field-based estimates, meaning the ESY may constitute a larger fraction of recharge than assumed. The current data also indicate that recharge is considerably lower than the long-term average in most years (and may be negligible under the typical climate), except for rare events where rainfall (and recharge) far exceeds the rolling long-term average. Such periods have likely occurred only three or four times over the past century. The vast majority of estimated recharge to the Georgina and Wiso basins is associated with a single event in 1974. The recurrence interval for such recharge events, and details of their mechanism remain unknown. Therefore, under the proposed ESY, in most years, significant aquifer overdraft (extraction far exceeding recharge) would be permitted. Such overdraft may occur for many consecutive years (or decades), before the next episodic recharge event occurs. Drawdown associated with consecutive years (or decades) of aquifer overdraft in the Georgina and Wiso basins would endanger stygofauna communities and reduce cross-basin discharge fluxes within the CLA, e.g., to the Tindall Limestone aquifer (upon which key GDEs noted above depend). Currently, groundwater discharge mechanism(s) from these two basins is poorly understood. There may be additional groundwater dependent ecosystems within or close to the edge of the plan area sustained by CLA groundwater (such as springs in the western Wiso Basin, or un-mapped deeprooted vegetation communities). These GDEs may suffer reduced access to groundwater for extended periods between recharge events due to extraction at the proposed ESY, threatening their survival. Water quality risks, such as migration of saline water into fresher parts of the aquifer, and potential aquifer integrity issues associated with concentrated extraction in particular regions have also received limited or no attention in the draft WAP. Better characterization of GDEs, recharge and discharge mechanisms and rates, and more comprehensive assessment of these risks are urgently required before appropriate management rules can be adopted to ensure the Georgina-Wiso WAP does not lock in negative impacts on environmental and cultural values. Sustainable management of groundwater extraction throughout the CLA should adopt a management approach in line with contemporary best practice, that sets: 1) Volumetric extraction rate limits which in the long-term ensure: A) groundwater flows and levels do not decline in such a way as to compromise the health of the groundwater dependent ecosystems, water quality and aquifer integrity. This requires careful analysis of recharge and discharge flux rates, environmental dependencies on these flows, and the extent of ‘capture’ and drawdown caused by pumping at different rates. B) the renewability of groundwater resources, ensuring prevention of long-term storage depletion and/or detrimental capture of surface flows - recognising the value of the Roper River, Mataranka springs and other GDEs supported by the CLA. 2) Clearly defined and well monitored groundwater level thresholds, determined to be the elevations required to sustain environmental and cultural values of groundwater dependent sites and ecosystems – including through the maintenance of throughflows between the CLA basins. When these levels are approached or crossed, reductions in groundwater pumping should be triggered, in line with level-based management approaches adopted in other parts of Australia and internationally. Trigger levels must be set appropriate distances from environmental assets seeking to be protected to account for time-lags. Setting both a cap on total extractions in declared management zones, along with a series of water level thresholds and buffer zones to protect GDEs, would be in line with international best practices, if implemented alongside a robust monitoring program. Further, any rules developed to allow trading of groundwater should restrict the trade of extraction permits into areas close to high value GDEs. Together, these measures would ensure protection of key values supported by the CLA’s groundwater. This management approach should be informed by a continuing program of inter-disciplinary science and community consultation, focusing on groundwater requirements of GDEs, and modelling to determine relationships between flows to these, extraction volumes, gradients, and time. Knowledge gaps which should be addressed urgently include better qualitative and quantitative information on inter-basin and inter-aquifer flows (topics currently being investigated), better quantification of flows from the CLA and other aquifers to springs and streams (including those that have been less studied than Mataranka Thermal Pools and the Roper River), and eco-hydrological studies (including more extensive stygofauna surveys). These studies should determine the groundwater levels, flow rates and quality required to sustain key environmental and cultural values, as well as possible downstream consequences of reduced spring flows, river baseflows and groundwater throughflows of various magnitudes. Understanding what community stakeholders consider to be acceptable risks and impacts, and making public all relevant supporting scientific data and analysis informing WAP rules, should form part of the process of determining extraction rate caps and triggers. There is also a need to consider climate change and variability, with mechanisms to account for this built into long-term integrated water resources management.Full Tex
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