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  • Articles  (10,856)
  • 2005-2009
  • 1975-1979  (10,856)
  • 1978  (10,856)
  • Energy, Environment Protection, Nuclear Power Engineering  (7,937)
  • Electrical Engineering, Measurement and Control Technology  (2,919)
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  • Articles  (10,856)
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  • 2005-2009
  • 1975-1979  (10,856)
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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Hydraulic conductivity studies of a consolidated pozzolanic material indicate that heat-shrinkable tubing can be utilized to encase cylinders for use in a permeameter. The materials required for encasement of a sample include: heat-shrinkable tubing, hose clamps, polyvinyl chloride discs, glass tubing, and an electric oven. The procedure requires that the assembled PVC discs, filters, shrinkable tubing, and sample be placed on a support stand in an electric oven for three to four minutes at a temperature between 450–500° F. Upon removal from the oven, hose clamps are placed around each PVC disc. The method has several advantages. It saves time and expenses over conventional methods such as pneumatic pressurized core holders or triaxial testing units and preserves the original interstitial bore spaces of the sample.
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Sulfate sorption data determined from laboratory investigations were used to predict movement of sulfate during a field experiment of artificial ground-water recharge in a basin near Lubbock, Texas. Laboratory studies confirmed that sulfate sorption is controlled in the system by surface area, content of iron oxides and hydroxides, and pH. Predicted sulfate distribution in the unsaturated zone was made by assuming constant one-dimensional flow. Where these assumptions were met, predictions were generally good at shallow depths and for short times.At greater depths and longer times, these assumptions combined with other factors, such as changes in effective porosity, variable mineralogy, changing hydrodynamic dispersion coefficients, and variable infiltration rates contributed to the failure of the predicted values to match the observed data.It appears that sulfate distribution in the unsaturated zone during artificial recharge can be predicted by using easily derived laboratory data if the flow conditions in the field can be described adequately.
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  • 3
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A field instrument to determine saturated permeability is presented. It is possible to take several samples and obtain measurements quickly. The instrument, adapted for a series of measurements, permits the identification of erroneous values and allows repeated measurements. Calculating permeability values through self-made tables or nomograms make field results immediately available for the description of the cross section. Transporting the samples to the laboratory is no longer required. The instrument is sturdy, and requires little maintenance.
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Electrical power plant and solar heating systems have been proposed wherein confined ground-water aquifers are used as temporary storage reservoirs for thermal energy in the form of moderate to high temperature water (140°F-400°F; 60°C-204°C). The Water Resources Research Institute of Auburn University has performed an aquifer storage experiment involving warm water (97°F; 36°C). The objectives of the experimental program were to begin actual testing of the concept of heat storage in aquifers and to provide data for calibration of mathematical models describing the simultaneous transport of water and heat. Phase I consisted of drilling an exploratory well at the selected field site near Mobile, Alabama. Phase II involved construction of the central injection well, three observation wells, and performance of preliminary pumping tests. Phase III was devoted to construction of the remainder of the observation well field, performance of final pumping tests, and measurement of aquifer thermal properties; while Phase IV was devoted to a cycle of warm-water injection, storage, and recovery. It was concluded that heat storage aquifers must have low natural pore velocities, and care must be taken not to clog the injection well with solids or precipitated chemicals. Swelling of clays in the storage formation must be minimized, and hydraulic pressures capable of breaching the confining layers must be avoided. Mechanical and chemical clogging problems may be minimized by using formation water as influent to the heating system. For a 36-day storage of 2 million gallons, the calculated energy recovery factor of 0.69 was considered promising. Future research should be directed toward experimental studies involving larger volumes of water and high-injection temperatures. Study should be directed also to the geochemistry problem and the effect of high temperatures on the mechanical and hydraulic properties of clay confining layers.
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The distribution of nitrate, chloride and dissolved solids from ground water from the Ogallala aquifer in a 27-county area of west Texas illustrates widespread areas of poor water quality. Elements studied increased in concentration from northwest to southeast across the Southern High Plains. Northeast of a line from about Clovis, New Mexico to Lubbock, Texas, nitrate tends to be 〈45 mg/l, chloride is 〈20 mg/l, and dissolved solids are 〈400 mg/l. However, southwest of this line nitrate may exceed 60 mg/l and in some areas exceeds 170 mg/l. Chloride commonly exceeds 500 mg/l and may be 〉2000 mg/l, and dissolved solids usually exceed 1000 mg/l and may be 〉8000 mg/l. Regional distribution may be the result of long-term migration of Ogallala ground water but the present water quality and distribution, as well as time, distance, stratigraphy and permeability, suggest contamination of Ogallala ground water by vertical rather than lateral migration. Most of the high nitrate values (〉45 mg/l) occur in areas having sandy soils which have been intensively cultivated, thus leaching of nitrogen-based fertilizers is suspect. However, the high chloride and dissolved solids, which exist in essentially the same geographic area, probably represent vertical to local lateral seepage of saline water from large alkali lake basins and local vertical migration from saline Cretaceous aquifers.
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The Evangelical Lutheran Church (E.L.C.) Water Development Project, headquartered in Betul, Madhya Pradesh, India, has been involved since 1971 in developing ground-water supplies in the Satpura Hill Region of Central India. To date, over 400 wells have been drilled in crystalline rocks and more than 100 of these wells have been pump-tested to determine aquifer hydrologic characteristics.Crystalline rocks crop out in roughly 20 percent of the Satpura Hill Region and the main rock types are granite, gneiss, and schist. The crystalline-rock country is gently undulating and ground-water flow systems are of the local type being limited to small drainage basins of a few square miles in area.The controlled testing and detailed analysis of over 100 pumping tests provided an excellent opportunity to evaluate the applicability of standard analytical models for the analysis of pumping tests in crystalline-rock aquifers.Step-test data were analyzed by Rorabaugh's (1953) method and by a graphical method. The results indicate that well losses are significant in a number of wells tested and appear to be related to non-Darcian flow in the aquifer adjacent to a pumped well.Constant-rate pumping tests were used to determine aquifer transmissivity. Time-drawdown data were analyzed by the Cooper-Jacob (1946) approximation to the Theis (1935) equation and recovery data were analyzed by the residual drawdown method. Aquifer transmissivity ranged over two orders of magnitude from 102 to 104 gpd/ft (1.24 to 1.24 × 102 m2/day). Pumping-test results often enabled the prediction of aquifer conditions, such as limited aquifers, recharge and leakage boundaries, and aquifer dewatering.
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  • 9
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 10
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Surface-water and ground-water quality were evaluated at a site before and for four years after the area was used for entrenchment of sewage sludge. The soils in the area are sandy and are underlain by a clay barrier. Depth of the water table which in most instances is above the clay barrier is from 1.0 to 13.0 m. Water samples taken from monitoring wells, two drainage tiles located along the perimeter of the sludge trenches, a catchment pond and a nearby stream were analyzed for NO3-N, NH4-N, and CI. Increases in Cl concentrations were detected in shallow wells within the trench site perimeter 12 months after sludge entrenchment. Chloride levels peaked approximately 18 months after entrenchment and levels declined but not to background levels four years after entrenchment. Nitrate levels increased in shallow wells located within or near the trench site perimeter at 18 months after entrenchment and peaked at 30 months. Decreases in NO3-N occurred thereafter but had not reached background levels in some wells. Ammonium increases were also detected in wells recording Cl and NO3-N increases but NH4-N increases were inconsistent. Increases in Cl and NO3-N levels were recorded in wells potentially below the trench area, but these levels were less than those recorded for wells within the trench site perimeter. The data from this study indicate that contamination of ground water by leachate from sludge trenches was within the trench site perimeter with a lesser degree of contamination recorded in wells below the trench site. The drainage tiles and clay barrier may have had a significant effect on the resulting ground-water data, and caution is advised in extrapolating these results to other locations.
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  • 11
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 12
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Both rhodamine WT and tritium were found to be satisfactory tracers to determine the direction and velocity of flow of the secondary treated effluent from the Lake George Village Sewage Treatment Plant which is applied to natural delta sand beds by the rapid infiltration technique. The average vertical velocity in the unsaturated portion of the sand bed was approximately 0.85 m/day (2.8 ft/day). The horizontal flow in the saturated aquifer reached between 10 and 12 m/day (33–40 ft/day). The velocity appeared to decrease with distance from the sand infiltration beds, although this may have been the result of a change in direction of the major portion of the ground-water flow with the observation well not being in direct line of the direction of flow. Unfortunately, the dye could be traced only slightly less than half the distance from the sand infiltration beds to the seepage area adjacent to West Brook. Thus, a positive determination that the seepage consists primarily of sewage effluent and the ultimate time of flow to the seepage could not be determined in this study.
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  • 13
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 14
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 15
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The impacts of a coal-fired power plant on the ground-water system of a river floodplain wetland in central Wisconsin were quantified. The most important impacts were those related to the construction of a 200-ha cooling lake and a 28-ha ash pit.Several two-dimensional vertically-oriented steady-state models of the ground-water flow system were used to simulate ground-water flows before and after the filling of the cooling lake. The results of the simulation and supporting field evidence indicate that the creation of the cooling lake greatly altered the configuration of the flow system and increased the discharge of ground water to the wetland west of the lake by a factor of six. Moreover, ground-water temperatures have increased because of heat input from the cooling lake. Although the wetland biota are responding to the altered physical environment, the high rate of leakage from the cooling lake is not undesirable from a lake management standpoint. Seepage to the ground-water system prevents a buildup of dissolved solids which would necessitate periodic flushing of the lake and release of saline water to the Wisconsin River.Since 1975, concentrations of Ca+2 and SO4-2 have increased in ground water around the ash pit, suggesting that seepage is occurring. However, the plume of contaminated ground water is presently confined to a relatively small area around the ash pit.
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  • 16
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A plume of ground water enriched by liquid metal-plating effluent has formed downgradient from an industrial park in southeast Nassau County, New York. Discharges from the plant to the shallow aquifer began in the 1940's and continue to the present.Core samples of aquifer material from the plume were analyzed by oxalate extraction and dithionite-citrate-bicarbonate (DCB) extraction methods for the presence of chromium and cadmium. Results of the extraction indicate that for 1 kilogram of soil, the median concentrations of extracted chromium and cadmium in aquifer material are 7.5 and 1.1 milligrams, respectively, and the maximum concentrations are 19 and 2.3 milligrams, respectively.
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  • 17
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 18
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Abstract. W. Badon Ghyben and A. Herzberg are commonly credited with the first scientific description of fresh ground water floating on deeper saline water along coastal areas of the world. As C. W. Carlston has pointed out, J. DuCommun should receive the credit for the first quantitative statement of the “Ghyben-Herzberg principle,” DuCommun's work having antedated publications by both Badon Ghyben and Herzberg by more than 60 years. Moreover, two well-known scholars, Pliny the Elder and Charles Darwin also wrote on the topic long before Badon Ghyben and Herzberg.
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  • 19
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Flow to wells in water-table aquifers is related to anisotropy, vertical components of flow, well storage capacity, degree of well penetration, and changes in aquifer saturated thickness. The manner and extent to which these factors affect water levels may be evaluated with aquifer test data. Families of type curves describe the typical S-shaped curves of log drawdown versus log time observed around wells in water-table aquifers. Comprehensive analysis of water-table aquifer test data is possible with the array of equations derived largely in the late 195O's to 1970's. Erroneous data analysis will result unless complicating factors are fully recognized and taken into account. This paper reviews existing methods which the author accepts and recommends for ground-water investigator use.
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  • 20
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Many aspects of ground water involve shortest paths between two points and shortest round trips to many points. These problems are included in network theory which is not easily available to ground-water specialists. This paper introduces some of the techniques which can be solved by hand for fairly small projects. Larger networks can often be divided into districts, each of which may then be amenable to hand solution.The minimal spanning tree problem is described as background to the more useful problem of shortest path between two particular nodes. The matrix method is the simplest solution for the shortest path between all pairs of nodes and can easily be solved by hand for 30 or less nodes. This data can be used to determine which node is most centrally located and to determine a shorter round trip from one node to all others, returning to the origin. The matrix can be used for partial routes and for routing of two or more vehicles.
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  • 21
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 22
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 23
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: This paper presents ten theses summarizing: The cyclic pattern of precipitation and runoff in the Central Valley of California and the need for cyclic storage to insure regularity and continuity in water supply; the inadequacy of surface-water storage because of evaporation losses and probable interference with ground-water recharge; the blasted hopes of Federal and State water agencies for control and management of the ground-water reservoir, because of potential conflict with private property rights; the artificial recharge by private and local enterprise; increasing emphasis in Federal and State programs upon surface reservoirs at increasing cost in money and water; the tendency of Federal policy to focus on the needs and clamors for irrigation water, with subsidies; and the availability of water from Federal projects now under construction for artificial recharge and subsurface storage, a first step to a long-range program of cyclic storage.
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  • 24
    Electronic Resource
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    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 25
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    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Nitrogen-isotope values (δN15) of ground-water nitrate on Long Island, New York, correlate with δN15 ranges of nitrate sources which contribute to the ground-water systems. The δN15 of nitrate in water from the upper glacial aquifer, the water-table aquifer on Long Island, shows a shift from lighter values in the eastern part of the island where land is used predominantly for agriculture, to heavier values toward New York City where land is used for suburban residences with septic systems or sewers. δN15 values for inorganic fertilizer, unfertilized cultivated fields, and animal wastes show a similar shift from low to high values: −3 ‰ to +2 ‰+ 2 ‰ to + 8 ‰ and +10 ‰ to +20 ‰, respectively.Nitrogen-isotope ratios of nitrate in water from the deeper Magothy aquifer indicate a mixed source of nitrate.
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  • 26
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    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The city of San Bernardino is in a semiarid inland valley about 60 miles (100 kilometers) east of Los Angeles. The southern part of the city is traversed by the San Jacinto fault. Adjacent to the upgradient (northeast) side of the fault is a 10 square mile (26 square kilometers) area which contains a zone in the alluvial ground-water basin that formerly was under artesian pressure and consisted of swampy lands with a history of flowing wells, springs, and ground-water discharge to Warm Creek.Since about 1945, water levels have declined more than 100 feet (30 meters), and the swampy lands have dried up and are now highly urbanized. Basin replenishment by artificial recharge of imported northern California water at the base of the San Bernardino Mountains may cause ground-water levels to rise again in the area that was formerly swampy land. If this should happen, building foundations and basements could be subjected to structural damage and flooding by renewed flowing of unplugged artesian wells.The U.S. Geological Survey, in cooperation with the San Bernardino Valley Municipal Water District, is developing a two-layer digital model to aid in predicting the rate and extent of the rise in water levels. The solution to the mathematical equations used in the model was approximated numerically by the Galerkin finite-element method. The water district desires to evaluate water management alternatives, such as varying location, distribution, amounts of recharge, and pumping centers, to avoid excessive water level rises that could indicate an overfilling of the basin and could cause damage.
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  • 27
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    Oxford, UK : Blackwell Publishing Ltd
    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 28
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A simple inexpensive device for sample collection and for monitoring of ground-water potential at many levels from a single borehole installation has been developed. The device consists of a bundle of polypropylene tubes contained inside a polyvinyl chloride (PVC) pipe that is installed in the aquifer. Each tube protrudes through the wall of the pipe at a different elevation where it serves as a point water sampler and piezometer. The tip of each tube is encased in fine-meshed stainless-steel screening. The device is best suited for use in cohesionless deposits and where the piezometric levels are close enough to ground surface to enable samples to be obtained by suction methods. It can be conveniently installed using a hollow-stem auger, driven casing or wash-boring methods. The usefulness of this multilevel sampling device has been demonstrated in detailed monitoring of a leachate plume from a sanitary landfill.
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  • 29
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 30
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Hydrochemical facies interpretations are useful tools for determining the flow patterns, origins, and chemical histories of ground-water masses. Factor analysis is advantageous for hydrochemical interpretations because it is independent of the number or type of variables used. Factor analysis also allows avoidance of problems of closed-number systems inherent in more traditional techniques, such as trilinear diagrams. This paper applies factor analysis to the interpretation of mixing between sulfate and bicarbonate ground-water masses. Whereas trilinear diagrams show one mixing trend (bicarbonate with sulfate waters), factor analysis allows interpretation of multiple mixing trends. These trends include the bicarbonate-sulfate trend; a sodium-, silica-, fluoride-, and temperature-mixing system that is interpreted as resulting from recharge; and a chloride-sodium system that appears to represent mixing with residual, connate water. The latter trends are identified as small-scale, chemical variations that result in dispersion of the data points about the dominant mixing trend on the trilinear diagram. Thus, factor analysis provides greater precision in identifying hydrochemical facies and interpreting their origins.
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  • 31
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: The concepts of target size and the effective size of the detection device are basic to any search problem. The type of target in hydrogeologic studies may either be a distinct or discontinuous one or may be the optimum value in a continuum. Search patterns can be one-dimensional along a line or two-dimensional. For discontinuous targets, such as an abandoned well, some kind of grid pattern is necessary, although more effective search patterns exist if some property of the target, such as the geoelectric field, can be detected over a larger area. Search for an optimum value of a continuum, i.e. a bedrock surface, a water-table surface, etc., can be economically shortened by using adaptive search techniques. Examples of adaptive search techniques along a line are the Golden Section, Fibonacci Search, Dichotomous Search and Interval Bisection methods. The first three are based on values (depth, etc.) and the last on direction of gradient. Two-dimensional adaptive search methods include repeating lines or search using the line search methods. A completely different approach is the Sequential Simplex Search, a heuristic method which seems to be the most efficient available.
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  • 32
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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  • 33
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    Ground water 16 (1978), S. 0 
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  • 34
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    Ground water 16 (1978), S. 0 
    ISSN: 1745-6584
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
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    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: A model system was developed for the purpose of studying the biological compatibility of aqueous industrial waste and subterranean disposal zones for injected waste. The model design incorporated devices for; anaerobic, aseptic compositing of effluent samples; collection of gases generated in the model elements; isolation of model elements against downstream contamination; and imposition of a normally-distributed waste concentration profile in the feed stream. The finished model was, with the exception of operating pressure, physically and chemically similar to an existing waste disposal aquifer, and waste degradation and population growth data obtained on the model correlated with observations of the same parameters made in the real aquifer.
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    Notes: The areal distribution of 293 samples from the ground water of Merrick County, Nebraska has definite patterns of high (〉20 ppm), intermediate (10–20 ppm), and low (〈10 ppm) nitrate-nitrogen concentrations. Where contamination is present the nitrate-nitrogen concentrations are relatively homogeneous indicating large diffuse nonpoint sources. SYMAP (gray-scale mapping) indicates exceptionally good correlation between the irrigated coarse-textured soils and the higher nitrate-nitrogen levels. The obvious implication is that the nitrate-nitrogen levels are directly dependent on the leaching of nitrogenous material dispersed in or on the coarser-textured soils. The widespread use of commercial nitrogen fertilizer on irrigated corn acreages is suspected of being the major contributor of nitrate to the ground water.
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    Notes: A differential equation for axisymmetric radial transient flow to a nonpenetrating well in an infinite leaky aquifer in spherical coordinate system has been formulated. A general solution for nonsteady-state flow was obtained for nonpenetrating wells in leaky artesian aquifers with a general time variable discharge function, as well as for the specific case of exponential decay discharge function. The solution is expressed in terms of standard mathematical functions.
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    Notes: Drill-stem tests may be useful for such hydrogeological purposes as regional ground-water or geothermal resource studies. Water samples, hydraulic head and hydraulic conductivity may be obtained from these tests.Analysis of 41 drill-stem tests conducted for a regional ground-water study reveals that maximum pressures recorded during a test should exceed 30 percent of the full scale of the pressure gauge used in the case of bourdon-type instruments. Use of drill-stem-test data without consideration for percent deflection of the pressure recorder, even with evaluation of mechanical quality will mean that individual values of pressure head may be as much as 30 percent different from that which would be obtained in an observation well. The error is random and has a median value approximating that which would be observed in a well completed over the same interval. Use of large numbers of drill-stem tests will produce hydraulic head maps which agree with those produced by conventional observation wells.
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    Notes: Seismic refraction methods can often indicate the saturated thickness of an aquifer. However, if an impermeable blind zone layer is present, it will not show up in the refraction profile. As a result, saturated thickness and transmissivity values indicated by the profile will be too high. It is thus important in many cases to look for a blind zone layer, and resistivity data combined with geological considerations are two possible ways of inferring its presence.
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    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Sand-box and Hele-Shaw models were used to study waste water injection into two-phase ground-water bodies. Two types of experiments were conducted: “static” experiments in which there was no movement of the fresh ground-water body with respect to the underlying salt water prior to waste injection, and “dynamic” experiments in which a fresh ground-water flow field was present prior to and during waste injection. During every experiment conducted in this study, buoyant plumes of injected effluent, which were clearly distinct from the resident aquifer liquids, formed and migrated upward into the lower portion of the fresh-water body. Three injection parameters exerted significant control on the movement of the injection plumes; the rate of effluent injection and the strength of the ambient fresh-water flow field significantly influenced both the vertical and lateral migration of the plumes, and the depth of effluent injection (with respect to the salt/ fresh-water interface) influenced the over-all shape of the plumes as well as the lateral migration of the plumes. The principal means of plume movement in these experiments appears to be by fluid displacement processes, rather than by dispersion processes.
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    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: There is a spectrum of sea-level fluctuations that affect the water table of a small, permeable oceanic island. At the high-frequency end of the spectrum are the semi-diurnal and diurnal components of the astronomical tides. Also affecting sea-level elevation are atmospheric pressure and the temperature and salinity (hence density) of the ocean column.Changes in atmospheric pressure cause sea-level changes on the order of up to about 30 cm, by what oceanographers call the “inverted barometer effect.” As a result, pressure changes, like tides, generate waves that migrate across the water table. Amplitudes of the resultant pressure-related water-table fluctuations diminish inland. However, owing to the relatively long period of the pressure-related fluctuations, their inland attenuation is far less than that of the hydraulically analogous tides. In fact, in Bermuda for example, the pressure-related water-table fluctuations completely dominate water-table statistics that reflect day-to-day changes in elevation.Because a drop in pressure and corresponding rise in the water table accompanies passage of a storm front, which also brings a rainfall, there is commonly a coincidental, and very misleading, correlation between rainfalls and water-table rises. In island and coastal settings, non-tidal sea-level changes and their effect on the water table must be taken into account, if recharge is to be correctly evaluated from water-table data.
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    Notes: Field and laboratory tests were made using suspensions of baker's yeast (Saccharomyces cerevisiae) to trace movement of microbes in artificially recharged ground water. Yeast cells penetrated more than 7 meters into a sand and gravel aquifer in less than 48 hours. It is believed that most of the cells travelled through channels formed by the solution of calcium carbonate rather than through intergranular pores. Ease and sensitivity of detection, coupled with negligible background correction, suggest that baker's yeast is an excellent choice as a tracer for this type of application.
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    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Abstract. Hydrogeologic and geochemical investigations have recently been made at an existing municipal supply well in the Town of Pembroke, Massachusetts, to determine the feasibility of using the Vyredox Method (Hallberg and Martinell, 1976) to remove iron and manganese from the ground water. The unique Vyredox testing procedures confirmed the existence of an active iron and manganese precipitating bacteria colony in the productive zone of the aquifer, which was causing rapid plugging of the well.
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    Notes: The impact of the use of a heat pump for residential heating and cooling on ground-water temperatures was simulated by means of a mathematical model which couples the equations for ground-water flow with those for heat transport. A hypothetical case using data typical for southern Wisconsin was considered. Water was pumped from and recharged to a sandstone aquifer using a two-well system. Water was withdrawn from a deep well and injected into a shallow well during the heating cycle and during the cooling cycle the system was operated in reverse. After ten years of operation, water temperatures in the aquifer had changed less than one degree centigrade at a distance of greater than 40 meters from the wells. For the case considered, the use of heat pumps for residential heating and cooling would not adversely lower ground-water temperatures if use were restricted to sparsely populated areas. It is recommended that statutes which prohibit the injection of water directly into the subsurface be changed to allow the use of ground-water heat pumps.
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    Notes: With the aid of a computer, and using an iterative alternating-direction implicit method, a numerical solution is sought for the unsteady-state radial flow to partially penetrating wells pumping at a constant rate from an unconfined anisotropic aquifer. These solutions are used to generate a series of theoretical type curves valid for individual aquifer-test situations characterized by particular combinations of two constants Q = (Pr/Pz) (m/rw)2 and C2= (Sy/Ssm) and particular well penetration. The aquifer-test data requirements are the time-drawdown data and at least two pairs of observation wells, one of the pair tapping well-screen depths and the other tapping water-table depths. The parameters that are identified are the lateral permeability, vertical permeability, specific storage and specific yield of the aquifer. The use of the type curves is illustrated by an example.
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    Notes: Abstract. The uses of water for nuclear power plants consist of the following: service water, emergency cooling water, domestic (potable, sanitary), construction, and fire fighting. The quantity of water for these various uses may range from 10 gpm (0.63 1/s) for domestic supplies to greater than 100,000 gpm (6309 1/s) for service water and emergency cooling water supplies. Historically, the source of water for nuclear power plant use has been surface-water bodies, such as rivers, lakes, oceans, and man-made canals. Ground-water sources have supplied relatively small quantities of water for plant use, mainly domestic and construction supplies. A survey of 123 nuclear power plant sites which are either built, under construction, or planned, revealed that about 3 percent of all plant water supplies is derived from ground-water sources. Presently, four nuclear power plants intend to use ground water in relatively large quantities (as service water and emergency cooling water). Two of these plants will use ground water via induced infiltration from radial collector wells, and the other two plants intend to withdraw ground water from deep wells (1,000 feet) from a confined aquifer. Another plant, under construction, intends to use sewage effluent which is originally derived from a combination of surface and ground water.
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    Notes: Numerical simulation models of the simultaneous transport of water and heat in porous media offer a useful technical tool for the evaluation of aquifers for the storage of heat energy. During the past several years, such models have been developed in the U.S. Geological Survey and in other institutions and have been tested by comparing computed results with analytical solutions. To more completely assess the performance of these simulation models, the U.S. Geological Survey and the Energy Research and Development Agency co-funded Auburn University to conduct a field experiment of heat storage in an aquifer near Mobile, Alabama. The data collected during the experiment were analyzed, and a simulation model of the aquifer system was constructed. Simulation of the experiment history indicates that the model can satisfactorily reproduce the observed behavior of the system. Heat capacity of the aquifer matrix and anisotropy of the aquifer permeability were found to be significant system parameters. An extensive evaluation of parameter sensitivity was not possible because experimental problems resulted in some unreliable data, but the utility of numerical models for simulating thermal energy storage in aquifers was clearly demonstrated.
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    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: During a seven-month sampling period surface-water, ground-water, and shallow subsurface temperatures were measured at a well field in the Coastal Plain province in southeastern Pennsylvania in an attempt to delineate zones of relatively greater permeability in the underlying glacial outwash materials. Temperature measurements were made at monthly intervals using a tele-thermometer equipped with a thermistor. Subsurface temperatures were taken at a depth of six feet (183 cm) in a network of 66 access holes.In order to recognize perturbations in the subsurface thermal regime, theoretical conductive heat flow calculation: of the temperature variation expected to occur at a depth of six feet (183 cm) were compared to the observed temperature variation measured in the network of access holes. Isothermal maps, contouring equal temperatures at a specific time, and isallothermal maps, contouring equal temperature changes in a specific time interval, were constructed from the access hole data. These maps facilitated the identification of areas not conforming to the predicted value of annual subsurface temperature variation.Anomalous areas were found to represent regions where differing land-use practices or ground-water movement perturbed the normal thermal regime. Access hole temperatures measured in areas not covered by a dense vegetative cover or a tree canopy were found to have greater temperature variation than predicted. Areas where the temperature variation in the access holes was less than predicted were found to overlie known zones of relatively greater permeability in the underlying materials.
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    Notes: The hypothesis that present-day ground-water gradients in arid regional sedimentary basins are a decay feature of very old recharge mounds is examined using a resistance network analogue. A longitudinal section model of a conceptual basin with some specific control of aquifer permeability and ground-water age is used.With reasonable combination of aquifer permeability and specific yield it is shown that an acceptable head decay could have occurred over the past 10,000 years to produce the present-day gradient. In the model adopted, decreasing permeability with depth was found to be required to accord with 14C ground-water age data.Although the model is not considered to be definitive for any particular aquifer the results show that fossil gradient conditions could exist in the regional basins for long periods and should be taken account of in ground-water resources assessments.
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    Notes: The analysis of flow to a flowing nonpenetrating well in a leaky artesian aquifer was obtained. A method has been suggested to determine the aquifer parameters using the pump-test data on such wells with constant drawdown in the well. A technique is also suggested to determine the aquifer parameters using the well itself as the observation well.
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    Notes: Aquifers are basically water storage reservoirs and need to be used as such to optimally integrate them into the water resource system. They have five special properties that dictate how they should be used to store water. These are size, their response time, the quality of water they hold, the ecological impacts of using them, and the type of investment needed to develop them. To be most effective, all of the available storage of an aquifer should be utilized and the quality of the ground water maintained, but neither of these requirements are totally met and in many areas are dangerously ignored. In order to realize the full potential of the aquifer benefits, regional cooperation or control is necessary.
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    Notes: Ground-water samples from a portion of a semi-confined buried glacial channel aquifer in southeastern Saskatchewan, Canada, were collected and analyzed to determine the spatial and temporal variations of the major chemical constituents, pH, Eh and Fe. Dilute Ca-HCO3 type water characterized the shallow portion of the aquifer. There was a linear modified Piper Plot trend toward more concentrated Na-SO4 type water with increasing depth in the aquifer and with increased distance along the ground-water flow path. Ground water flowing from a well penetrating the shallow portion of the aquifer responded chemically to an intense spring storm event. The ground-water chemistry of a flowing well completed in the deep portion of the aquifer did not respond to this intense spring storm, but showed a temporal chemical trend which paralleled a midsummer recharge event. The spatial and temporal hydrogeochemical variations indicate that two chemically distinct ground-water components, resulting from two different physico-chemical ground-water flow origins, are probably recharging and mixing within this portion of the buried channel aquifer.
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    Notes: The simulation of water table responses is discussed and the use of multiple linear regression as a modelling technique is considered. It is calibrated and validated against actual field data from the Vryburg aquifer in South Africa. The model permits the consideration of changes in properties of recharge, discharge and aquifer parameters simultaneously. By use of such a model, water table responses in the Vryburg area can be simulated six years ahead of time, using rainfall and discharge through pumping as the only input parameters. This technique can be regarded as a rapid, first approximation and low-cost procedure which is unsurpassed as far as time and costs are concerned.
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    Notes: Nepco Lake is a 494-acre impoundment in the sand plain province of central Wisconsin, an area characterized by a close relationship between ground water and surface water. A study of the ground-water flow pattern and ground-water quality in the vicinity of Nepco Lake was conducted for an 11-month period from June 1976 to April 1977.The ground-water flow system around Nepco Lake is different from systems for natural lakes previously reported in the literature, in that there are no strong vertical head gradients in the nearshore areas. This phenomenon may be typical for impounded lakes. Other aspects of the study included a survey of the water quality within the watershed and the calculation of water budgets for the lake. Variations in water quality can be related to changes in the texture of the aquifer or the nature of the flow system or both. Water budget calculations indicate that direct ground-water discharge into the lake is relatively small compared to surface-water contributions. Nevertheless, ground water in the Nepco Lake Watershed should be carefully managed because of the close relationship between ground water and surface water in this area.
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    Notes: This paper suggests a labor-intensive water-supply technique that may be classified as appropriate technology in that it conserves energy and capital (scarce inputs in developing countries) and utilizes labor (an abundant input in these same countries). The problem of collecting rain during the wet season for use during the rest of the year is compounded by evaporation and infiltration losses. Lining a shaped reservoir in a slough or gully can eliminate the infiltration losses; filling the same reservoir with uniform sand and a gravel mulch can greatly reduce the evaporation losses. Thus one creates an artificial aquifer with an appropriate technology which can supply filtered water under gravity flow with minimal maintenance.
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    Notes: Like many States in the American West, Arizona is flooded with conflicting claims to water, a very scarce resource. Conflicts arising from water-rights claims by mining, agricultural and municipal entities are a traditional part of life in Arizona. Indian water-rights claims, however, are a relatively recent development which introduce a significant and troublesome new factor into an already delicate water-supply-and-demand management matrix. These claims are the topic of this paper.Any discussion about legal bases of Indian water-rights claims must begin with an understanding of the U.S. Supreme Court's 1908 decision in the Winters case. In that decision the Court ruled that the U.S. government impliedly reserved water rights for the Indians of the Fort Bethold Reservation in Montana when it withdrew the lands from public domain. The Winters case and subsequent Indian water-rights litigation are reviewed and the impacts on Arizona water-rights claims are projected.Finally, the author suggests that the federal government must develop substitute water sources or augment water supplies for Indians if it is to fulfill its trustee role as defined in Winters doctrine adjudication. Five recommendations are presented for review in considering the possibilities of the two alternatives for government action relevant to solving complex water-rights conflicts in Arizona, recommendations which may be applicable to similar problems in other water-poor regions in the American West.
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    Notes: A numerical model for analyzing pumping tests is used to estimate the transmissivity and the storage coefficient from abstraction well-water levels measured during both the abstraction and recovery phases. The technique is applied to a practical test. In addition, an ideal test is devised and the technique is used to give satisfactory estimates of the parameters.
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    Notes: A mathematical model for estimating daily water levels from less than daily observations was used to analyze an existing water-level observation network on Cape Cod, Massachusetts. The model assumes that the water-level fluctuation curve can be approximated by a simple harmonic function of the form: wl(x)=M+A cos(2π/T×+ C) + Bx where wl(x) is the water level for day number x. M, A, C and B are constants, and T is the harmonic period.The analysis indicated that for those sites which are not affected by tidal fluctuations or man-made influences (such as pumping), six water-level measurements per year would allow daily water levels to be interpolated with a standard error of estimate of about 0.06 meters.
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    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geosciences
    Notes: Temperature logs were used to study the movement of water injected into wells penetrating the Pliocene Ogallala Formation in the High Plains of Texas. Descriptions of the results of three recharge tests are necessary because the hydrologic response to recharge at each site was very different. The water used for artificial recharge of the aquifer was derived from playa lakes in which the diurnal fluctuation of temperature was as much as 17 ° Celsius. Daily thermal cycles that resulted from injection of this water were traced through the aquifer by use of a series of temperature logs made at frequent intervals in cased holes specially constructed for logging. The thermal pulses were detected by logging holes as far as 46 meters (150 ft) from the recharge well.In areas where this technique was used, the Ogallala Formation consists of thick sections of uniform medium-grained sand that visually appear uniform and thus were thought to have uniform hydraulic conductivity. However, the results of temperature logging at each of the three sites clearly demonstrate that the hydraulic conductivity varies greatly through these seemingly uniform lithologic units. Thermal pulse velocities as high as 4.6 meters (15 ft) per hour were found in thin zones immediately adjacent to sand where velocities were a few feet per day. Tracing with temperature logs is potentially useful in locating zones of high intrinsic permeability and in detecting apparent changes in rate of flow as a function of time.
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