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Research about New Hampshire

Source-linked reports with geographic coverage including New Hampshire.

At least 163 records · Page 9Linked to original sources
USGS1985

Geophysical well log data for study of water flow in fractures near Mirror Lake, West Thornton, New Hampshire

Four closely spaced boreholes were drilled through approximately 20 meters of till into schist bedrock near Mirror Lake, West Thornton, New Hampshire. The site was selected for borehole geophysical research because it is included in a detailed groundwater study where the effects of flow in fractures on flow in overlying drift deposits is being studied. Three of the boreholes are approximately 100 meters in depth, and the fourth is approximately 230 meters in depth. All four boreholes were logged with caliper, acoustic, gamma, single-point-resistivity, and acoustic televiewer logs. Fracture sets dipping approximately 45 degrees to the east were detected in all four boreholes. Two sets of deeper fractures were detected near the bottom of the deepest borehole. Acoustic waveform logs were obtained in all boreholes using three different source frequencies, 34, 15, and 5 kilohertz, for future comparison with surface to borehole seismic data.

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USGS1982

Trichloroethylene in the ground-water supply of Pease Air Force Base, Portsmouth, New Hampshire

TCE (trichloroethylene) in concentrations that may be hazardous to health occurs in the water of an ice-contact largely sand and gravel aquifer (called the main aquifer) underlying much of the PAFB (Pease Air Force Base). In 1977 and 1978, the highest TCE concentration was found surrounding the most productive well, Haven well. Large quantities of TCE were used for degreasing between 1955 and 1965 and, so far as is known, TCE was used extensively up until 1973. Data on how, where, and when TCE got into the aquifer are lacking, but geochemical evidence and TCE analyses show a strong relation between the high TCE concentrations near Haven well and the extensive storm-drain system that underlies the parking apron and runway. The drains help recycle some of the TCE-contaminated ground water from the Haven well area. Sources of TCE-free ground water on PAFB may exist in the northern parts and do exist in the southern parts of the main aquifer; however, in the southern part, either the ground water is probably already being used nearly to capacity (Smith and Harrison production wells) or further development might adversely affect off-base ground-water use. In the northern part, available subsurface data indicate that only relatively small yields are likely at any one site; thus, to get sustained yields comparable to that of the Haven well would probably require an unreasonable number of wells. This study locates TCE contamination in the main PAFB aquifer and discusses three possible water-use alternatives: (I) Abandonment of Haven well, (2) treatment of Haven well water to remove TCE, and (3) treatment of a portion of Haven well water for domestic consumption and use of the remainder for nondomestic uses. Continued use of the Haven well, with treatment of all or part of its yield for TCE removal, is advantageous, both because the Haven well is a high-yield source of water and because cessation of pumping from it might allow TCE-contaminated ground water to move downgradient (southward), endangering the Smith and Harrison production wells. Continued study and monitoring of the TCE contamination would help in predicting when the contamination problem will no longer be threatening.

New Hampshire↗
USGS1980

Seismicity map of the State of New Hampshire

This map is one of a series of seismicity maps produced by the U.S. Geological Survey that show earthquake data of individual states or groups of states at the scale of 1:1,000,000. This map shows only those earthquakes with epicenters located within the boundaries of New Hampshire, even though earthquakes in nearby states or countries may have been felt or may have caused damage in New Hampshire.

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USGS1978

Water-quality conditions in southern Rockingham County, New Hampshire

Physical, chemical, and biological characteristics of water were measured at 26 surface-water sites, 17 ground-water sites, and in effluent from two sanitary landfills as part of planning for area-wide waste management in four watersheds within the Southern Rockingham Regional Planning District in Southern New Hampshire.

New Hampshire↗
USGS1978

Selected uranium and uranium-thorium occurrences in New Hampshire

Secondary uranium mineralization occurs in a northwest-trending fracture zone in the Devonian Concord Granite in recent rock cuts along Interstate Highway 89 near New London, New Hampshire. A detailed plane table map of this occurrence was prepared. Traverses using total gamma ray scintillometers throughout the pluton of Concord Granite identified two additional areas in which very small amounts of secondary mineralization occurs in the marginal zones of the body. All three areas lie along the same northwest trend. A ground radiometry survey of a large part of the Jurassic White Mountain batholith was conducted. Emphasis was placed on those areas from which earlier sampling by Butler (1975) had been done. No unusual geological characteristics were apparent around sample localities from which anomalous U and Th had been reported.. The results of this survey confirm previous conclusions that the red, coarse-grained, biotite granite phase of the Conway Granite is more radioactive than other phases of the Conway Granite or other rock types of the White Mountain Plutonic-Volcanic Series. Aplites associated with the Conway Granite were found generally to be as radioactive as the red Conway Granite.

New Hampshire↗
USGS1978

Progress report on hydrologic investigations of small drainage areas in New Hampshire: preliminary relations for estimating peak discharges on rural, unregulated streams

The magnitude and frequency of floods on rural, unregulated streams in New Hampshire with drainage areas between 0.27 and 622 square miles may be estimated from drainage area, main-channel slope, and a precipitation intensity index. Based on multiple-regression analyses of data from 59 gaged sites in New Hampshire and adjacent areas of bordering states, peak discharges for recurrence intervals of 2, 5, 10, 25, 50, and 100 years can be estimated equations. The estimating relations can be applied to streams where flows are not significantly affected by regulation, diversion, or urbanization; where usable manmade storage does not exceed 4.5 million cubic feet per square mile; or where the basin characteristics are within a specified range. The average standard error of the estimate ranged from 35 percent for the 2-year flood to 58 percent for the 100-year flood. (Woodard-USGS)

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USGS1977

Trophic conditions in Lake Winnisquam, New Hampshire

Lake Winnisquam has received treated domestic sewage for approximately 50 years and since June 1961 has been treated with copper sulfate to control the growth of nuisance algae. The Laconia City secondary sewage-treatment plant was upgraded in 1975 to include phosphorus removal. Phosphorus was not removed effectively until early 1976, and, therefore, the 1976 data are considered baseline or pre-phosphorus removal with respect to anticipated changes in the trophic condition of the lake. Effluent from the Laconia State School primary-treatment plant was diverted to the Laconia City plant in October 1976. Dissolved oxygen concentrations showed marked differences between the two basins comprising Lake Winnisquam. Phytoplankton samples showed similarities by algal group for all stations but algal genera varied between the upper and lower basins. Total phosphorus concentrations in the epilimnion ranged from 0.01 to 0.10 milligram per liter, and accumulation of total phosphorus in the hypolimnion resulted in concentrations up to 0.59 milligrams per liter. Chemical states of nutrients varied among the stations corresponding to the degree of depletion of hypolimnetic dissolved oxygen. Dissolved oxygen profiles were used to illustrate zones of algal production, respiration, and bacterial decomposition. The rate of depletion of dissolved oxygen in the hypolimnion was linearly related to time. Because change in the rate of hypolimnetic dissolved oxygen depletion is more easily measured than change of nutrient load in the lake, it is suggested it be used as an indicator of the response of the lake to change in trophic condition.

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USGS1977

Availability of ground water in the lower Merrimack River basin southern New Hampshire

This map, scale 1:125,000, is a preliminary assessment of the availability of ground water in the lower Merrimack River basin in southern New Hampshire. It is a generalization of several hydrogeologic factors and provides a guideline for ground-water exploration, which is useful in water- and land-use planning. It does not describe the absolute quantity or quality of ground water available. The best aquifers in the basin are deposits of stratified sand or sand and gravel of Pleistocene age. Large aquifers of this type occur in places in the Merrimack River valley and in valleys of tributaries to the Merrimack River. Ground water is generally of good chemical quality. Iron and manganese in concentrations greater than the recommended limits for drinking water suggested by the U.S. Public Health Service, however, are not uncommon. (Woodard-USGS)

New Hampshire↗
USGS1977

Availability of ground water in the Piscataqua and other coastal river basins southeastern New Hampshire

This map (scale 1:125,000) is a preliminary assessment of the availability of ground water in the Piscataqua and coastal river basins in New Hampshire. It is a generalization of several hydrogeologic factors and provides a guide for ground-water exploration, which is useful in water- and land-use planning. The best aquifers in the basin are deposits of stratified sand or sand and gravel of Pleistocene age. Large aquifers of this type occur in places in the major river valleys and in interstream areas within the coastal plain. Ground water is generally of good chemical quality. Iron and manganese in concentrations greater than the recommended limits for drinking water suggested by the U.S. Public Health Service, however, are not uncommon. (Woodard-USGS)

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USGS1977

Availability of ground water in the lower Connecticut River basin, southwestern New Hampshire

This map scale 1:125,000 presents a preliminary assessment of the availability of ground water in the lower Connecticut River basin in southwestern New Hampshire. It is a generalization of several hydrogeologic factors and provides a guideline for ground-water exploration useful in water- and land-use planning. It does not describe the absolute quantity or quality of ground water available. The best aquifers in the basin are deposits of stratified sand or sand and gravel of Pleistocene age. Large aquifers of this type occur in places in the Connecticut River valley and in valleys of tributaries to the Connecticut River. Ground water is generally of good chemical quality. Iron and manganese in concentrations greater than the recommended limits for drinking water suggested by the U.S. Public Health Service are not uncommon. (USGS).

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USGS1976

Analysis of slump slip lines and deformation fabric in slumped Pleistocene lake beds

Slumped glacial delta sands and silts exhibit flexural slip folds and low-angle thrust faults where the beds remained coherent during slump deformation. Alternating cross-cutting relationships between f (sub l ) and f (sub r ) fold axial planes indicate that these fold groups are conjugate sets, related to the same slump movement. Analysis of slump fold axis orientations by the separation-angle method yields the fold slip plane and fold slip line. A deformation fabric reference diagram, deduced from fold and thrust fault data, shows a vertical deformation plane that is defined by the pole to the f (sub l ) and f (sub r ) fold slip planes, pole to rotated bedding, pole to thrust faults, and the fold slip lines. Central tendency estimators, Theta , Theta , and P 50 , of distributions of fold azimuths show close agreement, as do dispersion indicators sigma , derived from L values, and (P 84 -P 16 )/2. Fold axis orientations in the slumped mass are normally distributed, but the perpendiculars to deduced slip lines have consistently higher azimuth values than other central tendency values. These results may indicate that the sampling plain biased the populations. In this case, the vector mean is not perpendicular to the deduced slip line. Silt intraclast breccias, containing slump overfolds, appear to have been deposited as noncoherent grain flows in the slump depression subsequent to slump deformation. The distribution of overfold axis orientations is not significantly different from random distributions. Separation-angle analysis of the same lower breccia data yields a valid slip line solution.

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USGS1976

Availability of ground water in the Middle Connecticut River basin, west-central New Hampshire

This report provides a guide for ground-water exploration and for water- and land-use planning and management. Sufficient amounts of water to supply single family homes are available from the bedrock aquifer nearly everywhere in the middle Connecticut River basin. Relatively thin and narrow, unconsolidated aquifers of sand or sand and gravel commonly capable of yielding more than 200 gallons per minute (12.6 litres per second) to properly located and constructed wells are found only in major stream valley.

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USGS1976

Availability of ground water in the middle Merrimack River basin, central and southern New Hampshire

This report provides a guide for ground-water exploration and for water- and land-use planning and management. Sufficient amounts of water to supply single family homes are available from the bedrock aquifer nearly everywhere in the middle Merrimack River basin. Relatively thin and narrow, unconsolidated aquifers of sand or sand and gravel commonly capable of yielding more than 200 gallons per minute (12.6 litres per second) to properly located and constructed wells are found only in major stream valleys.

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