||Bedrock Regional Aquifer Systematics Study
1. Southern New Hampshire studies As part of a statewide ground water assessment conducted by the New Hampshire Department of Environmental Services and the USGS-WRD NH-VT District, the Pinardville and Windham 7.5-minute quadrangles were mapped by Thomas Armstrong and William Burton, and Gregory Walsh and Stewart Clark, respectively. These quadrangle maps were chosen because they contain the greatest number of drilled bedrock wells in the State, and were used by the USGS as part of a statewide analysis of factors contributing to well yield. The Pinardville quadrangle was also used in statistical studies that investigated bedrock geologic controls on well yields, producing papers on yield to depth relations and exploratory variography. Joint data from the Windham quadrangle were used in a study of contrasting methods of fracture trend characterization in crystalline rocks (see publications, below).
2. Central New Hampshire mapping Burton, Walsh, and Armstrong have produced a bedrock geologic map of the Hubbard Brook Experimental Forest, which is also the Hubbard Brook watershed, and the site of the USGS Mirror Lake fractured-rock research site. Both the mapping and the other USGS research were supported by the USGS Toxic Substances Hydrology Program. Mapping in the Hubbard Brook Experimental Forest is being used to provide regional context to the extensive fractured bedrock hydrogeologic studies underway at the Mirror Lake site, as well as ecological studies of the U.S. Forest Service, which manages the forest. Walsh and Burton also plan to publish a geologic map of the Woodstock quadrangle, which covers the eastern half of the watershed and the Mirror Lake site. In 2004 Janet Stone will produce a surficial map of the Hubbard Brook watershed.
Bedrock Geologic Map of the Windham Quadrangle
Bedrock Geologic Map of the Hubbard Brook Experimental Forest
Factors Related to Well Yield in the Fractured-Bedrock Aquifer of New Hampshire
Geologic mapping and collection of digital geologic structure data [abstract]
Drew, L.J., Karlinger, M.R., Schuenemeyer, J.H., and Armstrong, T.R.,2003, Hydrogeologic significance of the association between well-yield variography and bedrock geologic structures, Pinardville quadrangle, New Hampshire: Natural Resources Research, vol. 12, no. 1, p. 79-91.
Drew, L.J., Schuenemeyer, J.H., Armstrong, T.R., and Sutphin, D.M., 2001, Initial yield to depth relation for water wells drilled into crystalline bedrock-Pinardville quadrangle, New Hampshire: Ground Water, vol. 39, no. 5, p. 676-684.
Drew, L.J., Karlinger, M.R., Armstrong, T.R., and Moore, R.B., 1999, Relations between igneous and metamorphic rock fracture patterns and ground water yield from the variography of water-well yields -- Pinardville quadrangle, New Hampshire: Natural Resources Research, vol. 8, no. 2, p. 137-152.
Walsh, Gregory, J., and Clark, S.F., Jr., 2000, Contrasting methods of fracture trend characterization in crystalline metamorphic and igneous rocks of the Windham quadrangle, New Hampshire: Northeastern Geology and Environmental Sciences, v. 22, no. 2, p. 109-120.
USGS-WRD NH-VT District
USGS Toxic Substances Hydrology Program
NH Department of Environmental Services