USGS - science for a changing world

USGS Groundwater Information: Branch of Geophysics

*  Home *  Resources *  Research *  Publications *  About *  Contact Us *  Groundwater Information

Complete PDF version of this document (615KB)

Effects of lithology and fracture characteristics on hydraulic properties in crystalline rock: Mirror Lake Research Site, Grafton County, New Hampshire

By Carole D. Johnson

Abstract

A combination of subsurface borehole imaging data and drilling logs were used to characterize the fractures and lithology in 40 bedrock wells at the fractured-rock research site in the Mirror Lake area in Grafton County, New Hampshire. The purpose of the research was to determine whether subsurface lithology and fractures have an effect on the hydraulic conductivity of the crystalline-rock aquifer in the Mirror Lake area. The distribution of fractures and lithology was quantified with respect to depth, altitude, topographic setting, and spatial distribution. The density of fracturing was described and comparisons were made between lithology, fracture characteristics, and hydraulic-conductivity measurements. Fracturing was found to be related to lithology, depth, and topographic setting. No clear correlation was established between hydraulic conductivity and fracture properties including alteration, oxidation, aperture, orientation, and density.


Citation: Johnson, C.D., 1999, Effects of lithology and fracture characteristics on hydraulic properties in crystalline rock--Mirror lake Research Site, Grafton County, New Hampshire, in Morganwalp, D.W., and Buxton, H.T., eds., U.S. Geological Survey Toxic Substances Hydrology Program-Proceedings of the Technical Meeting, Charleston, South Carolina, March 8-12, 1999: U.S. Geological Survey Water-Resources Investigation Report 99-4018C, v. 3, p. 795-802.


Note: Download free Adobe Acrobat Reader to view PDF files at the Adobe web site.
Visit http://access.adobe.com for free tools that allow visually impaired users to read PDF files.

USGS Home Water
Climate and Land Use Change Core Science Systems Ecosystems Energy and Minerals Environmental Health Natural Hazards

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://water.usgs.gov/ogw/bgas/publications/RTS-NH-0461/index.html
Page Contact Information: Contact the OGW Branch of Geophysics
Page Last Modified: Thursday, 03-Jan-2013 20:04:20 EST