U.S. Geological Survey Toxic Substances Hydrology Program--Proceedings
of the Technical Meeting, Colorado Springs, Colorado, September 20-24, 1993,
Water-Resources Investigations Report 94-4015
  
Factors Affecting Recharge to Crystalline Rock in the Mirror
Lake Area, Grafton County, New Hampshire
by
Philip T. Harte (U.S. Geological Survey, Bow, NH) and Thomas
C. Winter (U.S. Geological Survey, Lakewood, CO)
Abstract
The effects of local and regional-flow processes on recharge to crystalline
rock are investigated by use of numerical, cross-sectional models of ground-water
flow, comparison of vertical-head gradients between lower piezometers in
drift and upper bedrock wells, and chemical mass-balance models of net differences
in water chemistry. This paper describes factors that control recharge to
crystalline rock in the Mirror Lake area. Four principal factors that affect
bedrock-recharge patterns are (1) relief of land and bedrock surface above
ground-water discharge areas, (2) lateral trends in bulk-rock horizontal
hydraulic conductivity, (3) local topographic features, and (4) drift stratigraphy.
Factors 1 and 2 control the regional distribution of bedrock recharge, whereas
the local distribution of bedrock recharge is controlled by factors 3 and
4.
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