Jayne Fifield Knott and Julio C. Olimpio
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Abstract
Introduction
Background
Purpose and Scope
Location and physical setting
Acknowledgments
Geohydrology of the sand and gravel aquifer on Nantucket
Choice of the aquifer
Description of the study sites
Field instrumentation
Hydrologic factors influencing well design and sampling interval
Description of observation wells and water samplers
Estimation of recharge rates using tritium
Source of tritium
Tritium as a ground-water tracer
Theory
Tritium input function
Tritium concentrations in Nantucket ground water
Calculation of the average annual recharge rate
Evaluation of the results of the tritium method
Discrepancy between calculated and observed tritium concentrations
Statistical uncertainty
Comparison of the tritium estimates with other recharge-rate estimates
Analysis of water-table fluctuations
Thornthwaite method
Recharge rates in southeastern Massachusetts
Summary and conclusions
Selected references
Metric conversion factors
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U.S. Department of the Interior, U.S. Geological Survey
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