Groundwater age dating using tritium

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Approximately 350,000 people, more than half of Alaska’s population, reside in the basin, mostly in the Anchorage area.However, rapid growth is occurring in the Matanuska– Susitna and Kenai Peninsula Boroughs to the north and south of Anchorage.This document is also available in pdf format: fs-022-02(1.0 MB) The Cook Inlet Basin (Fig.1) encompasses 39,325 square miles in south-central Alaska.

Wells that have long screened intervals may produce a mixture of water from several parts of an aquifer system that have different recharge areas and flow paths, which would yield different ground-water ages.

Groundwater ages of the medium-depth groundwater ranged from 3.5–25,790 a.

Groundwater is relatively young in most of the piedmont area, although two high-age zones (with ages 20,000 a) exist in the center of the plain.

2) in unconsolidated glacial and alluvial aquifers during 1999 to determine the regional quality of ground water beneath about 790 mi of developed land and to gain a better understanding of the natural and human factors that affect the water quality (Glass, 2001).

Of the 35 wells sampled, 31 had water analyzed for atmospherically derived substances to determine the ground water’s travel time from its point of recharge to its point of use or discharge—also known as ground-water age.

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