The feasibility of making regional estimates of ground-water
resources has been demonstrated in Minnesota. Average annual
ground-water recharge rates were used as an indicator of groundwater
resources. Ground-water resources are defined here as the
amount of ground water that can be withdrawn from water-table
aquifers for a long period of time without irreversible depletion
of the ground-water reservoir. In contrast ground-water reserves
are a function of the areal extent, thickness and hydrogeologic
parameters of the aquifers and confining beds. Data from three
research approaches were used to estimate ground-water resources:
( 1) ground-water contribution to the streamflow; (2) 3D-day lowflow
characteristics of Minnesota streams; (3) ground-water
hydrographs. Comparison of results of the three methods shows that
values derived from ground-water hydrographs and data on groundwater
contribution to streams are relatively close. Values derived
from low-flow data, however, were consistently smaller. This
discrepancy is related to two factors: (1) the limited time for
which records of low-flow measurements were available; (2) the
severely limited accuracy of low-flow estimates. However, the use
of all three methods in conjunction does provide meaningful estimates
of ground-water resources; The study shows regional distribution
of ground-water resources in the 39 watersheds in Minnesota.
The general distribution of ground-water resources is due to three
major factors -- hydrogeologic environment, geomorphology and climate.
The general trend is a decrease in ground-water resources
from southeast to west and north in Minnesota.
Kanivetsky, R., 1979, Regional Approach to Estimating the Ground-Water Resources of Minnesota, Minnesota: Minnesota Geological Survey Report of Investigations 22, 13 p.
RI-22 Regional Approach to Estimating the Ground-Water Resources of Minnesota.
Minnesota Geological Survey.
Retrieved from the University of Minnesota Digital Conservancy,
Content distributed via the University of Minnesota's Digital
Conservancy may be subject to additional license and use
restrictions applied by the depositor.