Classification of Aquifers Systems in U.S. Fuller, 1905 Meinzer, 1923 Thomas, 1952 RASA, 1978 Heath, 1984 Heath, 1988 Hydrogeologic Atlas, 1990s. 21 regions, based on bedrock aquifers. Aquifer Regions in U.S. according to Meizner, 1923. Combined and simplified to 10 regions.
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Aquifer Regions in U.S. according to Meizner, 1923
Aquifer Regions in U.S. according to Thomas, 1952
28 regions, extensive aquifers that act as single unit, independent aquifers with common characteristics
Classification based on watersheds
USGS Professional Paper 813
1. Component aquifers—unconfined, confined, multiple
2. Porosity—primary, secondary
3. Aquifer composition
4. Storage and Transmission characteristics