Figure 8. Change in interpretation of aquifer boundaries over time. a. 1979 sand and gravel aquifers map (scale 1:50,000). b. 1985 significant aquifers map (scale 1:50,000). c. Current edition of significant aquifers map, published in 1999 (scale 1:24,000). Note how the interpretation of aquifer boundaries has changed as more data was collected. Note especially how the high-yield (red) areas have shrunk, representing a more conservative estimate of the potential yield of the aquifer. For a more detailed discussion, read Sand and gravel aquifer maps - A work in progress.

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Last updated on October 6, 2005

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