USGS Scientific Investigations Report 2018-5091: Characterization and Occurrence of Confined and Unconfined Aquifers in Quaternary Sediments in the Glaciated Conterminous United States

Figure 23C

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EXPLANATION

Percentage of public-supply groundwater

withdrawals from Quaternary sediments

0 to 5

>5 to 10

>10 to 15

>15 to 20

>20 to 30

>30 to 40

>40 to 50

>50 to 75

>75 to 100

>100

Counties with no public-supply withdrawals

Hydrogeologic terrane boundaries—Alphanumeric code indicates the

generalized complexity of the hydrogeologic framework in each terrane

Sediment thickness contrast

Major river

Maximum extent of glacial ice

Extent of Late Wisconsinan ice

Figure 23C. Percentage of public-supply groundwater withdrawals from Quaternary sediments, by county, in the glaciated conterminous United States.

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