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

Figure 1.5B

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EXPLANATION

Difference in recharge, in

millimeters per year

≤−250

>−250 to −100

>−100 to −50

>−50 to −25

>−25 to 0

>0 to 25

>25 to 50

>50 to 100

>100 to 250

>250

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 1.5B. Differences in recharge in the glaciated conterminous United States computed by the soil-water balance model in this study minus the soil-water balance model in Reitz and others (2017).

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