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

Figure 1.4A

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EXPLANATION

Residual, in

millimeters per year

≤−100

>−100 to −75

>−75 to −50

>−50 to −25

>−25 to 0

>0 to 25

>25 to 50

>50 to 75

>75 to 100

>100

Recharge, in

millimeters per year

0 to 25

>25 to 50

>50 to 75

>75 to 100

>100 to 125

>125 to 175

>175 to 250

>250 to 325

>325 to 500

>500

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 1.4A. Recharge and spatial distribution of residuals between base flow in the glaciated conterminous United States computed by PART and recharge computed by the soil-water balance model in this study.

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