GMS:UPW Package

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MODFLOW
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Packages
Flow:BCF6, HUF, LPF, UPW
Solvers:DE4, GMG, NWT, PCG2,
SAMG, SIP, SOR
Other:BAS6, CHD1, DRN1, DRT1,
EVT1, ETS1, GAGE, GHB1,
HFB1, HUF, LAK3, MNW1,
MNW2, OUT1, RCH1, RIV1,
SFR2, STR1, WEL1, UZF1
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MODFLOW-NWT contains the UPW flow package. The UPW flow package is based on the LPF package but differs in that the rewetting and vertical conductance correction options are not available. It also differs from the LPF package in that it smoothes the horizontal conductance and storage change functions to have a continuous derivatives so they can be solved by the Newton method. Using the UPW package requires using the NWT solver.

For more information on the UPW package see the USGS documentation here. [1]

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