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Data Sets Required by MT3DMS or MT3D-USGS

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Data Set

Description

MT3DMS Package

MT3DMS Equivalent

When used

Porosity

Specifies the porosity.

Basic

PRSITY

Always

Longitudinal_Dispersivity

Specifies the longitudinal dispersivity.

Dispersion

AL

When the Dispersion package is used

MT3DMS_Observation_Locations

Cell containing anobservation point for which the concentration is to be printed at every transport step in file MT3Dnnn.OBS

Basic

Data Sets 18 and 19

Always

MT3DMS_Active

Indicates whether a cell is active in MT3DMS or not. Not all active MODFLOW cells are required to be active MT3DMS cells.

Basic

ICBUND

Always

Bulk_Density

the bulk density of the aquifer medium

Chemical Reaction

RHOB

When the chemical reaction package is used and the sorption choice is Linear, Freundlich, Langmuir, first order kinetic, or dual domain with sorption

Immobile_Domain_Porosity

the porosity of the immobile domain, i.e., the ratio of pore spaces filled with immobile fluids over the bulk volume of the aquifer medium, when the simulation is intended to represent a dual-domain system

Chemical Reaction

PRSITY2

When the chemical reaction package is used and dual porosity is selected.

MT3DMS_Layer_Thickness

The thickness of a layer

Basic

DZ