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Online Guide to MODFLOW-NWT

Navigation: Groundwater Flow Process

DIS - Discretization File

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Abbreviation in Name file

DIS

Purpose

The Discretization File  is used to specify certain data used in all models. These include

1.the number of rows, columns and layers

2.the cell sizes

3.the presence of Quasi-3D confining beds

4.the time discretization

Documentation

Harbaugh, A.W., Banta, E.R., Hill, M.C., and McDonald, M.G., 2000, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- User guide to modularization concepts and the Ground-Water Flow Process: U.S. Geological Survey Open-File Report 00-92, 121 p.

Mf2k.txt

Harbaugh, A.W., 2005, MODFLOW-2005, the U.S. Geological Survey modular ground-water model -- the Ground-Water Flow Process: U.S. Geological Survey Techniques and Methods 6-A16. https://doi.org/10.3133/tm6A16

RevisedMF2005Input.pdf

Hanson, R.T., Boyce, S.E., Schmid, Wolfgang, Hughes, J.D., Mehl, S.M., Leake, S.A., Maddock, Thomas, III, and Niswonger, R.G., 2014, One-Water Hydrologic Flow Model (MODFLOW-OWHM): U.S. Geological Survey Techniques and Methods 6–A51, 120 p., http://dx.doi.org/10.3133/tm6A51.

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

The Discretization File is required in all models.

Certain packages or processes including HUF2 and GWT may place restrictions on the allowable discretization.

Input Instructions

Discretization information is read from the file that is specified by "DIS" as the file type.

FOR EACH SIMULATION

Data Set 0

[#Text]

Item 0 is optional—“#” must be in column 1. Item 0 can be repeated multiple times.

Data Set 1

NLAY NROW NCOL NPER  ITMUNI LENUNI

Data Set 2

Data Set 3

DELR(NCOL) - U1DREL

Data Set 4

DELC(NROW) - U1DREL

Data Set 5

Top(NCOL,NROW) - U2DREL

Data Set 6

BOTM(NCOL,NROW) - U2DREL

Item 6 is repeated for each model layer and Quasi-3D confining bed in the grid. These layer variables are read in sequence going down from the top of the system. Thus, the number of BOTM arrays must be NLAY plus the number of Quasi-3D confining beds.

FOR EACH STRESS PERIOD

Data Set 7

PERLEN NSTP TSMULT Ss/tr [STARTTIME StartingYear]

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