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Navigation: Online Guide to MODFLOW > Groundwater Flow Process > Groundwater Flow Packages

LPF - Layer-Property Flow Package

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Abbreviation in Name file

LPF

Purpose

The Layer-Property Flow package is used to specify properties controlling flow between cells.

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.

ofr-00-92-errata.pdf

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, variously p.

release.txt for MODFLOW-2005

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., https://dx.doi.org/10.3133/tm6A51.

Related Packages

The Block-Centered Flow package (BCF) and the Hydrogeologic-Unit Flow package (HUF2) are two other packages that can be used to specify properties controlling flow between cells.

The Horizontal Flow Barrier (HFB) package modifies the horizontal conductances between certain, specified pairs of cells.

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

Every model must  use one and only one of the four packages (BCF6, LPF, HUF2, and UPW) that are used to specify properties controlling flow between cells. UPW is only available in MODFLOW-NWT and MODFLOW-OWHM.

See the Frequently Asked Questions for information on how to read data from binary files generated by MODFLOW.

The SOR solver (not included in MODFLOW-2005) doesn't work well with the wetting capability.

An option to print property arrays in the LPF and UPW packages to separate files can be activated in the PVAL file in MODFLOW-OWHM.

Input Instructions

Input for the Layer-Property Flow (LPF) Package is read from the file that is type "LPF" in the name file.  Free format is used for reading all values. The LPF Package is an alternative to the BCF Package and HUF2 Package. No more than one of these packages should be used simultaneously.

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

ILPFCB HDRY NPLPF [Options]

Data Set 2

Data Set 3

Data Set 4

Data Set 5

Data Set 6

Data Set 7

[WETFCT IWETIT IHDWET]

(Include item 7 only if LAYWET indicates at least one wettable layer.)

Repeat Items 8-9 for each parameter to be defined (that is, NPLPF times).

Data Set 8

[PARNAM PARTYP Parval NCLU]

Data Set 9

[Layer Mltarr Zonarr IZ]

Each repetition of Item 9 is called a parameter cluster. Repeat Item 9 NCLU times.

A subset of the following two-dimensional variables is used to describe each layer. All the variables that apply to layer 1 are read first, followed by layer 2, followed by layer 3, and so forth. If a variable is not required due to simulation options (for example, Ss and Sy for a completely steady-state simulation), then it must be omitted from the input file.

These variables are either read by the array-reading utility module, U2DREL, or they are defined through parameters. If a variable is defined through parameters, then the variable itself is not read; however, a single record containing a print code is read in place of the array control record. The print code determines the format for printing the values of the variable as defined by parameters. The print codes are the same as those used in an array control record. If any parameters of a given type are used, parameters must be used to define the corresponding variable for all layers in the model.

Data Set 10

HK(NCOL,NROW)- U2DREL

If there are any HK parameters, read only a print code.

Data Set 11

[HANI(NCOL,NROW)]- U2DREL

Include item 11 only if CHANI is less than or equal to 0. If there are any HANI parameters, read only a print code.

Data Set 12

VKA(NCOL,NROW)- U2DREL

If there are any VK or VANI parameters, read only a print code.

Data Set 13

[Ss(NCOL,NROW)]- U2DREL

Include item 13 only if at least one stress period is transient. If there are any SS parameters, read only a print code.

Data Set 14

[Sy(NCOL,NROW)]- U2DREL

Include item 14 only if at least one stress period is transient and LAYTYP is not 0. If there are any SY parameters, read only a print code.

Data Set 15

[VKCB(NCOL,NROW)]- U2DREL

Include item 15 only if LAYCBD (in the Discretization File) is not 0. If there are any VKCB parameters, read only a print code.

Data Set 16

[WETDRY(NCOL,NROW)]- U2DREL

Include item 16 only if LAYWET is not 0 and LAYTYP is not 0.