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

HFB6 - Horizontal Flow Barrier Package

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Abbreviation in Name file

HFB6

Purpose

The Horizontal Flow Barrier package is used to simulate barriers to flow such as slurry walls by reducing the conductance between individual pairs of 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.

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

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

Hsieh, P.A., and Freckleton, J.R., 1993, Documentation of a computer program to simulate horizontal-flow barriers using the U.S. Geological Survey modular three- dimensional finite-difference ground-water flow model: U.S. Geological Survey Open-File Report 92-477, 32 p.

release.txt

ofr-00-92-errata.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

One of the flow packages, Block-Centered Flow package (BCF), Layer-Property Flow package (LPF) or the Hydrogeologic-Unit Flow package (HUF2) sets the conductance between cells that is modified by the Horizontal Flow Barrier package.

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

The "Model-Layer Variable-Direction Horizontal Anisotropy" (LVDA) capability is incompatible with the Horizontal Flow Barrier package.

The capability of routing flow between non-adjacent cells can only be used with the NWT solver and is only included in MODFLOW-OWHM.

For vertical barriers, the layers must be adjacent to one another.

Input Instructions

The Horizontal Flow Barrier Package is documented in Hsieh and Freckleton (1993). Input for the Horizontal Flow Barrier (HFB) Package is read from the file that has file type “HFB6” in the name file. The file type has been changed from that used in MODFLOW-96, which was “HFB”, because the input data are not compatible. All variables are read in free format.

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

NPHFB MXFB NHFBNP  [MXHFBNP] Option

Repeat Items 2 and 3 for each NPHFB parameter. Items 2 and 3 are not read if NPHFB is negative or zero.

Data Set 2

PARNAM PARTYP Parval NLST

Data Set 3

Layer IROW1 ICOL1 IROW2  ICOL2 Factor [Layer2]

NLST repetitions of Item 3 are required; they are read by module ULSTRD. (SFAC of the ULSTRD utility module applies to Factor).

If IROW1=IROW2 and ICOL1=ICOL2 and ABS(Layer2- Layer)=1, then there is no flow routing, but instead the barrier is changed to a vertical barrier between layers and will work with any solver package.

FOR FIRST STRESS PERIOD OR ALL STRESS PERIODS

Data Set 4

Layer IROW1 ICOL1 IROW2  ICOL2 Hydchr [Layer2]

NHFBNP repetitions of Item 4 are read. Item 4 is not read if NHFBNP is negative or zero.

If IROW1=IROW2 and ICOL1=ICOL2 and ABS(Layer2- Layer)=1, then there is no flow routing, but instead the barrier is changed to a vertical barrier between layers and will work with any solver package.

Data Set 5

Data Set 6

Pname

NACTHFB repetitions of Item 6 are read. Item 6 is not read if NACTHFB is negative or zero.

OPTIONAL: FOR EACH SUBSEQUENT STRESS PERIOD Data Sets 7-9 are only included in MODFLOW-OWHM

Data Set 7 (only in MODFLOW-OWHM)

NACTHFB NHFBNP

If NACTHFB is set to –1, then NHFBNP and items 8 and 9 are not read. Instead the barriers defined in the previous stress period are used. If MXHFBP is 0, then NHFBNP is not read in since it cannot be larger than 0.

 

Data Set 8 (only in MODFLOW-OWHM)

Pname

NACTHFB, from item 7, repetitions of Item 8 are read. Item 8 is not read if NACTHFB is negative or zero.

 

Data Set 9 (only in MODFLOW-OWHM)

Layer IROW1 ICOL1 IROW2 ICOL2 Hydchr [Layer2]

NHFBNP, from item 7, repetitions of Item 9 are read. Item 9 is not read if NHFBNP or MXHFBP is negative or zero.