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.
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://pubs.usgs.gov/tm/2005/tm6A16/
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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://pubs.usgs.gov/tm/2005/tm6A16/
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.
Text—is a character variable (199 characters) that starts in column 2. Any characters can be included in Text. The “#” character must be in column 1. Except for the name file, lines beginning with # are restricted to these first lines of the file. Text is printed when the file is read.
NPHFB—is the number of horizontal-flow barrier parameters to be defined in Items 2 and 3. Note that for an HFB parameter to have an effect in the simulation, it must be defined in Items 2 and 3 and made active using Item 6 to have an effect in the simulation.
PARNAM—is the name of a parameter. This name can consist of 1 to 10 characters and is not case sensitive. That is, any combination of the same characters with different case will be equivalent. All parameter names must be unique.
PARTYP—is the type of parameter. For the HFB Package, the only allowed parameter type is HFB, which defines values of the hydraulic characteristic of the barrier.
Factor—is the factor used to calculate hydraulic characteristic from the parameter value. The hydraulic characteristic is the product of Factor and the parameter value.
Data Set 4
Layer IROW1 ICOL1 IROW2 ICOL2 Hydchr
NHFBNP repetitions of Item 4 are read. Item 4 is not read if NHFBNP is negative or zero.
Hydchr—is the hydraulic characteristic of the horizontal-flow barrier. The hydraulic characteristic is the barrier hydraulic conductivity divided by the width of the horizontal-flow barrier.
