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Online Guide to MODFLOW

Navigation: Observation Process

HOB - Head-Observation Package

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Abbreviation in Name file

HOB

Purpose

The Head-Observation input file is used to specify observations of head for use in the Observation process.

Documentation

Hill, M.C., Banta, E.R., Harbaugh, A.W., and Anderman, E.R., 2000, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- User guide to the Observation, Sensitivity, and Parameter-Estimation Processes and three post-processing programs: U.S. Geological Survey Open-File Report 00-184, 210 p.

release.txt

ofr-00-184-errata.pdf

OBS.pdf

Related Packages

Observation Process input files

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Input Instructions

Input for the Head-Observation input file is read from a file that is specified with "HOB" as the file type in the name file.

Data Set 0

[#Text]

Item 0 is optional and can include as many lines as desired. Each line needs to begin with the “#” character in the first column.

Data Set 1

MODFLOW-2000:

NH MOBS MAXM (free format)

MODFLOW-2005:

NH MOBS MAXM IUHOBSV HOBDRY [NOPRINT] (free format)

MODFLOW-CFP, MODFLOW-NWT, MODFLOW-OWHM, and MODFLOW-LGR:

NH MOBS MAXM IUHOBSV HOBDRY (free format)

Data Set 2

MODFLOW-2000:

TOMULTH EVH (free format)

MODFLOW-2005, MODFLOW-CFP, MODFLOW-NWT, MODFLOW-OWHM, and MODFLOW-LGR:

TOMULTH

Read sufficient repetitions of item 3 and, optionally, items 4 through 6 to obtain NH head or change-in-head observations.

Data Set 3

MODFLOW-2000:

OBSNAM LAYER ROW COLUMN  IREFSP TOFFSET ROFF COFF HOBS  STATISTIC STAT-FLAG  PLOT-SYMBOL (free format)

MODFLOW-2005, MODFLOW-CFP, MODFLOW-NWT, MODFLOW-OWHM, and MODFLOW-LGR:

OBSNAM LAYER ROW COLUMN IREFSP TOFFSET ROFF COFF HOBS (free format)

If LAYER is less than zero, hydraulic heads from multiple layers are combined to calculate a simulated value. The number of layers equals the absolute value of LAYER, or |LAYER|.

Data Set 4

MLAY(1), PR(1), MLAY(2), PR(2), ..., MLAY(|LAYER|), PR(|LAYER|) (free format)

Sufficient repetitions of item 4 are read to define the contributions from each layer. The order of the layers needs to be specified according to the method presented in figure 4.

Data Set 5

ITT (free format)

If IREFSP in item 3 is less than zero, read item 5.

Data Set 6

MODFLOW-2000:

OBSNAM IREFSP TOFFSET HOBS STATh STATdd  STAT-FLAG PLOT-SYMBOL (free format)

MODFLOW-2005, MODFLOW-CFP, MODFLOW-NWT, MODFLOW-OWHM, and MODFLOW-LGR:

OBSNAM IREFSP TOFFSET HOBS (free format)

If IREFSP in item 3 is less than zero, read item 6 for each of IREFSP observation times

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