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Online Guide to MODFLOW

Navigation: Observation Process

CHOB - Specified-Head Flow Observation Package

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Abbreviation in Name file

CHOB

Purpose

The Specified-Head Flow Observation input file is used to specify observations of flow through constant-head boundaries 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

OBS.pdf

Related Packages

Observation Process input files,

Basic package,

Time-Variant Specified-Head package

Flow and Head Boundary package

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Input instructions

Input for the Specified-Head Flow Observation input file is read from a file that is specified with "CHOB" as the file type listed 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:

NQCH NQCCH NQTCH (free format)

MODFLOW-2005:

NQCH NQCCH NQTCH IUCHOBSV [NOPRINT] (free format)

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

NQCH NQCCH NQTCH IUCHOBSV (free format)

Data Set 2

MODFLOW-2000:

TOMULTCH  EVFCH IOWTQCH (free format)

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

TOMULTCH (free format)

Read items 3, 4, and 5 for each of NQCH groups of cells for which constant-head flow observations are to be specified.

Data Set 3

NQOBCH NQCLCH (free format)

Data Set 4

MODFLOW-2000:

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

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

OBSNAM IREFSP TOFFSET FLWOBS (free format)

Read item 4 for each of NQOBCH observation times for this group of cells. STATISTIC and STAT-FLAG are ignored if IOWTQCH is greater than zero.

Data Set 5

LAYER ROW COLUMN FACTOR (free format)

Read item 5 for each of |NQCLCH| cells in this group.

Read items 6 and 7 if IOWTQCH is greater than 0. Items 6 and 7 are only available in MODFLOW-2000.

Data Set 6

FMTIN IPRN (free format)

 

Data Set 7

WTQ(1,1), WTQ(1,2), WTQ(1,3), ... , WTQ(1,NQTCH) (format: FMTIN)

WTQ(2,1), WTQ(2,2), WTQ(2,3), ... , WTQ(2,NQTCH)

...

WTQ(NQTCH,1), WTQ(NQTCH,2), WTQ(NQTCH,3), ... , WTQ(NQTCH,NQTCH)

 

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