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Online Guide to MODFLOW

Navigation: Observation Process

DROB - Drain Observation Package

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Abbreviation in Name file

DROB

Purpose

The Drain Observation input file is used to specify observations of flow through Drain 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,

Drain package

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

The Drain package must be used in models in which the Drain Observation input file is used.

Input Instructions

Input for the Drain Observation input file is read from a file that is specified with "DROB" 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:

NQDR NQCDR NQTDR (free format)

MODFLOW-2005:

NQDR NQCDR NQTDR IUDROBSV [NOPRINT] (free format)

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

NQDR NQCDR NQTDR IUDROBSV (free format)

Data Set 2

MODFLOW-2000:

TOMULTDR  EVFDR IOWTQDR (free format)

MODFLOW-2005 and models derived from it:

TOMULTDR (free format)

Read items 3, 4, and 5 for each of NQDR groups of cells for which drain observations are to be specified.

Data Set 3

NQOBDR NQCLDR (free format)

Data Set 4

MODFLOW-2000:

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

MODFLOW-2005 and models derived from it:

OBSNAM IREFSP TOFFSET FLWOBS (free format)

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

Data Set 5

Layer Row Column Factor (free format)

Read item 5 for each cell in this group; the number of cells equals the absolute value of NQCLDR from item 3.

Read items 6 and 7 if IOWTQDR 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,NQTDR) (format: FMTIN)

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

...

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

 

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