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Online Guide to MODFLOW

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MNWI - Multi-Node Well Information Package

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Abbreviation in Name file

MNWi

Purpose

Data calculated for multi-node wells can be recorded at every time increment using the MNWI Package.

Documentation

Konikow, L.F., Hornberger, G.Z., Halford, K.J., and Hanson, R.T., 2009, Revised multi-node well (MNW2) package for MODFLOW ground-water flow model: U.S. Geological Survey Techniques and Methods 6–A30, 67 p.

Related Packages

MNW2 package

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

MNWI is designed to work with both MODFLOW-2000 and MODFLOW-2005 but the released version of MODFLOW-2000 does not include MNWI.

MODFLOW Name File

The user can optionally specify that information calculated for specific multi-node wells are to be written to separate output files by including a record in the MODFLOW name file using the file type (Ftype) “MNWI” that specifies the relevant input data file giving selected well locations. The MNW2 and MNWI Packages are compatible with MODFLOW–2000 (Harbaugh and others, 2000) and MODFLOW–2005 (Harbaugh, 2005) and with compatible versions of the groundwater transport process, but not with earlier versions of MODFLOW.

Multi-Node Well Information (MNWI) Package

Data calculated for multi-node wells can be recorded at every time increment using the MNWI Package. The specific nature of the recorded and written information depends on the selection of a number of options, as described below. Some options will save specific types of information for all multi-node wells to a single file, and other options will save certain information about an individual multi-node well to a single file. These output options can facilitate graphical postprocessing of the calculated data. The input file is read if the file type (Ftype) “MNWI” is included in the MODFLOW name file, and MNWI should only be used if the MNW2 Package is active.

In the following description, input parameters are indicated as being optional by their enclosure in curly brackets. All input data are read using free formats.

FOR EACH SIMULATION:

Data Set 1

WEL1flag QSUMflag BYNDflag

Data Set 2

Number of multi-node wells for which detailed flow, head, and (if the GWT process is active) solute data are to be saved in a separate file for each multi-node well. MNWOBS must be 0.

IF MNWOBS > 0, THEN FOR EACH MULTI-NODE WELL TO BE MONITORED:

Data Set 3

WELLID UNIT QNDflag QBHflag [CONCflag]

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