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Online Guide to MODFLOW-NWT

Abbreviation in Name file

RIV

Purpose

The River package is used to simulate head-dependent flux boundaries.  In the River package if the head in the cell falls below a certain threshold, the flux from the river to the model cell is set to a specified lower bound.

Documentation

Harbaugh, A.W., Banta, E.R., Hill, M.C., and McDonald, M.G., 2000, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- User guide to modularization concepts and the Ground-Water Flow Process: U.S. Geological Survey Open-File Report 00-92, 121 p.

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://doi.org/10.3133/tm6A16

Time-varying-parameters.pdf

release.txt

modpath.txt

Related Packages

Head-Dependent Flux Boundary packages

River Observation package

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

Special care must be taken when constructing the RIV package input file if the observations are used.  See discussion of "Observations at Cells Having More Than One Head-Dependent Boundary Feature Represented by the Same Package" in the RVOB input file.

Input Instructions

Input to the River (RIV) Package is read from the file that has file type "RIV" in the name file. Optional variables are shown in brackets. All variables are free format if the option “FREE” is specified in the Basic Package input file; otherwise, the non-optional variables have 10-character fields and the optional variables are 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.

Data Set 1

[ PARAMETER NPRIV MXL]

This optional item must start with the word “PARAMETER”.

Data Set 2

MXACTR IRIVCB [Option]

Repeat Items 3 and 4 for each NPRIV parameter.

Data Set 3

[PARNAM PARTYP Parval NLST [INSTANCES  NUMINST]]

If PARNAM is to be a time-varying parameter, the keyword “INSTANCES” and a value for NUMINST must be entered.

Data Set 4a

[INSTNAM]

Item 4a is read only if PARNAM is time-varying. NUMINST repetitions of Item 4 (parts a and b) are read. After each repetition of Item 4a, NLST repetitions of Item 4b are read.

Data Set 4b

Layer Row Column Stage  Condfact Rbot [xyz]

NLST repetitions of Item 4b are required; they are read by module ULSTRD. (SFAC of the ULSTRD utility module applies to Condfact). The NLST repetitions of Item 4b follow each repetition of Item 4a when PARNAM is time-varying.

FOR EACH STRESS PERIOD

Data Set 5

ITMP NP

Data Set 6

Layer Row Column Stage  Cond Rbot [xyz]

ITMP repetitions of Item 6 are read by module ULSTRD if ITMP > 0. (SFAC of the ULSTRD utility module applies to Cond.) Item 6 is not read if ITMP is negative or 0.

Data Set 7

[Pname [Iname]]

Item 7 is repeated NP times. It is not read if NP is negative or 0. Iname is read if Pname is a time-varying parameter.

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