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Navigation: Online Guide to MODFLOW > Groundwater Flow Process > Solvers

SIP - Strongly Implicit Procedure Package

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Abbreviation in Name file

SIP

Purpose

The Strongly Implicit Procedure package is used to solve the finite difference equations in each step of a MODFLOW stress period.

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

Related Packages

Solvers

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

If the Lake package is used, more iterations may be required.

Input Instructions

Input to the Strongly Implicit Procedure (SIP) Package is read from the file that is type "SIP" in the name file. All numeric variables are free format if the option “FREE” is specified in the Basic Package input file; otherwise, all the variables have 10-character fields.

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

MXITER NPARM

Data Set 2

ACCL HCLOSE IPCALC WSEED IPRSIP