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Online Guide to MODFLOW-NWT

Abbreviation in Name file

DRT

Purpose

The Drain Return Package allows simulation of drains in which some of the water from the drain is used to recharge the aquifer.

Documentation

Banta, E.R., 2000, MODFLOW-2000, the U.S. Geological Survey Modular Ground-Water Model - Documentation of Packages for Simulating Evapotranspiration with a Segmented Function (ETS1) and Drains with Return Flow (DRT1): U.S. Geological Survey Open-File Report 00-466, 127 p.

Time-varying-parameters.pdf

release.txt

modpath.txt

Hanson, R.T., Boyce, S.E., Schmid, Wolfgang, Hughes, J.D., Mehl, S.M., Leake, S.A., Maddock, Thomas, III, and Niswonger, R.G., 2014, One-Water Hydrologic Flow Model (MODFLOW-OWHM): U.S. Geological Survey Techniques and Methods 6–A51, 120 p., http://dx.doi.org/10.3133/tm6A51.

Related Packages

Head-Dependent Flux Boundary packages

Drain package

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-CFP

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

The Drain-Return Observation Package (DTOB) is not included in MODFLOW-2005 or MODFLOW-LGR

Input Instructions

Input to the DRT1 Package is read from the file that has type “DRT” 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 as many times as desired.

Data Set 1

MXADRT IDRTCB NPDRT MXL [Option]

Repeat Items 2 and 3 for each parameter to be defined (that is, NPDRT times). Items 2 and 3 are omitted if NPDRT = 0.

Data Set 2

[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 3a

INSTNAM

Item 3a is read only if PARNAM is time-varying. NUMINST repetitions of Item 3 (parts a and b) are read. After each repetition of Item 3a, NLST repetitions of Item 3b are read.

Data Set 3b

Layer Row Column Elevation  Condfact [LayR RowR ColR Rfprop] [xyz]

NLST repetitions of Item 3b records are required; they are read by module ULSTRD (Harbaugh and others, 2000). (SFAC of the ULSTRD utility module applies to Condfact.) The NLST repetitions of Item 3b follow each repetition of Item 3a when PARNAM is time-varying.

FOR EACH STRESS PERIOD

Data Set 4

ITMP NP

Data Set 5

Layer Row Column Elevation Cond [LayR RowR ColR Rfprop] [xyz]

ITMP repetitions of Item 5 records are read by module ULSTRD (Harbaugh and others, 2000) if ITMP > 0. (SFAC of the ULSTRD utility module applies to Cond). Item 5 is not read if ITMP ≤0.

Data Set 6

Pname [Iname]

Item 6 is repeated NP times. It is not read if NP ≤0. Iname is read if Pname is a time-varying parameter.

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