KDEP - Hydraulic-Conductivity Depth-Dependence Capability

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Abbreviation in Name file

KDEP

Purpose

Hydraulic-Conductivity Depth-Dependence Capability allow the horizontal hydraulic conductivity of hydrogeologic units to vary with depth using an exponential decay function. The vertical hydraulic conductivity changes accordingly if specified using vertical-anisotropy (VANI) parameters.

Documentation

Anderman, E.R., and Hill, M.C., 2003, MODFLOW-2000, the U.S. Geological Survey modular ground-water model -- Three additions to the Hydrogeologic-Unit Flow (HUF) Package: Alternative storage for the uppermost active cells, Flows in hydrogeologic units, and the Hydraulic-conductivity depth-dependence (KDEP) capability: U.S. Geological Survey Open-File Report 03-347, 36 p.

Supported in

MODFLOW-2000

MODFLOW-2005

MODFLOW-LGR

MODFLOW-NWT

MODFLOW-OWHM

Other Notes

The "Hydraulic-Conductivity Depth-Dependence" capability is provided in the KDEP input file but is part of the Hydrogeologic-Unit Flow package (HUF2).

The depth-dependence capability is a modification to the existing HUF Package (Anderman and Hill, 2000). This section describes the new input file needed with the depth-dependence capability and the changes in the HUF Package output files resulting from using the depth-dependence capability. There are no changes in the HUF Package output files if the depth-dependence capability is not used.

Input Instructions

Input for the Hydraulic-Conductivity Depth-Dependence capability is read from the file that has type “KDEP” in the Name file. Free format is used for reading all values.

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

NPKDEP IFKDEP

Data Set 2

RS(NCOL,NROW)- U2DREL

Include Item 2 only if IFKDEP is greater than 0. Item 2 is read using the array-reading utility module U2DREL (Harbaugh and others, 2000, p. 86-88).

Repeat Items 3 and 4 for each parameter to be defined (that is, NPKDEP times).

Data Set 3

PARNAM PARTYP Parval NCLU

Data Set 4

HGUNAM Mltarr Zonarr IZ

Each Item 4 record is called a parameter cluster. Repeat Item 4 NCLU times.