Open-File Report 2006–1104

U.S. GEOLOGICAL SURVEY
Open-File Report 2006–1104

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Table 4. Sensitivity Process and associated factors for Constant-Head Boundary, Drain, Horizontal-Flow Barrier, and Recharge Packages.

[Abbreviations: CHD, Constant-Head Boundary Package; DRN, Drain Package; HFB6, Horizontal-Flow Barrier Package; RCH, Recharge Package; SEN, Sensitivity Process; MULT, multiplier file. NA, not applicable. m/d, meter per day; (m/d)/m, meter per day per meter; m, meter]

Package Parameter Type Factor variable Units of the
parameter value in
the SEN Process		 Comment
CHD Hydraulic head (m) Shdfact1 = Ehdfact2 NA3 Head is the product of Ehdfact2 and the parameter value in the SEN Process.
DRN Drain conductance [(m/d)/m] Condfact4 Hydraulic conductance [(m/d)/m] Drain hydraulic conductance5 is the product of Condfact and the parameter value in the SEN Process.
HFB6 Fault hydraulic characteristic [(m/d)/m] Factor = 1.0 Hydraulic conductivity (m/d) Hydraulic characteristic is the product of Factor and the parameter value in the SEN Process.
RCH Recharge flux (m/d) NA Unitless multiplier Parameter value in the SEN Process is multiplied by the multiplier array6 value at each cell.

1Shdfact is the factor used to calculate the head at the boundary at the start of the stress period.

2Ehdfact is the factor used to calculate the head at the boundary at the end of the stress period.

3No CHD parameters are defined in the SEN Process. CHD parameters are defined only in the CHD Package. This is effectively a parameter value of1.0.

4In the DVRFS model, the value of Condfact is the fractional area of a cell that the drain parameter occupies.

5Hydraulic characteristic is the barrier hydraulic conductivity divided by the width of the barrier. In the DVRFS model, the width of all barriers is assumed to be 1.0 meter; consequently, the hydraulic characteristic and the hydraulic conductivity are numerically equivalent.

6The multiplier array file is rch1_modmd.asc as specified in the MULT file (mult.txt).

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