Specifies the soil stiffness in the downward direction on a stiffness per length basis. The value that you enter is the stiffness that will resist downward (-Y) displacement of the pipeline. This option is required if Soil Model No. is set to 1; otherwise, you can leave this option blank.
The smallest allowable non-zero value is 0.5.
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If the upward and downward stiffnesses are equal, then you need only enter a value for one. The other stiffness defaults to the entered value.
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If both User-Defined Upward Stif and User-Defined Downward Stif are set to 0 or left blank, the software returns a fatal error.